Answer:
It is water vapor.
Explanation:
When water boils, it is changing state from a liquid to a gas.
Answer: It is water vapor. When water boils, it is changing state from a liquid to a gas.
Explanation:
f1=30Nandf2=10Nact on amass of 2kg if the cofficient of friction between the mass and the horizontal surface is 0.2 what is the acceleration of the mass
The mass is moving with an acceleration of 13.299 m/s².
What is the straight forward meaning of acceleration?The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations.
According to therefore mentioned statement,
the direction of the net force applied on an object determines its acceleration;
according to mentioned data;
F₁=30N
F₂=10N
Net force on object;
F=F₁+F₂
F=F₁y+F₂Cos30°(-x)+F₂ Sinx(-y)
F=3y+10×(√3/2)(-x)+10×(1/2)(-y)
F=ma
ma=-5√3/2(x)+25y
2a=-5√3x/2+25y
a=-5√3x+25y
magnitude(a)=√(-5√3/2)²+(25/2)²
(a) =13.299m/s²
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Which statement about the accuracy and precision of measuring tools is true
Answer;
1. Accuracy is the closeness with which an instrument approaches the true value of the quantity being measured
2. Precision is a measure of the reproducibility of the measurement
3. Accuracy may be specified in terms of limits of errors.
The more exercise a person takes the fewer medical problems they report. This is an example of:
O A. statistical independence.
B. a positive correlation.
O C. a negative correlation.
D. a curvilinear relationship
Answer:
The best answer seems to be B because there is a strong positive correlation that the more exercise a person does, the fewer medical problems they have
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!
The more exercise a person takes the fewer medical problems they report. This is an example of a positive correlation. The correct option is B.
What is positive correlation?When two variables rise or decrease simultaneously, there is a positive correlation; when there is a negative correlation, one variable increases as the other falls.
When two variables behave in unison, rising or falling in lockstep with one another, there is a positive correlation.
When two variables move in opposition to one another—that is, when one rises, the other falls—this is known as a negative correlation.
A person reports fewer medical issues the more activity they get. An illustration of a positive correlation would be this.
Thus, the correct option is B.
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Which of the following branches studies the particles moving at any speed,
including very high speeds.
A. Optics
B. Thermodynamics
C. Astrophysics and Cosmology
D. Relativity
The correct answer is option D. That is, the branch of Physics that study the particles movement at any speed, including very high speeds is Relativity
Difference between Kinematic and Dynamics
Kinematic is a branch of Physics that deal with a study of particle's motion without considering the cause of the motion. While dynamics deals with the motion of a particle as well as the causes of the motion.
The branch of Physics that study the particles movement at any speed,
including very high speeds is Relativity.
We have relativity of mass, relativity of time and relativity of length. All deal with the speed of light which is the fastest speed on earth as of now.
Therefore, the correct answer is option D. That is, the branch of Physics that study the particles movement at any speed, including very high speeds is Relativity.
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2. How long will it take for a bicycle to travel across from point A to
point D as shown below in the figure if his velocity was 4 m/s. Hint: use
Pythagorean Theorem () to find your displacement. A²+ B² = (²
A
25m
B
25m
D
35m
C
V = & Devt T=B
Answer:
I guess equal to ABD
Can you give me the reference frame for every one of these please.
The sun rises over the horizon.
A bus moves past people standing on the sidewalk.
A passenger on that same bus sees a ball roll down the aisle.
Two trains traveling at the same speed on parallel tracks race past passengers who are waiting on a local station's platform.
A passenger on one of those trains looks out the window and sees the other train standing still.
A person standing near a railroad track sees a train pass by, then notices an airplane fly overhead in the same direction as the train, but at a much faster speed.
A passenger in that airplane looks down and sees the train moving backward.
A passenger in that airplane looks across the aisle and sees a child tossing a ball up and down.
A bus moves past people standing on the sidewalk, reference frame is people on the sidewalk.A passenger on that same bus sees a ball roll down the aisle, reference frame is the train aisle.
Two trains traveling at the same speed on parallel tracks race past passengers who are waiting on a local station's platform, reference frame is the station's platform.
A passenger on one of those trains looks out the window and sees the other train standing still, reference frame is the other train standing still.
A person standing near a railroad track sees a train pass by, then notices an airplane fly overhead in the same direction as the train, but at a much faster speed, reference frame is railroad track.A passenger in that airplane looks down and sees the train moving backward, reference frame is inside of the airplane.A passenger in that airplane looks across the aisle and sees a child tossing a ball up and down, reference frame is the aisle.
What is reference frame?
Reference frame can be described as the stationary background to which an object is compared to tell if it is moving.
