Answer:
ummm I didn't understand the question
how do sound waves behave as a solid
a. they travel faster in a solid than other mediums
b. they travel slower in a solid than other solids
c. they stop when they hit a solid
d.sound waves behave the same in any medium
Answer:
A. They travel faster in a solid than other mediums
Explanation:
Sound waves travel faster in solids because the density of solids is higher than that of liquids which means that the particles are closer together and sound can be transmitted more easily.
4. Shirley Bored sits in her seat in the English classroom. The force of gravity on Earth pulls
down on Shirley's body with 600 N of force. What is the direction and size of the reaction
force acting on Shirley?
Answer:
600 N upward
Explanation:
According to Newton's third law, for every action their is an equal and opposite reaction. The equal and opposite reaction to a downward force of magnitude 600 N is an upward force of magnitude 600 N
1. Your big brother, despite warning, drops a penny off the observation
deck of the Empire State Building in New York City. The observation
deck is 381 m above the ground. What is the terminal velocity of the
penny? How far has the penny fallen after 3 seconds?
Answer:
The marble will take 8.813 seconds to hit the ground.
Explanation:
The marble will fall according to this motion equation: y(final) = y(initial) + v(initial)×t + 1/2×a×t×t
y(final)=0 m, the marble's final position in relation to the ground
y(initial)=381 m, the marble's initial position in relation to the ground
v(initial)=0 m/s (meters per second), the marble's initial velocity (speed with direction) when fall first begins
t=? seconds, this is the amount of time that passes while falling, the variable in this problem
a=-9.81 m/s/s, the rate at which the velocity of the marble changes, acceleration. On Earth, neglecting friction, acceleration is a constant at negative 9.81 meters per second squared
Plug the values into the equation: 0= 381 + 0t + 1/2(-9.81)(t)(t)
Subtract 381 from both sides and disregard 0t because it has no value and no longer matters: -381= 1/2(-9.81)(t)(t)
Multiply out the equation: -381= -4.905(t)(t)
Divide both sides by -4.905 to isolate the variable: 77.676=(t)(t)
Find the square root of both sides: t=8.813 seconds
Find the average speed of a car that goes 80 miles in 3 hrs.
Answer:
26.6666666667Explanation:
80 divided by 3
The average speed was 26.67 Miles per hour (mph)
speed= distance ÷ time
speed= 80 miles ÷ 3 hours
speed= 26.67mph
Hope this helped you- have a good day bro cya)
What is the acceleration of a car that maintains a constant velocity of 24 m/s for 10 seconds?
a.
24 m/s2
b.
240 m/s2
c.
2.4 m/s2
d.
0 m/s2
A 5.0 kg flying squirrel is flying from a tree down to the ground at constant velocity. Consider air resistance. Diagram the forces acting on the squirrel
The free body diagram of the squirrel motion, the weight of the squirrel is acting downwards while the air resistance is acting upwards.
The given parameters;
mass of the squirrel, m = 5 kgacceleration due to gravity = 9.8 m/s²At a constant velocity downwards, the vertical acceleration is zero.
The downward force on the squirrel is calculated as follows;
W = mg - ma
W = m(g - a)
W = m(g - 0)
W = mg
W = 5 x 9.8
W = 49 N
The air resistance on the squirrel which is acting upwards is calculated as;
n = ma + mg
n = m(a + g)
n = m(0 + g)
n = mg
n = 5 x 9.8
n = 49 N
The free body diagram is presented below;
↑ n
Ο
↓ W
Thus, in the free body diagram of the squirrel motion, the weight of the squirrel is acting downwards while the air resistance is acting upwards.
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Everytime a train passes Ms. Lindsey's house, one specific item on her dresser rattles. Use physics to explain why this occurs.
Answer: gravity
Explanation: the moving and sifting around in the train
Which component that makes up the bulk of all galaxies?
A. gas
B. dark matter
C. dust
D. stars
Answer: B Dark matter
We have that for the Question "Which component that makes up the bulk of all galaxies? A. gas B. dark matter C. dust D. stars" it can be said that Invariably the dark matter makes up the bulk of all galaxies
Option B
From the question we are told
Which component that makes up the bulk of all galaxies?
A. gas
B. dark matter
C. dust
D. stars
Generally
the Galaxy have a mass of about 2*10^{12} mass of sun
This is made up of 95% of dark matter
Therefore
Invariably the dark matter makes up the bulk of all galaxies
Option B
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As an airplane leaves the runway and goes into the air, has acceleration occurred?
a
Yes, the plane changed direction.
b
No, the speed is not mentioned.
c
Not enough information.
d
No, acceleration does not include going in an upwards direction.
(03.02 LC)
Which of the following is a complementary base pair for DNA?
O Adenine and cytosine
O Guanine and cytosine
O Adenine and guanine
O Cytosine and thymine
Answer:
O Adenine and guanine
Explanation:
i think tell me if im rong
Guanine and cytosine are complementary base pairs for DNA, hence option B is correct.
