PHYS Ch. 8,9,10
11. According to Newton, the greater the masses of interacting objects, the
greater the gravitational force between them
A torque acting on an object tends to produce
rotation
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be
40 N
An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be
1 g downward
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later?
100
An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed of
141 km/h
A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to the Earth, the boat travels
141 m
Suppose the circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second when you are riding the bicycle, then your speed will be
2 m/s
The ground speed of an airplane that has an airspeed of 200 km/h when it is in a 200-km/h crosswind is
283 km/h
What is the force of gravity on a 500-newton woman standing on the Earth's surface?
500 N
The concept of force is not fundamental to
Einstein's theory of gravitation
The circular path of a satellite orbiting the Earth is characterized by a constant
Speed, acceleration, radial distance
The amount of gravitational force that acts on the space shuttle while in orbit is
almost as much as the shuttle's weight on the Earth's surface
Inside a freely falling elevator, there would be no
apparent weight for you
An airplane flies at 40 m/s at an altitude of 50 meters. The pilot drops a heavy package which falls to the ground. Where, approximately, does the package land relative to the plane's new position?
beneath the place
A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the
coin
When a train makes a curve, different parts of the wheel rims
cover a different distance in the same time.
9. The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk's diameter increases during the flight, while its rotational speed
decreases
Your pet hamster sits on a record player whose angular speed is constant. If he moves to a point twice as far from the center, then his linear speed
doubles
A broom is easier to balance on its end when the heavier end (the brush end) is
highest, farthest from your hand
If the radius of the Earth somehow decreased with no change in mass, your weight would
increase
Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them
increases
The tangential velocity of an Earth satellite is its velocity
parallel to the surface of the Earth
A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity
remains unchanged
The factor most directly responsible for making a black hole invisible is its
surface escape velocity
8. The center of mass of a human body is located at a point
that changes as a person bends over
A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
the dropped one
A person weighs less at the equator than at the poles. The main reason for this has to do with
the spin of the Earth
Put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you'll multiply the torque by
two
Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are
without support forces