PSII - Chapter 4 Quiz
A "weightless" astronaut in an orbiting shuttle is
Like the shuttle, pulled by Earth's gravitation
From Earth, one satellite appears to overtake another. The faster satellite is
Lower
A lunar month is about 28 days. If the Moon were farther from Earth than it is now, the lunar month would be
More than 28 days
Acceleration is greatest for a satellite when it is at the
Perigee
A ball is thrown upwards and caught when it comes back down. Neglecting air resistance, the speed with which it is caught is
The same as the speed it had when thrown upwards
Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to Earth by virtue of only Earth's gravity. It will strike Earth's surface with a speed of about
11 km/s
A stone is thrown horizontally from the top of a cliff. One second after it has left your hand its vertical distance below the cliff is
5 m
Throw an object at an angle upward. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 s, it is
5 m below the straight line
What is the force of gravity on a 500-N woman standing on Earth's surface?
500 N
The fastest moving planet in a solar system is
The planet nearest the Sun
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglect air resistance)
The same as it was at the top of its path
A bullet fired horizontally hits the ground in 0.5 s. If it had been fired with twice the speed in the same direction, it would have hit the ground in
0.5 s
If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about
1 s
Ignoring air drag, what is the maximum speed that can be given to a horizontally moving tennis ball as it clears the net 1.25 m high to remain within the edge of the court, which is 12.0 m distant?
24.0 m/s
An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is
Nearest the Earth
A satellite near the Earth makes a full circle in about an hour and a half. How long would a satellite located as far away as the Moon take to orbit the Earth?
About 28 days
The circular orbit of a satellite orbiting the Earth is characterized by a constant - All of these - Acceleration - Radial distance - None of these - Speed
All of these
Without air resistance, a projectile fired horizontally at 8 km/s from atop a mountain will - All of these - Accelerate downward at g as it moves horizontally - Trace a curve that matches the Earth's curvature - Return later to its starting position and repeat its falling behavior - None of these
All of these
Inside a freely falling runaway elevator, your
Apparent weight is zero
Earth satellites are typically more than 100 km high so as to be above the Earth's
Atmosphere
The space shuttle orbits at altitudes greater than 150 km so as to be above Earth's
Atmosphere
It takes Pluto a longer time to travel around the Sun than the Earth does because Pluto - Goes slower - Both of these - Has farther to go - None of these
Both of these
Two motorcycle stunt drivers, one light and the other much heavier, drive their motorcycles up and off an inclined ramp at identical speeds. They both rise in the air and land downrange. Neglecting air drag, the one to attain the greatest height and greatest range is the - Both the same - Light driver - Heavy driver
Both the same
If Earth's mass decreased to one-half its original mass with no change in radius, then your weight would
Decrease to one-half your original weight
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity
Decreases
If the radius of the Earth somehow decreased with no change in mass, your weight would
Increase
If the mass of the Earth somehow increased with no change in radius, your weight would
Increase also
Two objects move toward each other because of gravity. As the objects get closer and closer, the acceleration of each
Increases
Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them
Increases
When the distance between two stars decreases by half, the force between them
Increases to four times as much
A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the lunar month would be
Less than 28 days
According to Newton, the greater the distance between masses of interacting objects, the
Less the gravitational force between them
Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed about Jupiter would be
More than 8 km/s
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice-as-high apples, for the same mass, have
Practically the same weight
Roll a bowling ball off the edge of a table. As it falls, its horizontal component of motion
Remains constant
Newton discovered
That gravity is universal
A hunter aims a rifle at an angle of 10° above the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
The dropped one
A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed?
20 m/s
What prevents satellites such as the space shuttle from falling?
Nothing, they continually fall all around the Earth