A frame of reference is therefore a purely kinematical device, for the geometrical description of motion without regard to the masses or forces causing the motion.
The instance we discussed had different reference frames all of which are the stationary background of the objects.
In conclusion, reference frame of an object describes the motion without regard to the forces causing the motion.
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A ball dropped from a window strikes the ground 2.71 seconds later. How high is the window above the ground?
[tex]s=36.52m[/tex]
Given ,
Time =2.71 second
We apply the formula
[tex]s=ut+12at^2[/tex]
[tex]u=0,t=2.73 \\a=g \\So, the \\height \\ s=36.52m[/tex]
When a body is lying on a horizontal surface, the object is subjected to a downward force due to the action of gravity. These gravitational forces always aim to attract the item, confirming the force's nature as an attractive force. Consider an object of mass "M" resting on a horizontal surface; the force exerted to the object by gravity is equal to the weight of the object "W." The acceleration owing to gravity, indicated as "g," is the acceleration by which an object is drawn towards the ground. As a result, Newton's second law states that when the values in the above connection are substituted.
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You are conducting an experiment inside a train car that may move along level rail tracks. A load is hung from the ceiling on a string. The load is not swinging, and the string is observed to make a constant angle of 10∘ with the vertical. No forces are acting on the load. Which of the following statements are correct?
Select all 3 that apply.
a. The train is an inertial frame of reference
b. The train is not an inertial frame of reference
c. The train may be instantaneously at rest
d. The train may be moving at a constant speed in a straight line
e. The train may be moving at a constant speed in a circle
f. The train must be speeding up
The train is not an inertial frame of reference, and the train may be moving at a constant speed in a straight line or the train may be instantaneously at rest.
What is uniform speed and Acceleration?The pace at which an object's position changes about relation to a frame of reference and time is known as its velocity.
Uniform velocity is the state in which a body travels the same distance in the same amount of time. When the amplitude and direction of a body's average velocity (v) over time (t) do not change over time, the body is said to be moving at a uniform velocity. An illustration of uniform motion is the moon's orbit around the earth.
As the rate of change of velocity, acceleration is an illustration of a vector quantity.
When an item is moving in a straight path with an increase in velocity occurring at regular intervals of time, it is said to be experiencing uniform acceleration. The uniform acceleration of an object during free fall is one example.
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Which of these objects could be falling with constant acceleration?
Object 1 and Object 2 will have a constant acceleration.
We know the expression for Displacement, Acceleration, and Time can be represented by the equation: S = ut + 1/2at². We will compare cases for each object at a given position and time and check if the object maintains a constant acceleration.
=> S = ut +1/2at², where S = Displacement/position of object, u = Initial velocity, t = time, a = acceleration.
For Object 1,
Case 1 : 0.44 = 0*0.3 + 1/2*a*(0.3)²
a = 9.78
Case 2 : 3.14 = 0*0.08 + 1/2*a*(0.8)²
a = 9.81
Acceleration is approximately constant for object 1.
For Object 2:
Case 1 : 0.06 = (0) (0.3) + ½ a (0.3)²
a = 1.33
Case 2: 3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
Acceleration is approximately constant for object 2.
For Object 3:
Case 1 : 0.44 = (0) (0.3) + ½ a (0.3)²
a = 9.78
Case 2: 3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
Acceleration has a lot of differences in both cases of Object 3 so it's not constant.
Hence, Object 1 and Object 2 have constant acceleration.
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scoliosis is a common disease of the spine where the spine is not straight but forma an S or C shape while viewing a patients from the front
The correct answer is Scoliosis is a spine curvature that occurs most frequently in adolescents.
Scoliosis is a spine curvature that occurs most frequently in adolescents.The most commonly used brace is made of plastic and contoured to fit the body. Because it fits under the arms and around the rib cage, lower back, and hips, this brace is almost invisible under clothing.
The majority of braces are worn between 13 and 16 hours per day. Idiopathic, congenital, and neuromuscular conditions The most common type of scoliosis is idiopathic. This means that the cause is unknown or that no single factor contributes to the disease's development.Scoliosis can improve with treatment, but it is not always a sign of something serious, and it is not always necessary if it is mild.
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Fan B has an efficiency of 55% and usefully transfers 10J of energy to its kinetic energy store each second. Calculate how much energy is supplied to fan B per second
Fan B has an efficiency of 55% and usefully transfers 10J of energy to its kinetic energy store each second. 18.18 J of energy is supplied to fan B per second.
