A simple pendulum, 2.0 m in length, is released from rest when the support string is at an angle of 25° from the vertical. What is the speed of the suspended mass at the bottom of the swing?
1.9 m/s
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An astronaut on the Moon drops a feather and a hammer at the same time. Which hits the ground first?
A. The hammer hits first due to its larger mass. B. The feather hits first since there is no air resistance on the Moon. C. The feather hits first due to the decreased weight of the hammer. D. The feather and the hammer hit the ground at the same time.
Superconductors can carry very large currents with no resistance. If a superconducting wire is formed into a solenoid of length 50.0 cm with 250 turns, what is the magnetic field inside the solenoid when the current is 104 A? (µ0 = 4p × 10^-7 T×m/A)
a. 12.6 T c. 1.25 T b. 2.50 T d. 6.28 T
An electron is in the ground state of an infinite well (a box) where its energy is 5.00 eV. In the next higher level, what would its energy be? (1 eV = 1.60 × 10-19 J)
A) 1.25 eV B) 10.0 eV C) 15.0 eV D) 20.0 eV E) 2.50 eV
When an unstable Nickel nucleus undergoes gamma decay, the nucleus formed is that of
a. Nickel. b. Zinc. c. Cobalt. d. Iron. e. Copper.