Sara lies on a bed of sharp nails without harm because
A) many of the nails don't make contact with her body.
B) her weight is distributed over hundreds of nails.
C) she exercises mind over matter.
D) none of the above
Answer: B
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Both the CNO cycle and the proton-proton fusion chain convert hydrogen to helium using catalysts
a. True b. False Indicate whether the statement is true or false
Apart from the effects of other planets, the orbit of Mercury precesses because
A) Mercury travels faster than any other planet. B) Mercury's orbit is nearly circular. C) of pronounced variations in Mercury's orbit about the Sun.
Graphical Interpretation of Work: A force acts on an object, causing it to move parallel to the force. The graph in the figure shows this force as a function of the position of the object. How much work does the force do as the object moves from 0 m to 4 m?
A. 20 J B. 30 J C. 0 J D. 40 J E. 70 J
A turntable has a moment of inertia of 3.0 × 10^?2 kg·m2 and spins freely on a frictionless bearing at 25 rev/min. A 0.60-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.10 m from the center. By what factor does the kinetic energy of the system change after the putty is dropped onto the turntable?
a. 0.91 b. 1.0 c. 0.83 d. 1.5