Assuming negligible friction, what spring constant would be needed by the spring in a "B-B gun" to fire a 10-g pellet to a height of 100 m if the spring is initially compressed by 0.10 m?
A) 20 N/cm
B) 20 N/m
C) 200 N/m
D) 2000 N/cm
E) 0.0020 N/m
A
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The average heat transfer per unit area is 100 W/m2 between saturated vapor R-134a and a tube. The R-134a is at 50ºC and flows at 0.5 kg/s through a 1-cm-diameter horizontal tube having average surface temperature of 20ºC. The R-134a is to be completely condensed when it leaves the tube. Estimate the tube length required, using hnfg = 205.9 kJ/kg for R-134a at 500C.
What will be an ideal response?
If the input to an RLC series circuit is 
, then the current in the circuit is
A.
.B.
.?C.
.D.
.E.
.You push your physics book across your desk, leaving the book at rest on the desk at the end of the process. Which of the following best represents the overall energy conversion during this process?
A) kinetic to thermal B) thermal to chemical C) chemical to electromagnetic D) chemical to thermal E) elastic to thermal
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every DT, no matter how large or how small DT is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature. b. Neither, because a change of state may involve release or absorption of latent heat. c. Neither because a substance may do work during a temperature change. d. All of the statements above are correct. e. Only statements (a) and (b) are correct.