Two masses m1 and m2, with m1 > m2, have momenta with equal magnitudes. How do their kinetic energies compare?
a. KE1 < KE2
c. KE1 > KE2
b. KE1 = KE2
d. More information is needed.
A
You might also like to view...
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
a. nR ln (V2/V1) b. nRT ln (V2/V1) c. nk ln (V2/V1) d. 0 e. nR V2/V1
A bullet shot straight up returns to its starting point in 10 s. Its initial speed was
A) 98 m/s. B) 49 m/s. C) 9.8 m/s. D) 24.5 m/s. E) 32. ft/s.
How much energy is needed to change the speed of a 1600 kg sport utility vehicle from 15.0 m/s to 40.0 m/s?
A) 1.10 MJ B) 10.0 kJ C) 0.960 MJ D) 20.0 kJ E) 40.0 kJ
A brass bar (E 5 110 MPa) of length L 5 2.5 m has diameter d1 5 18 mm over one-half of its length and diameter d2 5 18 mm over the other half. Compare this nonprismatic bar to a prismatic bar of the same volume of material with constant diameter d and length L. The elongation of the prismatic bar under the same load P 5 25 kN is approximately:
(A) 3 mm
(B) 4 mm
(C) 5 mm
(D) 6 mm
