Cracking the SAT Physics Subject Test
Chapter 21 Practice Test 2: Answers and Explanations ...
PRACTICE TEST 2 ANSWER KEY ...
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PRACTICE TEST 2 EXPLANATIONS D As the block moves up and down, its position changes. 2. B According to the equation for the fre ...
B When a nucleus undergoes β− decay, a neutron is converted into a proton and an electron, and the electron is ejected. Because ...
D Since the rays first reflect and then converge as they exit the box, this ray diagram is consistent with having a plane mirro ...
is about twice that for a proton and thousands of times greater than that of an electron or positron. B The magnetic field line ...
, we see that we can solve for L if we know T (since g is known). B Because the block moves in a circular path, it must experie ...
energy (speed). The direction the proton is traveling is changing; however, since there is zero work, there is no change in spee ...
However, since F 2 = −F 1 , (C) is true; one possible illustration of this is given below. ...
B The cylinder slides across the surface with acceleration a = F/m until time t = T, when a drops to zero (because F becomes ze ...
D As the box slides down the track, it loses height, so it loses gravitational potential energy. The quantities in (A), (B), an ...
B Since the velocity does not change, the acceleration of the box is zero, so the net force the box feels must also be zero. Si ...
B Perhaps the easiest way to answer this question is to choose a numerical value for the distance between X and Y. Let’s choose ...
E Use the equation that relates wavelength, frequency, and wave speed. v = λf = (0.5 m)(6.0 Hz) = 3.0 m/s A With switch S 2 c ...
E By definition of an isolated system, (A), (B), (C), and (D) are all false. The second law of thermodynamics tells us that in ...
D Let M be the mass of the sun, MJ the mass of Jupiter, and ME the mass of Earth. In addition, let RJ denote the distance from ...
their path lengths from the slits is an odd number of half wavelengths. Only the equation in (A) satisfies this requirement. C ...
E The frequency determines the pitch of a sound, and the amplitude determines the intensity (or loudness). Pitch and loudness a ...
(m)(−v sin60°). Since the total vertical momentum after the collision is zero, we find that B If the collision is elastic, then ...
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