Physics Exam II

If the speed of an object in uniform circular motion is doubled while the radius remains constant, the centripetal force is multiplied by what factor?

4

A diver who weights 500N and has a potential energy of 5000J steps off a diving board that is 10m above the water. Neglecting air resistance, the diver hits the water with a kinetic energy of..?

5000J

If a high tide occurs at 9am one morning, what time will high tide occur the next morning?

9:50am

According to the Law of Universal Gravitation, when the distance between the centers of two objects is doubled and the masses remain constant, the force between the objects is multiplied by a factor of?

.25

If the distance a spring is stretched from its equilibrium position is doubled, the potential energy of the spring is multiplied by..?

.5 (Distance doubled=half the stored energy)

For the astronauts inside the orbiting space shuttle, there is no force of Earth's gravity acting on them. This statement is..?

Always false

A pendulum moves with the greatest velocity at what point?

At the bottom of its swing

Earths satellites are typically more than 100 km high so as to mainly be above the Earth's..?

Atmosphere

In the case of uniform circular motion, an object's speed is what?

Constant

What goes up must come down (T/F)?

False

How far must one travel to get away from Earth's gravity?

Forget it; You can't travel far enough

The fundamental unit of work and energy is what?

Joule

If an equivalent amount of work is done in a shorter period of time, then..?

More power is required

An object that has kinetic energy must be..?

Moving or in motion

What prevents satellites such as the space station from falling?

Nothing; They are continually falling around the Earth

Simple harmonic motion does what?

Repeats itself in equal intervals of time

Which has greater kinetic energy, a car traveling at 30 km/h or a car of half the mass traveling at 60 km/h?

The 60 km/h car

The centripetal force on an object in uniform circular motion points..?

Toward the center of the circle

A 1000 kg car and a 2000 kg car are hoisted the same distance in a gas station. Raising the more massive car requires..?

Twice as much work

If you push an object twice as far while applying the same force, you do..?

Twice as much work