A 30 kg child on a skateboard

experiences a 75-N force as shown

F = 75 NOIA

What is the expected acceleration of the

child?

Rearrange the kinetic energy equation so that velocity is the subject (kinetic energy equation = ek = 1/2 x mass x velocity ^2)

Which is caused when constructive interference occurs in sound waves? a. louder beats b. no disturbance c. softer noises d. no sounds

A moving car has kinetic energy. To bring the car to rest, you must decrease its kinetic energy to zero. The brakes do this work by applying a force over a distance. What effect would doubling the speed have on the braking distance?

Is the centripetal force and scalar or a vector?

Provide Newton's first law of motion and explain why it is important to consider this law in rocket design.

When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum. Why does this redshift occur?

Object A has a length of 3 cm, a width of 10 cm, and a height of 2 cm. Object B is dropped into a graduated cylinder. It displaces 60 mL of water. The volume of object A is:

Is the following sentence true or false? Some information about an object or process may be missing from a model.

If V is a velocity, l a length, and v a fluid property having dimensions of L2T-1, which of the following combinations are qualitatively dimensionless (show work for a through d) : (a) V l v (b) Vl/v (c) V2v (d) V / (l v)

What happens to the total mechnical energy of the apple as it falls from the tree?