A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The impedance is
a. 4.68 ?.
b. 8.84 ?.
c. 10.0 ?.
d. 13.4 ?.
e. 18.8 ?.
d
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A puck with a mass m1 = 50 g moving at 1.0 m/s approaches a stationary puck with a mass m2 = 100 g on a frictionless air table,
and they undergo a sudden two-dimensional elastic collision. After the collision, both pucks have identical speeds, but travel in different directions. What is the angle between the original and final paths of puck with mass m1? A) 30° B) 60° C) 90° D) 120° E) 150°
What is the quark structure of a neutron?
a. uud b. udd c. uuu d. ddd e. the question does not make sense
A radioactive material initially is observed to have an activity of 1 600 decays/s. If six hours later it is observed to have an activity of 400 decays/s, what is its half-life?
a. six hours b. three hours c. twelve hours d. seven hours e. not enough information
A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 × 10^?6 m, how many photons are in each pulse?
a. 2 × 10^25 b. 2 × 10^21 c. 3 × 10^18 d. 6 × 10^38 e. 2 × 10^18