What is the complementary base pairing in DNA?Adenine and thymine are joined by two hydrogen bonds, whereas guanine and cytosine are joined by three hydrogen bonds.
Base pair of DNA. The nitrogen-containing bases adenine (A), thymine (T), and cytosine (C), as well as guanine (G), the couple together under normal conditions. The structure of DNA is created by the binding of these base pairs.
In order to construct the helical structure of DNA, complementary base pairing is crucial because it enables the base pairs to be placed in the most energetically advantageous manner.
Therefore, due to the fact that it permits semiconservative replication, it is also crucial in replication.
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Researchers believe _____ helps strengthen and enhance long-term memory formation.
A. hypnosis
B. sleep
C. dreaming
D. meditation
Researchers believe that sleep helps strengthen and enhance long-term memory function. Hence, option B is correct.
What is Meditation?Meditation could be thought of as a series of practices that encourage enhanced awareness and focused attention. Meditation is a different way to change awareness that has been shown to have several benefits for psychological well-being.
To feel refreshed and alert when you get up, sleep is a crucial process that allows your body and mind to heal. The body needs adequate sleep to remain healthy and free of disease. Without enough sleep, the brain cannot work efficiently. This may affect your ability to concentrate, think clearly, and process memories.
That's the reason researchers believe that sleep help in enhancing longer memory function.
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1. A bicyclist travels for 1.5 hours at an average speed of 23 km/h. How far does the bicyclist travel
in that time?
Explanation:
23 km/hr x 1.5 hrs = 34.5 km
34.5 km = 34500 meters
Calculate Speed The 2-kg metal ball moving at a speed of 3 m/s strikes a 1-kg wooden ball that is at rest. After the collision, the speed of the metal ball is 1 m/s.
Assuming momentum is conserved, what is the speed of the wooden ball?
Answer:
53466kg.
Explanatiokn:
I NEED THIS ASAP PLEASE
Answer:
wash or dry cleanmeasuring tapeupper arm girthtapeheightmeasuring tapebistlinewaistlineabdomenhip or seatExplanation:
please mark brainiest
a father and his son are racing down a mountain. if they're traveling at the same velocity who has more kinetic energy
Answer:
I think it's the son
Explanation:
bcs he might love it
A crane lifts 1800kg mass through a vertical height of 6cm in 9 seconds, Taking (g) as 10N/kg. what is the cranes power output?
Explanation:
power output=(1800×10×0.06)/9=120watts
Please explain tyyy!
Answer:
electromagnetic spectrum is the range of frequencies of electromagnetic radiation and their respective wavelengths and photon energies.
Explanation:
brainliest me
Answer:
The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.
ok write it
The mass of an object is 100mg. What is the object's mass in kg? Show your work
Answer:
0.0001 kg
Explanation:
The weight in Kilograms is equal to the milligrams divided by 1,000,000.
100 ÷ 1,000,000
A box slides down a frictionless incline, gaining speed. The work done by the normal force n is _______.
a.) positive
b.) negative
c.) zero
d.) undefined
Answer:
0
Explanation:
The normal force will be perpendicular to the motion. A zero-work situation is one where "a force everywhere perpendicular to the motion does no work" so according to this principle, no work is done.
The work done by the normal force n when the box slides down a frictionless incline and gaining speed is zero.
What is normal force?The force of contact is called the normal force. When the two surfaces are in contact with each other, then the normal force acts.
This force is applied by the solid bodies on each other in order to prevent the passing through each other.
A box slides down a frictionless incline, gaining speed. For this box, the value of work done by normal force has to be found out. Let's analyze the given condition.
The body is gaining the speed, which means there is a change in kinetic energy.The change in kinetic energy is equal to the work done.The friction force is the product of coefficient of the friction and normal force.The friction force for the given case is zero. Thus, the normal force must be equal to the zero.Thus, the work done by the normal force n when the box slides down a frictionless incline and gaining speed is zero.
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A rubber duck of volume 2,500cm3 floats in water with 20% of its volume submerged. You want to hold the duck under water so it is at rest and completely submerged. How much force do you have to apply? If you release the duck, what will be its acceleration at that instant?
The force applied to the submerged rubber duck is 4.9 N.
Density of the rubber duck
The density of the rubber duck is calculated as follows;
ρ = S.G x density of water
ρ = 0.2 x 1000 kg/m³
ρ = 200 kg/m³
Force applied to the duckF = mg = (ρV)g
F = (200 x 0.0025) x 9.8
F = 4.9 N
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When the propeller were turning at 25 rad/s , what is the period (in seconds) of this propeller?
Answer:
Explanation:
T = (2π rad / rev) / (25 rad/s) = 0.251327... = 0.25 s
The propeller was turning at 25 rad/s then the period of the propeller will be equal to 0.25 seconds.
