Which is true about mass and weight?

Mass depends on location, weight is the same everywhere.

Mass and weight are the same thing.

Objects dropped in a vacuum (no air) will fall at different rates because they have different weights.

Mass is measured with a spring scale.

Mass must be in kg and weight in N to do our calculations.

Explanation:

f=ma

a=f/m

a=80/20 = 4m/s

[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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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. 18.18 J of energy is supplied to fan B per second.

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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D. The input rating of the furnace is determined as 100,000 BTU.

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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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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The mass is moving with an acceleration of 13.299 m/s².

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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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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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.

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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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.

A. The electric field is null at the point C; located in the middle of the

segment AB.

Electric field is the region of space where the influence of electric force is felt.

E = kq/r²

where;

E(+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

E(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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The horizontal displacement of the backpack as it falls is 765 m.

From the question given above, the following data were obtained:

The 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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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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The ship's velocity after a half minute (in m/s) is 170 m/s

This is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

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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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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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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Answer: D. prefrontal cortex

Explanation: The Prefrontal Cortex (PFC) and hippocampus are the most critical parts of the human brain for decision making

Answer:

Explanation:

I got the same thing. So, i don't know but good luck

After the given information and solving it the cumulative distance the bird travel is 6 km.

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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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

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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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 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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C. On an electrolytic or paper capacitor, the black band indicate that the capacitor is color-coded to military specifications.

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.

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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Explanation:

the ratio between two circles vqjoizxcvu g çm

The y component of the vector is 37.7 N and the angle between the vectors is 26.2⁰.

The y component of the vector will be determined from the resultant vector and the x component of the vector.

R² = Y² + X²

Y² = R² - X²

Where;

Y² = 85.2² - 76.4²

Y² = 1,422.08

Y = √1,422.08

Y = 37.7 N

θ = arc tan (Y/X)

θ = arc tan (37.7/76.4)

θ = 26.2⁰

Thus, the y component of the vector is 37.7 N and the angle between the vectors is 26.2⁰.

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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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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.

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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Answer:

I guess equal to ABD