The total force needed to drag a box at constant speed across a surface with coefficient of kinetic friction mk is least when the force is applied at an angle q such that
a. sinq = mk.
b. cosq = mk.
c. tanq = mk.
d. cotq = mk.
e. secq = mk.
C
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The horizontal acceleration of a projectile
a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases
Combining two sounds of equal intensity will give a sound level ___________ than the sound level due to just one of them
a. twice as loud b. 3 dB higher c. 10 dB higher d. 2 dB higher
Simple harmonic oscillations can be modeled by the projection of circular motion at constant angular velocity onto a diameter of the circle. When this is done, the analog along the diameter of the acceleration of the particle executing simple harmonic motion is
a. the displacement from the center of the diameter of the projection of the position of the particle on the circle. b. the projection along the diameter of the velocity of the particle on the circle. c. the projection along the diameter of tangential acceleration of the particle on the circle. d. the projection along the diameter of centripetal acceleration of the particle on the circle. e. meaningful only when the particle moving in the circle also has a non-zero tangential acceleration.
A uniform rod (mass m = 1.0 kg and length L = 2.0 m) pivoted at one end oscillates in a vertical plane as shown below. The period of oscillation (in s) is approximately
?
?
a.
4.0.
b.
1.6.
c.
3.2.
d.
2.3.
e.
2.0.