PHYSICAL SCIENCE Exam 2
A dropped ball gains speed because
a gravitational force acts on it
A satellite near Earth makes a full circle in about 90 minutes. Much farther from Earth, say at the distance to the Moon, time for a full circle would be
about 28 days
Occupants of the International Space Station experience weightlessness due to
absence of a support force
The circular path of a satellite orbiting Earth is characterized by a constant
all the above
A bullet fired from a rifle begins to fall
as soon as it leaves the barrel
Earth satellites are typically more than 100-km high so as to mainly be able the Earth's
atmosphere
A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. The ball to hit the floor first is the
both hit at the same time
Acceleration is greater for a satellite in elliptical orbit when it is
closest to Earth
An Earth satellite in an elliptical orbit travels slowest when it is
farthest from the Earth
Compared with the period of satellites in orbit close to Earth, the period of satellites in orbit far from Earth is
greater
According to Newton, the greater the masses of interacting objects, the
greater the gravitational force between them
As a bowling ball that rolls off the edge of a table falls, its vertical component of motion
increases
When the distance between a pair of stars decreases by half, the force between them
increases to four times as much
According to Newton, the greater the distance between gravitational interacting objects, the
less the gravitational force between them
At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same when this point is
nearer the Moon
An Earth satellite in an elliptical orbit travels fastest when it is
nearest the Earth
Communications and weather satellites always appear at the same place in the sky because these satellites are
orbiting Earth with a 24-hour period
The force of gravity on a satellite in circular orbit doesn't change its speed because the force is
perpendicular to its direction of motion
A stone thrown horizontally from the top of a cliff. One second after leaving your and it drops a vertical distance of
5 m
A projectile is launched straight upward at 50 m/s. Neglecting air resistance its speed upon returning to its starting point is
50 m/s
Escape speed from Earth is
11.2 km/s
An object is places exactly halfway between the Earth and the Moon. The object will fall toward the
Earth
As a bowling ball that rolls off the edge of a table falls, its horizontal component of motion
remains constant
Escape speed for a rocket is less from
the Moon
Your weight is defined to be the force
you exert against a supporting surface