A car with bad shocks bounces up and down with a period of 1.50 s after hitting a bump. The car has a mass of 1250 kg and is supported by four springs of force constant k. What is k for each spring?
a. 6580 N/m
c. 4440 N/m
b. 5480 N/m
d. 3630 N/m
B
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A sprinter runs 100.0 m. If he travels at constant acceleration of 1.95 
for the first 75.0 m and then at constant velocity for the remaining distance, what was his total elapsed time for the whole race?
A. 11.3 s B. 9.8 s C. 10.1 s D. 10.2 s
If a radioactive isotope with a half-life of 5 hours is injected into your bloodstream for medical imaging purposes, how many hours do you have to wait before the amount of this isotope in your body is 1/16 its original amount?
A) 15 B) 10 C) 25 D) 5 E) 20
When an astronaut experiences weightlessness in space, their mass is
A. zero. B. becoming lesser and lesser as s/he is going higher. C. the same as on Earth. D. double than on Earth.
A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?
A) upward B) northward C) southward D) eastward E) westward