A small airplane with a wing span of 12 m flies horizontally and due north at a speed of 60 m/s in a region where the magnetic field of the earth is 60 mT directed 60° below the horizontal. What is the magnitude of the induced emf between the ends of the wing?
a. 50 mV
b. 31 mV
c. 37 mV
d. 44 mV
e. 22 mV
C
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Streak Luster Hardness
Three cars with identical engines and tires start from rest, and accelerate at their maximum rate. Car X is the most massive, and car Z is the least massive. Which car needs to travel the furthest distance before reaching a speed of 60 mi/h?
A) Car X B) Car Y C) Car Z D) All cars need to travel the same distance, although some cars will take longer than other cars.
When a 12.0 volt battery is connected to a 6.00 ?F capacitor:
(a) how much energy is stored? (b) how much charge is stored on the positive plate of the capacitor?
Why must the Sun's rate of fusion gradually rise over billions of years?
A) The Sun becomes less efficient and must increase the rate of fusion to produce the same amount of energy. B) Fusion reactions decrease the overall number of particles in the core, causing the core to shrink, converting gravitational potential energy into thermal energy, and increasing the rate of fusion. C) The radiation produced by fusion reactions that is trapped in the core gradually raises the temperature, increasing the rate of fusion. D) The Sun gets heavier as it gets older, and the stronger inward pull of gravity increases the fusion rate. E) The rate of fusion is not rising; it is actually decreasing over time.