What is the force that opposes motion and can be found anytime two surfaces are in contact?

The mass of an electron is ... A. equal to the mass of the proton and the neutron B. not significant to the overall mass of the atom C. higher than the mass of the proton or the neutron

An individual is a fifty-year-old smoker that lives in a highly polluted city, gets no exercise, eats fast food every day, and has a family history of lung cancer. Which of the following is an uncontrollable risk factor?

1. In the laboratory, the life time of a particle moving with speed 2.8 x 10^10 cm/s is found to be 2.5 x 10^-7. Calculate the proper life of the particle.

What kind of substances diffuse most through a cell membrane

An electron is released from the negatively-charged plate of a parallel plate capacitor, initially at rest, and it is accelerated across the gap to hit the positively-charged plate.

Saved A clay ball and a rubber ball have equal masses. A student releases each ball from rest from the same height. The clay ball sticks to the ground while the rubber ball bounces back up.

Which of the following are NOT two of the best ways to StaySafe around electricity?

If electrons of energy 12.8 ev are incident on a gas of hydrogen atoms in their ground state, what are the energies of the photons that are emitted by the excited gas?

Which of the follow choices defines energy in scientific terms 1). The ability to do work. 2). The motion of an object. 3). A force used on an object. 4). a change in temperature.

A pebble is thrown into a calm lake, ripples are formed from the center and move outward. The water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels