A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. The magnitude of the acceleration of the ball while it is in flight is
A) 25 m/s2.
B) 20 m/s2.
C) 9.8 m/s2.
D) 8.4 m/s2.
E) 0 m/s2.
C
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An interstellar dust cloud may be very cold. What kind of telescope would we use to observe it at its strongest wavelength?
A. a space-based ultraviolet telescope B. a ground-based visible-light telescope C. a ground-based infrared telescope D. a ground-based X-ray telescope E. None of these choices are correct.
If the net force on an object is zero,
a. there must be no forces acting on the object. b. the object must be at rest. c. the object's acceleration must be zero. d. there can be no friction acting on the object.
Two of your classmates, each 82 kg, are separated by 4 meters. The gravitational force of attraction between them in nano-newtons is
a. 1.4 nN b. 0.3 nN c. 0.0 nN d. 41.2 nN e. 28.0 nN
Which of the following is an almost reversible process?
a. The explosion of hydrogen and oxygen to form water. b. Heat transfer through thick insulation. c. The adiabatic free expansion of a gas. d. A slow isothermal compression of a gas. e. A slow leakage of gas into an empty chamber through a small hole in a membrane.