Test 2
According to Newton, doubling the distance between two interacting objects
divides by 4 the gravitational force between them.
A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force experienced by her hand is
identical to the force applied to the block
A bullet is fired from a gun. The speed of the bullet will be about the same as the speed of the recoiling gun
if the mass of the bullet equals the mass of the gun
An object may have potential energy because of its
location
When you are in the way of a fast-moving object and can't get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a
long time
The reason the moon does not crash into the Earth is that the
moon has a sufficient tangential speed to keep it in orbit for a very long time
An object that has kinetic energy must be
moving
A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will have a greater
none of these (speed, acceleration, momentum)
Newton discovered
that gravity is universal
No work is done by gravity on a bowling ball that rolls along a bowling alley because
the force on the ball is at right angles to the ball's motion.
After rolling halfway down an incline, a marble's kinetic energy is
the same as its potential energy
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. This force is directed
toward the astroid
If you push an object a given distance, while applying twice the force, you do
twice as much work
Compared to falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
**dont know**
The concept of force is not fundamental to
Einsteins theory of gravitation
How far must one travel to get away from the Earth's gravitational field?
Forget it, you can't travel far enough
Which of the following has the largest momentum relative to the Earth's surface?
a pickup truck speeding along a highway
When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. In this way the average force your body experiences is
about 1/10 as great
Do 100 J of work in 50 s and your power output is
2 W
The best time for digging clams (when the low tide is extra low) is during the time of the
new or full moon
The Earth's gravitational field extends
both inside and outside the Earth and throughout the entire universe.
A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is
greater
A clerk can lift containers a vertical distance of 1 meter or can roll them up a 2 meter-long ramp to the same elevation. With the ramp, the applied force required is about
half as much
If the mass of the Earth somehow increased with no change in radius, your weight would
increase also
When two objects interact, conservation of momentum is most closely related to
newtons 3rd law
If you push for a half hour or a whole hour against a stationary wall
no work on the wall is done in either case
When a star collapses to form a black hole, its mass
remains the same
Suppose that a tiny gun made of a strong but very light material fires a bullet that is more massive than the gun itself. For such a weapon
the target would be safer than the shooter
If you do work on an object in one-third the usual time, your power output is
three times the usual power output
An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is
twice as much
