# Physics 101 Test 2

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kilograms

centrifugal

Newtons

proton

element

electron sharing

### Measure of pressure\

pounds per square inch

electron

isotope

### A car travels in a circle with constant speed. The net force on the car is\

directed towards the center of the curve.

### A satellite orbits the earth at an unchanging speed of 18,000 mph. This satellite\

both of the above.

### According to Newton, doubling the distance between two interacting objects\

divides by 4 the gravitational force between them.

increase

500 N

increase also.

### Inside a freely-falling elevator, there would be no

apparent weight for you.

an eighth of

40 N.

speed

5 m.

decreases.

### A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, its horizontal component of velocity

remains unchanged.

### Throw an object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 second, it is

about 5 m below the straight line.

50 m/s.

### An Earth satellite is simply a projectile

freely falling around the earth.

30 degrees.

### After a rock thrown straight up reaches the top of its path and then falls a short distance, its acceleration is (neglect air resistance)

the same as it was at the top of its path.

600 m.

### Water pressure is greatest against the

bottom of a submerged object.

1000 kg.

### Pumice is a volcanic rock that floats. Its density is

less than the density of water.

volume of fluid.

10 tons

### When an object is partly or wholly immersed in a liquid, it is buoyed up

by a force equal to the weight of liquid displaced.

### The reason a life jacket helps you float is

the density of both you and the jacket together is less than your density alone.

2 N

### Ice cubes submerged at the bottom of a liquid indicate that the liquid

is less dense than ice.

### A liter-sized block of ordinary wood floats in water. The amount of water displaced is

less than 1 liter.

### Atmospheric pressure is caused by the

weight of the atmosphere.

101,000 N

### A balloon is buoyed up with a force equal to the

weight of air it displaces.

bigger.

### In drinking soda or water through a straw, we make use of

atmospheric pressure.

### The flight of a blimp best illustrates

the principle of Archimedes.

### Airplane flight best illustrates

Bernoulli's principle.

### The faster a fluid moves, the

less its internal pressure.

### A suction cup sticks to a wall. It is

pushed to the wall by the atmosphere.

### Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise

the same height as in the larger tube.

none of these

### Alcohol is less dense than water. If alcohol is used to make a barometer on a day when atmospheric pressure is normal, the height of the alcohol column would be

more than 10.3 m.

doubles.

### It would be easier to pull evacuated Magdeburg hemispheres apart when they are

20 km above the ocean surface.

### Suspend a pair of Ping-Pong balls from two strings so there is a small space between them. If you blow air between the balls, they will swing

toward each other.

larger.

2 times

48 m/s

40 m

120 lb

Example: