A uniform rod of length (L = 2.0 m) and mass (M = 1.5 kg) is pivoted about a horizontal frictionless pin through one end. The rod is released from rest at an angle of 30° below the horizontal. What is the angular speed of the rod when it passes through the vertical position? (The rotational inertia of the rod about the pin is 2.0 kg/m2.)
a. 3.5 rad/s
b. 2.7 rad/s
c. 3.1 rad/s
d. 2.3 rad/s
e. 1.6 rad/s
b
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Indicate whether the statement is true or false
When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches a distance d. The mass is now displaced from its equilibrium position and undergoes 100 oscillations in 48.9 s. What is the stretch distance d?
A) 2.35 cm B) 2.97 cm C) 4.71 cm D) 5.94 cm E) 6.28 cm
A 0.140-kg baseball is dropped from rest from a height of 2.20 m above the ground and experiences negligible air resistance as it falls. It rebounds to a height of 1.60 m. What change in the ball's momentum occurs as it rebounds from the ground?
A) 0.117 kg ? m/s upwards B) 0.117 kg ? m/s downwards C) 1.70 kg ? m/s upwards D) 0.350 kg ? m/s upwards E) 0.350 kg ? m/s downwards
Excited atomic states that last for a relatively long time are called
A. laser states. B. metastable states. C. amplification states. D. radiation states. E. cascading states.