Quiz 9: Hydrostatics
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You may take this quiz up to 3 times; I will keep your highest score. The quiz is open through Sunday, 11/20.
- 1.If the distance between two objects is doubled, what happens to the force of gravitational attraction between them?
- A.
It stays the same
- B.
It is cut in half
- C.
It doubles
- D.
It is 1/4 as strong
- 2.When calculating the force of gravity between two objects, you need to measure the distance between:
- A.
The centers of mass of the two objects
- B.
The points where the objects surfaces are closest to each other
- C.
The points where the objects surfaces are farthest away from each other
- D.
Two arbitrary points within the objects' mass
- 3.According to Keler, the path of a planet's orbit is in the shape of _____________.
- A.
A circle, with the sun at the center
- B.
An ellipse, with the sun at one of the foci
- C.
A circle, with the earth at the center
- D.
An ellipse, with the earth at one of the foci
- 4.When playing billiards, the collisions between the balls are best described as __________________.
- A.
Elastic
- B.
Inelastic
- C.
Expensive
- D.
Exhaustive
- 5.The kinetic energy of an object will increase the most if you __________________.
- A.
Double the velocity of the object
- B.
Double the mass of the object
- C.
Double the potential energy
- D.
Double the temperature of the object
- 6.Atmospheric pressure at sea level is caused by ________________.
- A.
The force of gravity on the air
- B.
The potential energy of molecules
- C.
The gravitational pull of the sun
- D.
The vacuum of space
- 7.Atmospheric pressure is pushing in on us all the time, but we don't feel it because ___________________.
- A.
It only works on gas
- B.
It is balanced by the pressure of the fluid in our cells
- C.
Gravity cancels it out
- D.
We can't feel air
- 8.Water pressure increases the farther down you go because ________________________.
- A.
You are closer to the center of the earth
- B.
The water molecules are packed together more tightly
- C.
The weight of all of the water above you increases the pressure
- D.
You get smaller the farther down you go
- 9.An object will float in a fluid if ______________________.
- A.
The fluid displaced by the object weighs more than the object
- B.
The object is small
- C.
The fluid is colder than the object
- D.
The fluid is a liquid, not a gas
- 10.If you have a helium balloon floating behind you in your car, and you turn sharply to the left, the balloon will ______________.
- A.
Move to the right of the car because of inertia keeping it moving in a straight line
- B.
Be forced to the left of the car by the inertia of the air in the car displacing it
- C.
Not move because it is lighter than the air around it
- D.
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