As a giant cloud of gas collapses due to gravity, you would expect its rate of rotation to
stay unchanged
decrease
increase - Answers increase
Which of the following represents a change from potential energy to kinetic energy?
A kicked ball rising higher in the air and momentarily coming to rest at the top of its trajectory.
A rock starting from rest on a high cliff, then moving faster and faster as it falls.
A car applying its brakes on a straight road and heating up the brake pads as it slows.
Sunlight melting a tray of ice. - Answers A rock starting from rest on a high cliff, then moving faster and
faster as it falls.
Suppose two objects are attracting each other gravitationally. If you double the distance between them,
the strength of their gravitational attraction __________.
decreases by a factor of 9
increases by a factor of 9
increases by a factor of 2
, decreases by a factor of 2
increases by a factor of 4
decreases by a factor of 4 - Answers decreases by a factor of 4
Which of the following are allowed orbital paths under gravity?
elliptical
getting sucked in by gravity
square
hyperbolic
parabolic - Answers elliptical
hyperbolic
parabolic
The acceleration of gravity on Earth is approximately 10 m/s2 (more precisely, 9.8 m/s2). If you drop a
rock from a tall building, about how fast will it be falling after 3 seconds?
10 m/s
20 m/s
10 m/s2
30 m/s2
30 m/s - Answers 30 m/s