When is mechanical energy conserved?

There are four people in the car, the driver slams on the gas pedal and all the passengers heads hit the headrest behind them when the car accelerates forward.

A ball is dropped from a height of 120 meters. If it takes 2.00 seconds for a ball to fall 60 meters, how long will it take the ball to reach the ground?

A spinning top rotates so that its edge turns at a constant speed of 0.63 m/s. If the top has a radius of 0.10 m, what is the centripetal acceleration of the edge of the top? 0.016 m/s2 0.73 m/s2 4.0 m/s2 6.3 m/s2

How do black holes attract space matter?

A boat is headed due north on a river that's flowing directly east. What is the general direction of travel for this boat with respect to the land?

Is momentum conserved in the collision?

Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?

In a laboratory, you determine that the density of a certain solid is 5.23*10-6kg/mm3. Convert this density into kilograms per cubic meters.

List the solar objects in correct order from the Sun. Venus Earth Mercury Saturn Neptune Mars Jupiter Asteroid Belt The Sun Uranus

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. The area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?