A 10-kg dog is running with a speed of 5.0 m/s. What is the minimum work required to stop the dog in 2.40 s?
A) 50 J
B) 75 J
C) 100 J
D) 125 J
D
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When a rocket is traveling toward a mountain at 100 m/s, the sound waves from this rocket's engine approach the mountain at speed V. If the rocket doubles its speed to 200 m/s, the sound waves from the engine will now approach the mountain at speed
A) 4V. B) 2V. C) V. D) V.
Apply Wein's law to explain the corona's main energy release
What will be an ideal response?
Polarization: Unpolarized light passes through a combination of two ideal polarizers. The transmission axes of the first polarizer and the second polarizer are at 30.0° to each other. What percentage of the original light gets through the combination?
A. 37.5% B. 50% C. 75% D. 100%
A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?
A) zero B) 0.15 N C) 0.30 N D) 0.60 N