A 1.5-kg copper block is given an initial speed of 3.0 m/s on a rough horizontal surface. Because of friction, the block finally comes to rest. What happens to the remaining energy?

The position of a baseball relative to home plate changes from $\langle 15,8,-3\rangle \mathrm{m}$ to $\langle 20,6,-1\rangle \mathrm{m}$ in 0.1 s. As a vector, write the average velocity of the baseball during this time interval.

What mass of water at $25.0^{\circ} \mathrm{C}$ must be allowed to come to thermal equilibrium with a 1.85-kg cube of aluminum initially at $150^{\circ} \mathrm{C}$ to lower the temperature of the aluminum to $65.0^{\circ} \mathrm{C}?$ Assume any water turned to steam subsequently condenses.

A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for breakfast. If the human body is only 25% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast?

A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for breakfast. How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm.

A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for breakfast. How many joules of energy are the equivalent of one jelly doughnut?

The temperature of a silver bar rises by $10.0^{\circ} \mathrm{C}$ when it absorbs $1.23 \mathrm{~kJ}$ of energy by heat. The mass of the bar is $525 \mathrm{~g}$. Determine the specific heat of silver.

Escribe la forma apropiada del verbo tener para cada frase. Luego (then) resuelve el problema. ¿Cuántos años BLANK nuestro hermano mayor, Enrique?

Match the definitions below with a vocabulary term from the Study Guide page. A(n) ___________ is an agent that causes an infectious disease.

A 1.50-kg iron horseshoe initially at 600$^ { \circ } \mathrm { C }$ is dropped into a bucket containing 20.0 kg of water at 25.0$^ { \circ } \mathrm { C }$. What is the final temperature of the water–horseshoe system? Ignore the heat capacity of the container and assume a negligible amount of water boils away.

Using the two excerpts at the bottom of the previous page, answer (a), (b), and (c). a. Briefly explain ONE major difference between Ambrose's and Westad's historical interpretations of the Cold War. b. Briefly explain how ONE specific historical event or development from the period 1945 to 1980 that is not explicitly mentioned in the excerpts could be used to support Ambrose's interpretation. c. Briefly explain how ONE specific historical event or development from the period 1945 to 1980 that is not explicitly mentioned in the excerpts could be used to support Westad's interpretation.

Noxious fumes from a garage enter an adjacent $2,000-\text{ft}^{3}$ workroom through a vent at the rate of $0.2 \mathrm{ft}^{3} / \mathrm{min},$ and the mixed air (fresh air and fumes) escapes through a crack under the door at the same rate. a. Set up and solve a differential equation for the amount of noxious fumes g(t) in the room t minutes after it begins to enter the room [so g(0) = 0]. b. The air in the room becomes hazardous when it contains 1% noxious fumes. How long does it take for this to occur?

Long-term space missions require reclamation of the oxygen in the carbon dioxide exhaled by the crew. In one method of reclamation, 1.00 mol of carbon dioxide produces 1.00 mol of oxygen, with 1.00 mol of methane as a by-product. The methane is stored in a tank under pressure and is available to control the attitude of the spacecraft by controlled venting. A single astronaut exhales 1.09 kg of carbon dioxide each day. If the methane generated in the recycling of three astronauts’ respiration during one week of flight is stored in an originally empty 150-L tank at -45.0$^ { \circ } \mathrm { C }$, what is the final pressure in the tank?

A freshly baked cherry pie is exactly $9 \frac{1}{2}$ inches in diameter. If the pie is cut into eight perfectly equal slices, what is the perimeter of each slice?