30. A student correctly determined the

density of two rocks. If the volumes of

the two rocks are equal, the rock with

the greater density has a

A. rounder shape

B. smoother surface

C. greater mass

D. smaller size

A sound technician is testing the sound acoustics in a theatre for an upcoming music concert. As he moves towards the speakers, he notices the pitch of the music gets higher.

What are the negative aspects of using nuclear energy? Select all that apply. - It creates solid radioactive waste that has to be stored safely over the long term - Produces a great deal of air pollution - Risk of danger at reactor sites - Adds

How do objects become negatively charged using the contact method

A string is wrapped around a pulley with a radius of 2.0 cm and no appreciable friction in its axle. The pulley is initially not turning.

Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy A. According to Hubble's law, what can you say about their approximate relative distances? a.

Oil having a density of 924 kg/m 3 floats on water. A rectangular block of wood 3.79 cm high and with a density of 970 kg/m3 floats partly in the oil and partly in the water. The oil completely covers the block.

Where does the energy that is used to ride a bicycle up a hill come from and how is it classified?

Explain how the energy of a rubber ball is transformed as it rolls down a ramp.

Which type of friction acts on an object that is not moving? static friction fluid friction sliding friction rolling friction

A substance maintaining a uniform appearance throughout