Which of the following is not a fundamental force?
a. the gravitational force
b. the electromagnetic force
c. the strong force
d. the force of forward motion also known as the inertial force
e. Choose this answer if two of the named forces are not fundamental.
d
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Freely falling bodies experience
a. motion with constant velocity b. motion with zero acceleration c. motion with constant acceleration d. motion at a constant speed e. none of the above
A 12-kg mass is placed on a 25.0° incline, and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520 . What is the frictional force in this situation?
a. 55.4 N c. 49.7 N b. 107 N d. 61.2 N
A 100-W light bulb is in a socket supplied with 120 V. What is the current in the bulb?
a. 7200 A c. 1.4 A b. 0.83 A d. 0.50 A
Which of the following statements is an inference from a model (rather than an observation)?
A) The Sun emits neutrinos. B) The photosphere emits visible light. C) The photosphere is made out of mainly hydrogen and helium. D) The corona is hotter than the photosphere. E) The Sun's core is gradually turning hydrogen into helium.