Torque: The lug nuts on a car wheel require tightening to a torque of 90 N ? m. If a 30-cm long wrench is used, what is the magnitude of the minimum force required using the wrench?
A. 300 N
B. 150 N
C. 30 N
D. 15 N
Answer: A
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Which of the following is a form of radiation and not a form of matter?
A) an electric current flowing in a copper wire B) the electron beam that creates the picture on a TV tube C) carbon dioxide gas D) None of the above are forms of radiation. E) All of the above are forms of radiation.
A lawn mower has a 6-horsepower engine (1 HP = 750 W). If the engine has an efficiency of 20%, and the throttle is such that the engine cycles 10 times a second, the heat that is expelled in one cycle is
a. 1 800 J b. 2 000 J c. 2 200 J d. 2 400 J e. 2 250 J
A negatively-charged particle moves across a constant uniform magnetic field that is perpendicular to the velocity of the particle. The magnetic force on this particle
A) is in the same direction as the particle's velocity. B) causes the particle to slow down. C) causes the particle to speed up. D) is opposite the direction of the particle's velocity. E) causes the particle to accelerate.
A mass on a spring vibrates in simple harmonic motion at a frequency of 8.0 Hz and an amplitude of 2.0 cm. If a timer is started when its displacement is a maximum (hence x = 2.0 cm when t = 0), what is the speed of the mass when t = 3.0 s?
a. zero b. 100 m/s c. 3.0 m/s d. 2.0 m/s e. 50 m/s