A chemist finds that when platinum is added to a reaction, the reaction speeds up. He thinks the platinum may be acting as a catalyst. What measurement should the chemist make to determine whether it is a catalyst?

If a wave has a frequency of 4 Hz and a speed of 24 m/s, which is its wavelength?

In the current model of the atom, electrons and protons are mixed together in a solid sphere electrons travel as waves in the electron cloud that surrounds the nucleus electrons orbit around the nucleus like planets orbit the sun electrons and

A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60° below horizontal. How much work does the child do on the balloon?

Sound waves cannot travel in a. steel. b. air. c. a vacuum. d. water. e. sound can travel in all of the above.

Prove dimensionally V=at

Imagine that you replace the block in the video with a happy or sad ball identical to the one used as a pendulum, so that the sad ball strikes a sad ball and the happy ball strikes a happy ball.

Under what conditions will an object experience a gravitational force? Under what conditions will an object experience an electric force? Under what conditions will an object experience a magnetic force?

A basketball player pushes down with a force of 34 N on a basketball that is inflated to a gauge pressure of 9 x 104 Pa. What is the diameter of contact between the ball! and the floor?

Match these terms with their definitions: 1. unit of electrical resistance ampere 2. unit of electromotive force or electrical potential ohm 3. unit for measuring the strength of an electric current volt 4. unit of electrical power watt

In which is momentum conserved: an elastic collision or an inelastic collision?