A buzzer with frequency f0 is thrown straight upwards. On the buzzer's trip down, what is the frequency behavior heard by an observer below?
a. The frequency heard is still f0.
b. The frequency is a constant one greater than f0.
c. The frequency is an increasing one greater than f0.
d. The frequency is a decreasing on less than f0.
C
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The _____ occurs when some of the energy in the convective motion of gas is converted into magnetic field energy
a. meridional flow b. Maunder minimum c. dynamo effect d. reconnection event e. Zeeman effect
A 25-kg block on a horizontal surface is attached to a light spring (force constant = 8.0 kN/m). The block is pulled 10 cm to the right from its equilibrium position and released from rest. When the block has moved 2.0 cm toward its equilibrium position, its kinetic energy is 12 J. What is the change in mechanical energy caused by the frictional force on the block as it moves the 2.0 cm?
a. ?4.0 J b. ?3.5 J c. ?2.4 J d. ?2.9 J e. ?15 J
The strong force is mediated by:
a. the gluon. c. the W+ boson. b. the W– boson. d. All of these choices.
Which of the following is not a fundamental force?
A) strong force B) weak force C) degeneracy pressure D) electromagnetic force E) gravity