What definition of effectiveness is the best?Efficiency is the capacity to do a task with little or no wastage, effort, or energy. Being effective is maximizing the use of the resources at your disposal to achieve your objectives. Simply put, something is efficient if there is no waste and every process is optimized.
To calculate the input energy use the following formula
Efficiency = Energy(out) / Energy(in) * 100%
Efficiency = 55%
Energy(out) = 10J
Energy(in) = ?
On putting the given values we get,
55 = Energy(in) / 10 * 100%
On solving we get,
Energy(in) = 18.18J
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what is the total moved without regard to direction
The entire motion of an object, regardless of direction.
In physics, motion is that the phenomenon in which an object changes its position with respect to time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and frame of regard to an observer and measuring the change in position of the body relative to that frame with change in time. The branch of physics describing the motion of objects without regard to their cause is called kinematics, while the branch studying forces and their effect on motion are named dynamics.
If an object isn't changing relative to a given frame of reference, the thing is said to be at rest, motionless, immobile, stationary, or to possess a constant or time-invariant position with reference to its surroundings. Modern physics holds that, as there's no absolute frame of reference, Newton's concept of absolute motion can't be determined
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M
An 80% furnace's discharge air temperature is 125 degrees F and is adding heat to a space at the rate of 80,000 BTU's an hour. What is the input rating of the furnace?
a. 60,000 Btu's
b. 120,000 Btu's
c. 75,000 Btu's
d. 100,000 Btu’s
D. The input rating of the furnace is determined as 100,000 BTU.
What is input rating?
Input power rating means the power, expressed in Watts or one of its multiples, for which the energy storage unit has been designed to operate at nominal conditions.
eff = (output rating / input rating) x 100%
80/100 = 80,000 BTU / input rating
0.8 = 80,000 BTU / input rating
input rating = 80,000 BTU/0.8
input rating = 100,000 BTU
Thus, the input rating of the furnace is determined as 100,000 BTU.
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A ruler is knocked off the end of a desk with a horizontal velocity of 1.2ms-1. If the desktop is 0.8m above the floor then calculate:
a) the resultant velocity of the ruler when it hits the floor?
b) the horizontal displacement of the ruler?
If a ruler is knocked off the end of a desk with a horizontal velocity of 1.2ms-1. If the desktop is 0.8m above the floor then the resultant velocity of the ruler would be 4.13 meters/seconds.
What is a projectile motion?It can be defined as the motion of any object or body when thrown from the earth's surface and follows any curved path under the effect of the gravitational force of the earth.
The final velocity of the ruler can be calculated with the help of the third equation of motion in the vertical direction under the influence of gravity,
v² - u² = 2as
v = √(2gh)
=√2*9.81*0.8
= 3.96 m/s
The resultant velocity of the ruler = √(3.96² + 1.2²)
=4.13 meters / seconds
Time is taken to hit the ground = 3.96 / 9.81
=0.4036 seconds
The horizontal displacement of the ruler = 1.2*0.4036
=0.48432 meters
Thus, the resultant velocity of the ruler would be 4.13 meters/seconds.
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True or false - The vector for a negative acceleration points in the opposite direction when
compared to the vector for a positive acceleration.
Explanation:
the ratio between two circles vqjoizxcvu g çm
5. You are concentrating on an exam, deciding between two answers that could possibility be right
for one of the questions. What part of the brain is activated during this task?
a. Temporal lobe
b. Occipital lobe
C.
Parietal lobe
d. Prefrontal cortex
Answer: D. prefrontal cortex
Explanation: The Prefrontal Cortex (PFC) and hippocampus are the most critical parts of the human brain for decision making
part 1 of 2
A runner is jogging in a straight line at a
steady u, 2.2 km/hr. When the runner is
L 4 km from the finish line, a bird begins
flying straight from the runner to the finish
line at v= 6.6 km/hr (3 times as fast as the
runner). When the bird reaches the finish
line, it turns around and flies directly back to
the runner.
24
finish
line
L
What cumulative distance does the bird
travel? Even though the bird is a dodo, as-
sume that it occupies only one point in space
(a "zero" length bird), travels in a straight
line, and that it can turn without loss of
speed.
Answer in units of km.
Answer in units of km
After the given information and solving it the cumulative distance the bird travel is 6 km.
