Temperature 1. A copper piece kept at room temperature (20.0°C) has a length of 4.855 um but needs to reach a length of 4.955 µm for use. What temperature change must be reached to achieve this new length? Does this change in temperature represent a heating or cooling of the piece? Show all your work, include correct sig figs and units. Box your final answer.

How much heat is needed to change 7.2 kg of solid ethyl alcohol at -211°C to liquid at 50.0°C? 2419 a°C The specific heat of solid ethyl alcohol is kg °C. The specific heat of liquid ethyl alcohol is kg °C. Show your work. Use the latent heat table shown below or press here. Latent Heats of Various Substances Substance Latent Heat of Melting Point (°C) Latent Heat of Boiling Point |(°C) Fusion Vaporization 2 519 6.6x105 1.1x10 1.8x105 1.1x10 Aluminum 4.0x105 10 900 Ethyl alcohol Carbon dioxide -114 8.6x10 78.3 -78 5.7x105 -57 Gold 1948 6.4x10 2 700 Lead 2.5x10* 327.5 8.7x10 1 750 Water 3.4x105 2.3x106 100

Block A rests on a horizontal tabletop. A light horizontal rope is attached to it and passes over a pulley, and block B is suspended from the free end of the rope. The light rope that connects the two blocks does not slip over the surface of thè pulley (radius 0.080 m) because the pulley rotates on a frictionless axle. The horizontal surface on which block A (mass 3.70 kg) moves is frictionless. The system is released from rest, and block B (mass 6.00 kg) moves Part A What is the tension force that the rope exerts on block B? downward 1.80 m in 2.00 s. Express your answer with the appropriate units. HÁ TB = Value Units Submit Request Answer Part B What is the tension force that the rope exerts on block A? Express your answer with the appropriate units. HẢ 王新 TA= Value Units

A 10-cm-diameter cylinder contains argon gas at 10 atm pressure and a temperature of 50°C. A piston can slide in and out of the cylinder. The cylinder's initial length is 21 cm. 2500 J of heat are transferred to the gas, causing the gas to expand at constant pressure. Part A What is the final temperature of the cylinder? Express your answer with the appropriate units. Tfinal= 240 °C Submit Part B Correct Previous Answers What is the final length of the cylinder? Express your answer with the appropriate units. final = Submit μA Value Units Previous Answers Request Answer ?

Equal masses of ice at -20 °C and water at 80 °C are mixed together. On the graph below draw lines for the temperature of the ice and the water as a function of time until they reach thermal equilibrium. Your graph should be qualitatively correct. Clearly label which line corresponds to the water and which corresponds to the ice. Briefly, explain your plots. Temperature time

Answer question 6please. Make sure it’s correct and explain the steps please.

Suppose we have 32.04g of water into which heat is transferred. If the initial temperature was 13.09 °C and the final temperature is 68.25 °C, how much heat has been added in units of Joules? Note: In the space below, please enter you numerical answer. Do not enter any units. If you enter units, your answer will be marked as incorrect. |

URGENT A cup of chocolate is initially at 170 ° F and is left in a room that has an ambient temperature of 70 ° F. Suppose that from time ? = 0 it is cooled at the rate of 20 ° F per minute. a) Write an initial value problem that models the temperature of hot chocolate. b)How long does it take for hot chocolate to cool down to a temperature of 110 ° F?