6. an unknown material has a normal melting/freezing point of 225.0 °c, and the liquid
phase has a specific heat capacity of 160 j/(kg? cº). one-tenth of a kilogram of the solid
at 225.0 c is put into a 0.150-kg aluminum calorimeter cup that contains 0.100 kg ot
glycerin. the temperature of the cup and the glycerin is initially 27.0 °c. all the
unknown material melts, and the final temperature at equilibrium is 20.0 °c. the
calorimeter neither loses energy to nor gains energy from the external environment.
what is the latent heat of fusion of the unknown material?
(5)

1. consider the case in which air fills air shocks on a truck trailer. the pressure in the shocks is 2 mpa. the temperature is 300 k. the diameter of the shock piston is 10 cm and the initial length of the cylindrical cavity containing the compressed air is 40 cm. a. the truck is gradually loaded over a period of a day in a static setting. the temperature is held constant for the atmosphere and thus for the gas shock. calculate the compressibility of the air in the shock for this condition when the truck is initially being loaded. b. if the shocks were loaded in a dynamic setting by driving over bumps, what would be the compressibility? state your assumption. c. what is the initial load on the shock if the shock is in an atmospheric 100 kpa? d. if the shock is compressed using the process described in part a, and the air shock compressed air cavity length decreases to 20 cm, what is the additional load applied to the shock?

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c.the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat