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 moment of 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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An observer is moving in space toward a distant star at 50.0 km/s while the star is moving toward the observer at 180 km/s; the relative velocity being 230 km/s of approach. What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10^5 km/s)
a. 0.077% increase b. 0.077% decrease c. 0.026% increase d. 0.23% decrease e. 0.23% increase
You and Mae are in free-float frames. Mae has just passed you, traveling at a speed of 60 km/hr. You throw a ball toward her at a speed of 60 km/hr. What will Mae see the ball doing?
A) She'll see the ball coming toward her at 60 km/hr. B) The ball will be stationary, floating freely in her own reference frame. C) She'll see the ball moving away from her at 60 km/hr. D) She'll see the ball coming toward her at 120 km/hr.
Consider a situation where two moving objects collide and rebound from each other.Linear momentum is definitely conserved
a. True b. False Indicate whether the statement is true or false
"Net force" means the vector sum of all the individual forces acting on a particular body
Indicate whether the statement is true or false