The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the mean life (time constant) of this sample?
What will be an ideal response?
6.91 s
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A voltage has been applied across a capacitor. If the dielectric is replaced with another dielectric constant eight times as great and the voltage is reduced to half of what it was, the ENERGY STORED in the capacitor is how many times the original
stored energy? A) 4 B) 1/4 C) 8 D) 1/2 E) 2
How is the energy stored in a current-carrying inductor related to its self-inductance, L?
a. directly proportional to L1/2 c. inversely proportional to L b. directly proportional to L d. directly proportional to L2
The SI units for k, the spring constant, are equivalent to:
a. J. b. J / N. c. kg / s2. d. None of the above.
General Questions: A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is
A. 1500 N. B. 24,000 N. C. 6000 N. D. 12,000 N. E. We need to know if the car is accelerating to answer this question.