Standing Waves on a String: A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?
A. 6.0 Hz
B. 12 Hz
C. 18 Hz
D. 24 Hz
E. 36 Hz
Answer: B
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The proton-proton chain needs high temperature because
a. of the ground state energy of the hydrogen atom. b. of the presence of helium atoms. c. the protons must overcome the Coulomb barrier. d. of the need for low density. e. the neutrinos carry more energy away than the reaction produces.
Projectile Motion: An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no significant air resistance?
A. 0.50 s B. 0.88 s C. 1.1 s D. 2.5 s E. 0.54 s
The pressure in a gas is the result of the momentum transfer that occurs when the molecules bounce from the walls of the container
Indicate whether the statement is true or false
A square loop of wire has a current going around it. The magnetic field from the current on each side of the loop results in a magnetic force on the wire on the opposite side. Each resulting magnetic force on the opposite side wire
a. pushes inward on the loop. b. is actually zero since a current cannot push on itself. c. depends on whether the current is clockwise of counterclockwise. d. pushes outward on the loop.