What is Velocity?In terms of physics, velocity is a vector assessment of the motion's direction and speed. The rate of change in an object's position relative to a reference frame and time is the more precise definition of velocity. Simply put, the concept of velocity informs us of the rate at which an object is travelling in a given direction.
It indicates the rate of motion of objects. Take two moving things like our illustration. If both items are travelling in the same vague direction, it is simple to determine which is moving more quickly.
From the given data in the question,
T = 2π (rad/rev) / 25 (rad/s)
T = 0.25 seconds.
Therefore, the period of this propeller is 0.25 seconds.
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Earth Atmosfear is uniqe amongst the planets and is able to support life because it contains a large amount of __?
A. oxygen
B. helium
C. Methane
D. Carbon Dioxide
Answer:
A
Explanation:
The abundance of oxygen in our atmosphere and the presence of liquid water on the surface of our planet makes our "Pale Blue Dot" stand out in contrast to the other planets in the solar system — a unique and fragile home for life.
Why are the alkali metals likely to react with group 17 elements?
Answer:
Because alkali metals are so reactive, they are found in nature only in combination with other elements. They often combine with group 17 elements, which are very “eager” to gain an electron.
Explanation:
hope this helps you if it does please mark brainliest
A particle at the origin is experiencing three forces. The first one has a magnitude of 57 lb and is directed towards (2,-4,5), while the second one has a magnitude of 32 lb and is directed towards (-1,-2,-8). If the net force is 41 lb in the direction of (-5,-1,4), what is the x-component of the third force acting on the particle (in lb)?
The x-component of the third force acting on the particle is 41.2 lb.
The given parameters;
(2, -4, 5) = 57 lb(-1, -2, -8) = 32 lb(-5, -1, 4) = 41 lbThe vector components of the forces is calculated as;
[tex]F_1 = 57, (2,-4, 5) = 57\times \frac{2i -4j+ 5k}{\sqrt{2^2 + 4^2 + 5^2} } = 8.5(2i -4j+ 5k)\\\\F_1 = (17 i -34j + 42.5k)lb\\\\\\ F_2 = 32, (-1, -2, -8) = 32\times \frac{-i -2j-8k}{\sqrt{1^2 + 2^2 + 8^2} } = 8.3(-i-2j-8k)\\\\ F_2 = (-8.3i - 16.6j - 66.4k)lb\\\\\\ F_{net}= 41, (-5, -1, 4) = 41\times \frac{-5i -j+ 4k}{\sqrt{5^2 + 1^2 + 4^2} } = 6.5(-5i-j+ 4k)\\\\ F_{net} = (-32.5i -6.5j+ 24k)lb[/tex]
The x-component of the third force is calculated from the resultant of the forces;
[tex]F_1+F_2 + F_3 = F_{net}\\\\F_3 = F_{net} - (F_1 + F_2)\\\\F_3 = (-32.5i -6.5j + 24k) - (17i -34j + 42.5k) - (-8.3i -16.6j -66.4k)\\\\F_3 = (-32.5 -17 + 8.3)i +(-6.5 + 34+ 16.6)j + (24 -42.5+66.4)k\\\\F_3=(-41.2 i) +(44.1)j + (47.9)k\\\\F_3 = (-41.2i + 44.1 j + 47.9k)lb[/tex]
Thus, the x-component of the third force acting on the particle is 41.2 lb.
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Electrons are ____________ charged particles. Answer here
Answer:
negatively charged
Explanation:
Answer: electrons are negative charged
Explanation:
In terms of energy transfer, how is a rise in
temperature different from a drop in
temperature?
Answer:
Let's look deeper into it.
Explanation:
Heat energy corresponds to the transfer of thermal energy between two given objects. Temperature itself gives off the measurement of how much thermal energy any given object has.
The higher the measurement, the more heat there is. The lower the measurement, the less heat there is.
How much force (in Newtons) is needed to accelerate a 160 kg object at a rate of 4 m/s2?
A. 15
B. 40
C. 640
D. .025
Answer:
C. 640
Explanation:
The minimum force would occur in a frictionless environment and act parallel to any abutting surface.
F = ma = 160(4) = 640 N
When you view the pendulum’s swing, it shows that at the very top of the swing KE = 0. What does that tell you about the pendulum’s motion at that point?
it tells you that it has a lot of force
Answer:
Since I couldn't find the other answers to the same question, I wrote the wrong answer to help ya'll get the sample response. So here's from Edge
Explanation:
Sample Response: If KE = 0, the pendulum is not moving. At the top of the swing, the pendulum must stop for a brief moment.
A plane is traveling with an air velocity of 720 kilometers/hour due east. It experiences a headwind of 16 kilometers/hour. Find the resultant velocity and direction of the plane with respect to the ground.
A 500 kg airplane wing is hanging on a rope from the ceiling. What is the tension force being supplied by the rope?
a.5000
b.2500
c.250
d.500
Answer:
a. 5000 N
Explanation:
If gravity is 10 m/s² and the wing is motionless.
F = ma = 500(10) = 5000 N
