During the nuclear fusion of hydrogen to helium in the core of our Sun, what percentage of the original mass of the hydrogen is converted into energy?
A) 0.7%
B) 0.07%
C) 70%
D) 100%
Answer: A) 0.7%
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A crate sits on the ground. You push as hard as you can on it, but you cannot move it. At any given time when you are pushing, what is the magnitude of the static friction force exerted on the crate by its contact interaction with the ground compared to the magnitude of your push (which is a normal force)? (Hints: What is the crate’s acceleration? Draw a free-body diagram.)
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
Causing an object to start moving on a frictional surface requires
A. less force than is needed to keep it moving on the surface. B. the same force as is needed to keep it moving on the surface. C. more force than is needed to keep it moving on the surface. D. a force equal to the weight of the object. E. a force opposite to the normal force.
Each atom in a mole of water vapor (H2O) has one electron removed. What is the total charge of the ionized gas?
A. 96 kC B. 290 kC C. 600 kC D. 190 kC
The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77 kg laboratory technician absorbs 2.3 mJ of 0.5 MeV gamma rays in a work day. The relative biological efficiency (RBE) for gamma rays is 1.00
The number of gamma-ray photons absorbed by the technician in a workday is closest to: A) 3 × 1010 B) 3 × 109 C) 3 × 108 D) 1 × 109 E) 1 × 108