Physics Exam 2 (final)


Physics
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If you push an object twice as far while applying the same force, you do
 
twice as much work
A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of
 
power
If an object is raised twice as high, its potential energy will be
 
twice as much
A ball rolling down an incline has its maximum kinetic energy at
 
the bottom
No work is done by gravity on a bowling ball that rolls along a bowling alley becauuse
 
the force on the ball is at right angles to the ball's motion
A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is
 
50%
A moving object has
 
speed, velocity, momentum, and energy
A feather and a coin dropped in a vacuum fall with equal
 
accelerations
Which moves faster in m/s on a merry-go-round: a horse on the inside or a horse on the outside near the rim?
 
outside horse
An industrial flywheel has a greater rotational inertia when most of its mass is
 
nearest the rim
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
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
When a twirling ice skater brings her arms inward, her rotational speed
 
increases
Consider a rotating donut-shaped space habitat where living quarters are on the inside surface farthest from the axis. If the rotational speed of the habitat increases, the apparent weight of people inside
 
increases
For a system in mechanical equilibrium the resultant forces and torques must
 
both be zero
According to Newton, the greater the masses of interacting objects, the
 
greater the gravitational force between them
According to Newton, doubling the distance between two interacting objects
 
divides by 4 the gravitational force between them
What is the force of gravity on a 500 N woman standing on the Earth's surface?
 
500 N
The earth's gravitational field extends
 
both inside and outside the earth and throughout the entire universe
Which is most responsible for the ocean tides? the moon or the sun?
 
the moon
According to Kepler's laws, the paths of planets about the sun are
 
ellipses
Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity
 
remains constant
An earth satellite is simply a projectile
 
freely falling around the earth
the fastest moving planet in a solar system is
 
the planet nearest hte sun
a "weightless" astronaut in an orbiting shuttle is
 
like the shuttle, pulled by earth's gravitation
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