Which of the following statements is true of a gas?

It has a fixed volume, but not a fixed shape

It has closely packed molecules

It can change into a liquid by adding heat

It takes the shape and size of a container

Is it possible to walk for ten seconds at high speed and have 0 velocity? If so, provide an example. If not, explain why.

How is the percent efficiency of a machine determined?

What is the speed of a periodic wave with a frequency of 4.5 Hz and a wavelength of 0.9m

An electromagnetic wave in a vacuum traveling in the + x direction generated by a variable source initially has a wavelength λ of 235 μm and a maximum electric field Emax in the + y direction of 3.30*10-3 V/m.

Between which pair of objects would the largest gravitational attraction be found

Why did the chicken cross the road.

A 98.1 kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.69 rad/s. A monkey drops a 9.29 kg bunch of bananas vertically onto the platform.

7. A type of non-renewable energy would be: O wind O petroleum O water solar

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.