A car's initial velocity is 50.0 km/h in the direction 60.0° north of east, and its final velocity is 70.0 km/h in the direction 40.0° south of east. If the time period for this journey is 30.0 minutes, what is the magnitude of the car's average acceleration?
a. 186 km/h/h
b. 240 km/h/h
c. 92.8 km/h/h
d. 3.94 km/h/h
a
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While we may never be able to prove that our Moon really formed in a giant impact, which of the following would give scientists greater confidence that the model is correct?
a. Creating more sophisticated models of the giant impact that correctly predict many detailed characteristics of the Earth and Moon. b. Smashing together two glass marbles in a laboratory and then gluing the remnants together to make marbles that have the same size ratio as the Earth and Moon. c. Finding evidence that other giant impacts occurred in our solar system, with a total number of impacts consistent with what models of solar system formation lead us to expect. d. Observing evidence of recent giant impacts in other solar systems that are currently in the process of formation. e. Having the giant impact model endorsed by a dozen Nobel prize winners.
A ball of mass mB is released from rest and acquires velocity of magnitude vB before hitting the ground. The ratio of the magnitude of the momentum the Earth acquires to the magnitude of the momentum the ball acquires is
A.
B.
.C.
.D.
E.
.Which of the following is a vector quantity?
A. volume B. force C. speed D. time E. length
A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the energy of the scattered photon?
A) 1.05 × 10-16 J B) 2.10 × 10-16 J C) 5.71 × 10-16 J D) 3.34 × 10-16 J E) 4.21 × 10-16 J