If helium nuclei and protons are each accelerated from rest through the same potential difference, how do the resulting speeds compare?
A. the protons attain twice the speed of the helium nuclei
B. the protons attain 1.4 times the speed of the helium nuclei
C. the helium nuclei attain twice the speed of the protons
D. the helium nuclei attain 1.4 times the speed of the protons
E. they both attain the same speed
B. the protons attain 1.4 times the speed of the helium nuclei
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Muons at speed 0.9995c are sent round and round a circular storage ring of radius 550 m. If a muon at rest decays into other particles after an average T =2.2 × 10^?6 s, how many trips around the storage ring do we expect the 0.9995c muons to make before they decay?
a. 1 b. 2 c. 12 d. 6 e. 131
A baseball batter hits an incoming 45.0-m/s fastball. The ball leaves the bat at 56.0 m/s after a ball-on-bat contact time of 0.040 s. What is the force exerted on the 0.25-kg baseball?
a. 631 N b. 68.8 N c. 350 N d. 16.2 N e. 281 N
The person who first explained the discrete hydrogen atom spectrum was
a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg
A rocket speeding by the Earth is known, when at rest, to be roughly cylindrical with a radius of 15 m and a length of 150 m. When speeding by, its volume is measured to be 
What is its speed?
A. 0.917c B. 0.774c C. 0.678c D. Insufficient information is given.