Equation :The given parameters of the motion are;
The velocity of the runner,
vr = 2.2 km/hr
The distance from the finish line and the bird begins to fly from the runner to the finish line,
L = 4 km
The direction and speed of the runner = 6.6 km/hr in a straight line to the finish line and back to the runner
The speed of the bird = 4 × The speed of the runner
Given,
The length of the bird = 0
The bird turns without loss of speed
The time it takes the bird to reach the finish line,
t₁ = 4 km / (6.6 km/hr) = 0.606 hr
The distance the runner runs in time t₁,
d = 2.2 km/hr × 0.606 hr
d = 1.3332 km
The distance runner and bird combined travel before they meet,
X, is given as follows;
X = L - d
X = 4 km - 1.3332 km
X = 2.667 km
We get; X = (vr + vb) x t
Which gives;
2.667 = ( 2.2 + 6.6) × t
t = 2.667/( 2.2 + 6.6 )
t = 2.667/(8.8)
t = 0.303
The time it take for the bird and the runner to meet,
t = 0.303 hour
The distance the bird travels before reaching the runner,
d₂ = vb x t
So,
d₂ = 6.6 km/hr × 0.303 hr = 2 km
The cumulative distance the bird travels dt = L + d2
dt = 4 km + 2km
dt = 6 km
The cumulative distance the bird travels by the time it reaches the runner dt = 6 km
Alternatively, we have;
db = d₁ + d₃
dr = d₂
d₁ + d₃ + d₂ = 2·L
So, dr + db = 2·L
dr = The distance runner runs before meeting with the bird
db = The distance bird travels before meeting with the runner
db = 4dr
So,
dr + db = 3 × 4 = 12
dr + 4· dr = 4 · dr = 12
dr = 12 /4 = 3
db =3 × dr
db = 3 × 2
db = 6 km
The distance bird travels before meeting with the runner,
db = 6 km
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76. Two electric charges -6μC and
+6μC are placed respectively in two
points A and B distant of 1m apart. The
electric field is null at the point C:
A.Located in the middle of the
segment AB
B.Located outside segment AB at
1m from A.
C.Located outside segment AB at
1m from B
D.Outside the line AB
E.No answer is right.
A. The electric field is null at the point C; located in the middle of the
segment AB.
What is electric field?Electric field is the region of space where the influence of electric force is felt.
Electric field at the middle of ABE = kq/r²
where;
r is the middle of AB = 0.5 mE(+6μC) = (9 x 10⁹ x 6 x 10⁻⁶) / (0.5²)
E(+6μC) = +216,000
E(-6μC) = (9 x 10⁹ x 6 x 10⁻⁶) / (0.5²)
E(-6μC) = -216,000
Sum of the electric field at the middle of ABE(net) = E(+6μC) + E(-6μC)
E(net) = 216,000 - 216,000 = 0
Thus, the electric field is null at the point C; located in the middle of the
segment AB.
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On an electrolytic or paper capacitor, what does the black band indicate?
A. That the capacitor's negative lead is near the band
B. That the capacitor's voltage rating is less than 100 VDC
C. That the capacitor is color-coded to military specifications
D. That the capacitor has a value less than 10 mF
C. On an electrolytic or paper capacitor, the black band indicate that the capacitor is color-coded to military specifications.
What is paper capacitor?Paper Capacitor is a fixed capacitor in which flat thin strips of metal foil, usually aluminium is separated by dielectric material paper.
Paper capacitor is used in electronic noise filtering, signal coupling and decoupling systems, and remote sensing systems.
What does the black band indicate in paper capacitor?The coloured bands represent the capacitance value as per the colour code. That is the capacitor is color-coded to specifications.
The black band usually indicate the specification of the capacitor.
Thus, on an electrolytic or paper capacitor, the black band indicate that the capacitor is color-coded to military specifications.
So the correct option is C.
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A ship sets sail with an initial velocity of 20 m/s and a constant
acceleration of 5 m/s2. What's the ship's velocity after a half
minute (in m/s)?
The ship's velocity after a half minute (in m/s) is 170 m/s
What is acceleration?This is defined as the rate of change of velocity which time. It is expressed as
a = (v – u) / t
Where
a is the acceleration v is the final velocity u is the initial velocity t is the time How to determine the velocity after half minuteInitial velocity (u) = 20 m/sTime (t) = 1/2 minute = 0.5 minute = 0.5 × 60 = 30 sAcceleration (a) = 5 m/s² Final velocity (v) = ?The final velocity can be obtained as illustrated below:
5 = (v – 20) / 30
Cross multiply
v – 20 = 5 × 30
v – 20 = 150
Collect like terms
v = 150 + 20
v = 170 m/s
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A string applies an upward (tension) force of 34 N to lift a bucket of mass 2.8 kg. What is
the acceleration of the bucket? (Answer in m/s²)
The acceleration of the bucket of mass 2.8 kg which is lifted upwards with a force of 34 N is 12.14 m / s²
According to Newton's second law of motion,
F = m a
F = Force
m = Mass
a = Acceleration
F = 34 N
m = 2.8 kg
a = F / m
a = 34 / 2.8
a = 12.14 m / s²
Acceleration is the rate of change of velocity of an object with respect to time. It is denoted as a.
