Give an example of a system whose mass is not constant.

1. A spinning top

2. A baseball flying through the air

3. A rocket launched from Earth

4. A block sliding on a frictionless inclined plane

The diagram shows a swinging pendulum. Which best explains what happens to the motion of the pendulum? A. The mechanical energy transforms to thermal energy as the pendulum slows and eventually stops moving. B.

Describe a positive and negative net force acting on an object

A maglev train is a train that floats above its track using magnetic levitation. Since it has no wheels, there is no friction between the train and the track. Suppose a force is applied to the train to set it in motion, and then the force is removed.

Which would be the most reliable source of information about the weather

Starting from rest, your friend dives from a high cliff into a deep lake below, yelling in excitement at the thrill of free-fall on her way down.

A galilean telescope adjusted for a relaxed eye is 36cm long. If the objective lens has a focal length of 40cm, what is the magnification?

If a car goes along a straight road heading east and speeds up from 45 ft/s to 60. ft/s in 5 sec, calculate the acceleration

To generate higher profit margins, producers must work to increase their total supply. increase their total expenses. decrease their customer base. decrease their production costs

Solar energy isn't usually used as the only power source for a reason because what

What particle can be stopped by skin