The current in a coil with a self-inductance of 1.5 mH increases from 0 to 2.0 A in a tenth of a second. What is the induced emf in the coil?
a. 15 mV
c. 0.10 V
b. 0.30 V
d. 30 mV
D
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What was Tycho Brahe's contribution to astronomy? a. He proved that Earth rotates on its own axis and revolves around the Sun
b. He designed the three laws of planetary motion. c. He discovered satellites around Jupiter, which proved Earth could move and keep its satellite. d. He described why each of the planets moved in uniform circular motion. e. He compiled detailed observations of the positions of the Sun, Moon, and planets over a period of 20 years.
Mass on a Spring: A 4.8-kg block attached to an ideal spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0.00 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2. The force constant (spring constant) of the spring is closest to
A. 15 N/m. B. 14 N/m. C. 13 N/m. D. 12 N/m. E. 11 N/m.
Neglecting gravity, doubling the exhaust velocity from a single stage rocket initially at rest changes the final velocity attainable by what factor? Assume all other variables, such as the mass of the rocket and the mass of the fuel, do not change
a. The final velocity stays the same. b. The final velocity doubles. c. The final velocity increases by a factor of 0.693. d. The final velocity increases by a factor of 0.310.
Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?
A) The resistance of wire #1 is twice as high as that of wire #2. B) The resistance of wire #1 is equal to that of wire #2. C) The resistance of wire #1 is half that of wire #2. D) The resistance of wire #1 is four times higher than that of wire #2.