Therefore, the acceleration of the bucket is 12.14 m / s²
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Please help with this problem!
The horizontal displacement of the backpack as it falls is 765 m.
Data obtained from the questionFrom the question given above, the following data were obtained:
Initial velocity (u) = 85 m/sAcceleration due to gravity (g) = 9.8 m/s²Time (t) = 9 sHorizontal displacement (s) =?How to determine the horizontaal displacementThe horizontal displacement of the backpack can be obtained as follow:
s = ut
s = 85 × 9
Horizontal displacement = 765 m
From the calculation made above, we can see that the horizontal displacement (i.e distance from the car) were the backpack will land is 765 m. Thus, the backpack will not land on your car. Hence, you do not need to move the car.
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what type of force os your answer in number 4?
The electromagnetic force, the weak nuclear force, the strong nuclear force, and gravity.
The strong force, weak force, electromagnetic force, and gravitational force are the four fundamental forces operating in the universe. They each operate within different parameters and have unique strengths. Although gravity has an infinite range, it is the weakest force. Although it has an infinite range, the electromagnetic force is much stronger than gravity. The weak and strong forces are dominant only at the level of subatomic particles and are only effective over very small distances. Even though it has a weaker name than gravity, the weak force is actually the weakest of the three. The strongest of the four fundamental interactions is the strong force, as its name suggests.
Actually, out of the four fundamental forces, gravity is the weakest. The four forces are the electromagnetic force, gravity, the weak nuclear force, and the strong nuclear force, in that order.
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If Sandy moves rightward 10 meters, what is true about her displacement?
Her displacement is zero.
O Her displacement is positive.
Her displacement negative.
One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 2.97 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? (b) What is the magnitude of the couple’s displacement? (c) What is the direction (relative to due east) of the couple’s displacement?
The distance they travel is 4.85 km. the magnitude of the couple’s displacement is 1.456 km. The displacement vector is 315 degrees counterclockwise in relation to the east.
The total distance traveled is the overall distance traveled during the entire excursion. However, the displacement is the net distance traveled between the starting location and the final position. Displacement cannot exceed distance in any way. An element of a vector is the displacement. It is a scalar quantity, the distance.
The couple circles a circular lake on foot about 3/4 of the way.
The circle has a radius of r = 1.03 km, or 1030 meters.
The couple's journey begins at point A and ends at point D by taking the path ABCD.
The journey's distance is calculated as follows:
d = 0.75*2*3.14*1.03*d
=4.85 km
The net distance between points A and D is the displacement's magnitude. |d| = |AD|=|r2+r2
= 21.03/2
=1.456 km
The displacement vector is 315 degrees counterclockwise in relation to the east.
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In a longitudinal wave, the medium moves
left to right
up and down
in circles
In a longitudinal wave, the particles of the medium have to and fro motion about their mean motion, along the direction of wave motion.
Longitudinal waves are waves in which the displacement of the medium is in the same (or the opposite) direction as the wave propagation and the medium vibration is parallel ("along") to the direction the wave travels. Because they create compression and rarefaction when passing through a material, mechanical longitudinal waves are also known as compressional or compression waves. A nice illustration is a wave down the length of a stretched Slinky toy, where the space between the coils grows and shrinks. Examples from the real world include seismic P-waves and sound waves (which are oscillations in pressure, a particle's displacement, and a particle's velocity) (created by earthquakes and explosions).
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Do the following calculation and express the final answer in
proper scientific notation with the correct number of
significant digits:
(2.3 × 10^-3)(5.880 × 10^4) + 8.44
Answer:
x 10
I did the calculations and got 143.68. Since there’s multiplication I thought the number of sig figs would be 2 since 2.3 x 10^-3 has 2 sig figs. And I rounded the output to 14 and input 1.4 x 10^1 as the answer but got it wrong.
Answer:
Explanation:
I got the same thing. So, i don't know but good luck
Is it possible for an object to be accelerating and at rest at the same time? Explain.
Answer:
Yes
Explanation:
acceleration is a change in velocity, so an object might be momentarily at rest but a split-second later have some speed, i.e. it can be changing its velocity even if it is momentarily at rest.
An object with a mass of 20 kg has a het force of 80 N acting on it. What is the acceleration of the object?
Explanation:
f=ma
a=f/m
a=80/20 = 4m/s
Which combination of atoms form covalent bonds?
nonmetals & metals
metals only
nonmetals only
none of these
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