A car and a truck are both travelling at the speed limit of 60kilometers per hour but in opposite directions. The truck hastwice the mass of the car. The vehicles collidehead-on and become entangled together. Required:
a. During the collision, how does the force exerted by thecar on the truck compare with the force exerted by the truck on thecar? Explain.
b. In what direction will the entangled vehicles move aftercollision, or will they be stationary? Support your answer, referring to a physics principle.
c. Determine hte speed (in kilometers per hour) of thecombined wreck immdeiately after the collision.
d. How does the acceleration of the car compare with theacceleration of the truck during the collision? Explain.
e. Both the car and truck drivers are wearing seat belts. Which driver is likely to be more severly jolted in the collision?Explain.
f. The total kinetic energy of the system decreases as aresult of the collision. Is the principle of conservation of energyviolated?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field. it is in the opposite direction from that of the original external field. it has a direction determined entirely by the charge on its surface. it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0