You are traveling at 55 mi/h along the +x-axis relative to a straight, level road and pass a car that is traveling at 45 mi/h. The relative velocity of your car to the other car is
A) -10 mi/h.
B) 10 mi/h.
C) 65 mi/h.
D) 35 mi/h.
B
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Simple Harmonic Motion: The position of an air-track cart that is oscillating on a spring is given by the equation x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0.00 s is the cart first located at x = 8.47 cm?
A. 4.34 s B. 0.108 s C. 0.129 s D. 7.39 s E. 7.75 s
A cylinder of weight W1 5 150 lb is supported at two points, 1 and 2, as shown. Neglect friction at the two points of contact. Normal forces N1 and N2 are (in lb):
(A) 75, 130
(B) 130, 75
(C) 125, 150
(D) 75, 120
When we say that the electromagnetic and weak forces "freeze out" from the electroweak force at 10-10 seconds after the Big Bang, we mean that
A) these forces are important only at temperatures below the freezing point of water—a temperature that the universe reached at an age of about 10-10 second. B) "freezing out" was a term coined by particle physicists who think that the Big Bang theory is really cool. C) prior to this time the electromagnetic and weak forces maintained a single identity, but they possessed separate identities following this time. D) following this time neither the electromagnetic nor the weak force was ever important in the universe again. E) quantum fluctuations by high-speed, relativistic particles in a state of false vacuum cause disturbances in the spacetime continuum, leading to the process described in the question this answer refers to.
A steam engine is operating at its theoretical maximum efficiency of 60%. If the waste heat has a temperature of 100°F (38°C), what is the temperature of the boiler?
A. 350°C B. 94°C C. 225°C D. 504°C E. 775°C