Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless, level surface. Attached to the 20-kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.50 m/s2 what is the tension in the connecting string between the blocks?
a. 14 N
c. 10 N
b. 6.0 N
d. 4.0 N
D
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From what cosmic epoch do the photons in the cosmic background radiation originate?
A) the end of the era of nuclei B) during the era of nucleosynthesis C) during the era of galaxy formation D) the end of the Planck era E) the moment of the Big Bang
A certain capacitor is charged to 10 V and then, at t = 0, allowed to discharge through a certain resistor. There will be a certain time before the voltage across the capacitor reaches 5 V. This time can be decreased for this circuit by increasing:
a. the size of the capacitor. b. the size of the resistor. c. the size of the time constant. d. None of the above.
44 g of petrified wood was found in a petrified forest. A sample showed a 14C activity of 100 decays/minute. How long has the tree been dead (in years)? (The half-life of carbon-14 is 5730 years and freshly cut wood contains 6.5 × 10^10 atoms of 14C per gram.)
a. 12 300 b. 15 600 c. 8 500 d. 4 700 e. 2 400
Arguably, the most important weathering agent is
What will be an ideal response?