Impulse: A 0.140 kg baseball is thrown horizontally with a velocity of 28.9 m/s. It is struck with a constant horizontal force that lasts for 1.85 ms, which results in a velocity of 37.0 m/s in the opposite direction. What was the magnitude of the horizontal force?
A. 0.613 kN
B. 2.19 kN
C. 2.80 kN
D. 4.99 kN
Answer: D
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Grandfather clocks often are built so that each one-way swing of the pendulum is a second. How long is the length of a simple pendulum for a 2.00 second period?
A) 0.993 m B) 24.8 cm C) 101.cm D) 0.500 m E) 500. cm
Reactance: In the circuit shown in the figure, the 60-Hz ac source has a voltage amplitude of 120 V, the capacitive reactance is 820 ?, the inductive reactance is 330 ?, and the resistance is 550 ?. What is the capacitance C of the capacitor?
A. 3.2 µF B. 6.3 µF C. 9.4 µF D. 13 µF E. 20 µF
A waxing crescent Moon is visible
a. near the eastern horizon just before sunrise. b. near the eastern horizon just after sunset. c. near the western horizon just before sunrise. d. near the western horizon just after sunset. e. from sunset until sunrise.
In space, positive ions are the result of:
A) protons escaping from the nuclei of atoms at tremendous temperatures. B) electrons being stripped off the outer electron shell for hot atoms. C) positrons being added to the atomic nucleus at great energies. D) positrons being added to the electron clouds, destroying the electrons. E) electrons being added to the cloud, giving them a surplus over protons.