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3 years ago

Why is atomaspheric pressure greater at the surface on Earth

2 answers:

8 0

Because there are miles of air on top of you and air has mass so all the mass of the air on top of you is on your head and the ground. (the air can't penetrate the ground)

Take note: Air is also denser at sea level because it was compressed.

andrew-mc [135]3 years ago

5 0

Hello!

Because as you get closer to the surface of the earth, the more air that is on top of you. At the top of the atmosphere, there is less air, and everything is a vacuum, where you have no weight. When you get close to the earth, the weight of the air builds until it when you're at the very lowest point of the earths surface, all the air in the atmosphere above you is pressing down.

Thank You!

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Suppose an empty grocery cart rolls downhill in a parking lot. The cart has a maximum speed of 1.3 m/s when it hits the side of

Ket [755]

The cart comes to rest from 1.3 m/s in a matter of 0.30 s, so it undergoes an acceleration a of

a = (0 - 1.3 m/s) / (0.30 s)

a ≈ -4.33 m/s²

This acceleration is applied by a force of -65 N, i.e. a force of 65 N that opposes the cart's motion downhill. So the cart has a mass m such that

-65 N = m (-4.33 m/s²)

m = 15 kg

4 0

3 years ago

Jack and Jill are maneuvering a 3100 kg boat near a dock. Initially the boat's position is < 2, 0, 3 > m and its speed is

liraira [26]

Answer:

(a) work done by Jack is -2200J

(b) work done by Jill is 0

Explanation:

Given;

Initially boat's position = < 2, 0, 3 > m

Final boat's position = < 6, 0, 1 > m

change in position = < 4, 0, -2 >

Force exerted by Jack = < -440, 0, 220 > N

Force exerted by Jill = < 170, 0, 340 > N

Part (a) How much work does Jack do?

work done = force x distance

Jack's work = < -440, 0, 220 > N x < 4, 0, -2 > m

= [(-440*4) + (0*0) + (220*-2)]

= -1760 J - 440 J

= -2200J

Part (b) How much work does Jill do?

Jill's work = < 170, 0, 340 > N x < 4, 0, -2> m

= [(170*4) + (0*0) + (340*-2)]

= 680 J - 680 J

= 0

7 0

4 years ago

Is F=mxa expressed in equation in newtons second law of motion?

kow [346]

Yes. That equation is exactly how we write Newton's second law nowadays. Note that the 'x' just means 'times'. It's not another variable. The equation could be written as simply. F = m a .

6 0

4 years ago

I’ll give brainliest!! please help and answer correctly! plsss answer quick

noname [10]

Answer:

i dont think anything will happen so maybe A: the wall is larger than you.

Explanation:

8 0

3 years ago

a pitcher throws a softball toward the home plate. when the ball hits the catchers mitt its horizontal velocity is 32 meters/sec

lora16 [44]

F = (mass)(acceleration) = ma

m = 0.2 kg

Vi = 32 m/s

t = 0.5 s

Vf = 0 m/s (since it was put to stop)

a=(Vf-Vi)/t

a=(0-32)/0.5

a = 64 m/s^2 (decelerating)

F = ma = (0.2 kg)(64 m/s^2)

F = 12.8 N

Hope this answer will be a good help for you.

8 0

3 years ago

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