If the kinetic energy of a particle is tripled, by what factor has its speed increased?

A 65.0-kg firefighter climbs a flight of stairs 20.0 m high. How much work is required?

(II) A $1.60\text{-m-tall}$ person lifts a $1.65\text{-kg}$ book off the ground so it is $2.20\ \text{m}$ above the ground. What is the potential energy of the book relative to (a) the ground,

(II) A $1.60\text{-m-tall}$ person lifts a $1.65\text{-kg}$ book off the ground so it is $2.20\ \text{m}$ above the ground. What is the potential energy of the book relative to (c ) How is the work done by a person related to the answers in parts (a) and (b)

A car drives at steady speed around a perfectly circular track. (a) The car's acceleration is zero. (b) The net force on the car is zero. (c) Both the acceleration and net force on the car point outward. (d) Both the acceleration and net force on the car point inward. (e) If there is no friction, the acceleration is outward.

Can the normal force on an object ever do work? Explain.

Why is it tiring to push hard against a solid wall even though you are doing no work?

Why is it tiring to push hard against a solid wall even though you are doing no work on the wall?

Explain the following seeming contradiction: You have two gases, A and B, in two separate containers of equal volume and at equal pressure and temperature. Therefore, you must have the same number of moles of each gas. Because the two temperatures are equal, the average kinetic energies of the two samples are equal. Therefore, since the energy of such a system corresponds to translational motion, the root mean square velocities of the two are equal, and thus the particles in each sample move, on average, with the same relative speed. Since A and B are different gases, each must have a different molar mass. If A has a higher molar mass than B, the particles of A must be hitting the sides of the container with more force. Thus the pressure in the container of gas A must be higher than that in the container with gas B. However, one of our initial assumptions was that the pressures were equal. Explain.

A $75.0 \mathrm{~kg}$ firefighter climbs a flight of stairs $28.0 \mathrm{~m}$ high. How much work does he do?

(II) A car traveling at a velocity $v$ can stop in a minimum distance $d$. What would be the car's minimum stopping distance if it were traveling at a velocity of $2v$?

Two cannonballs, A and B, are fired from the ground with identical initial speeds, but with $\theta_{\mathrm{A}}$ larger than $\theta_{\mathrm{B}}$. Which travels farther?

A chemistry student relates the following story: "I noticed my tires were a bit low and went to the gas station. As I was filling the tires, I thought about the kinetic molecular theory (KMT), and I realized that I was increasing both the pressure and volume of the tires as I filled the tires with air. 'Hmmm,' I thought, 'that goes against what I learned in chemistry, where I was told pressure and volume are inversely proportional." What is the fault of the logic of the chemistry student in this situation? Explain why we think pressure and volume to be inversely related (draw pictures and use the KMT).

If you put a drinking straw in water place your finger over the opening, and lift the straw out of the water, some water stays in the straw. Explain.