Which of the following is true of friction? A friction makes motion possible on Earth. B. friction has mass and can be held. C. friction is always equal to velocity

A system has three macrostates. Macrostates 1 and 3 are least likely and have one basic state each. Macrostate 2 is the equilibrium state and is three times more likely to occur than either of the other two macrostates.

A force is applied to an object at rest with a mass of 100 kg. The same force is applied to an object at rest with a mass of 1 kg. What differences in their motion would you observe? Explain your reasoning.

What is the difference between charge by contact and charge by induction?

There are two problems that have to be taken into account when studying the spiral density wave theory. How does a galaxy get started, and how does it become stable?

4. Going down the freeway you notice your tachometer reads 4,000 RPM. a) Convert this frequency into RPS? b) Use your answer from 'a' to find the period of rotation (how long it takes your engine to spin just once) ? Answer in seconds.

A certain gas is present in a 15.0 l cylinder at 2.0 atm pressure. if the pressure is increased to 4.0 atm the volume of the gas decreases to 7.5 l.

Choose all the answers that apply. To qualify as a planet, a celestial object must: have an irregular shape revolve around the sun orbit in a clear area have enough gravity to have a spherical shape have a satellite

Oxygen makes up the largest part of living cells at 65%. What is the percentage of the second-most abundant element in living cells?

Acceleration is defined as the rate of change for which of the following? A. time B. velocity C. position D. displacement

What are 3 characteristics of a tornado?