Which of the following correctly describes the rate of conductive heat transfer for a substance? a. The rate decreases with increased surface area and decreased thickness.  b. The rate increases with increased temperature difference and surface area.  c. The rate increases with decreased temperature difference and increased thickness.  d. The rate decreases with decreased temperature difference and increased surface area.

Choose the correct answer 1. You have a 90 cm long iron rod at 15 ° C that heats up to 300 ° C. What happens with the rod is that: A. It melts. B. Double the length. C. Decrease its length a few centimeters. D. Increase its length by a few millimeters. 2. A student blows up a balloon and places it in his home freezer. After a long time, the balloon is removed from the freezer and it is observed that: A. The volume decreases as a certain amount of air escapes. B. It remains the same, because the air inside it does not expand or contract. C. The volume increases, because the air inside it expands D. The volume decreases as the air inside it contracts

The heat conducted through a bar depends on which of the following? A. The coefficient of linear expansionB. The thermal conductivityC. The specific heat capacityD. The length of the barE. The cross-sectional area of the bar     A, C, and D   A, B, and D   B, C, D, and E   B, D, and E   C, D, and E

Double-glazed windows are usually made of two glass panes with a thin layer of air sealed between the panes.  a. Why do these windows reduce heat loss to a much greater extent than occurs if the double glazing is replaced by a thicker glass instead? b. Why does the insulating effect of the double glazing decrease if the two glass panes are too far apart? Explain.

4. Ideal Gas Type Question: A piston comprises two nested cylinders which are 3 cm and 2.8 cm in diameter with 0.1 cm thick walls and are each 1 m long. Initially, the smaller cylinder sits completely inside the larger cylinder and is filled with N2 at 20 °C and atmospheric pressure. a. C. The gas is slowly heated, while the cylinder is allowed to freely expand. What kind of process is this? banc b. The smaller cylinder has a total mass of 1.5 kg. What temperature does the gas need to be for the cylinder to become fully extended? The cylinder can withstand an internal pressure of 20 atm. What's the maximum weight it can lift? e. d. A 100 kg weight is dropped on the cylinder while it is fully extended, causing it to rapidly compress. What kind of process is this? If the cylinder is fully depressed by this event, what is the peak pressure? The adiabatic constant for N2 is 7/5. f. If the weight is dropped from 2 m, assuming 1% of its energy is converted into thermal energy in the gas,…

3. 120 grams of water are heated from zero degrees Celsius to 30.0 degrees Celsius. Which expression should be used to determine the amount of calories added to the water to do this? The latent heat of fusion of ice is 79.7 cal/gram, and the specific heat of water is 1 cal/gramCo.   a. 120   b. 120 x 1 x 30   c. 120 x 79.7   d. 30 divided by 120   e. 120 divided by 30

Water vapor at 100 degrees Celsius is put in contact with ice at 0 degrees Celsius and this mixture eventually results in 45 kg of liquid water at 30 degrees Celsius.  A. How many kilograms of ice were part of the mixture? B. How many kilograms of steam were part of the mixture?