A bat emits a sound at a frequency of 30.0 kHz as it approaches a wall. The bat detects beats such that the frequency of the echo is 900 Hz higher than the frequency the bat is emitting
What is the speed of the bat? The speed of sound in air is 340 m/s.
A)
20.0 m/s
B)
15.0 m/s
C)
10.0 m/s
D)
30.0 m/s
E)
5.0 m/s
E
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A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity increases to 40 rad/s. Assume that the angular acceleration was constant during the 5.0-s interval. How many revolutions does the wheel turn through during the 5.0-s interval?
A. 20 rev B. 24 rev C. 32 rev D. 28 rev E. 39 rev
The magnetic field lines of a bar magnet
A. emerge from the north pole and go back into the north pole B. emerge from the north pole and go into the south pole C. emerge from the south pole and go back into the south pole D. emerge from the south pole and go into the north pole
The half-life of a radioactive isotope is
A) half the time that it takes for a radioactive isotope to eat a large pizza. B) half the time required for the decay of a large sample of nuclei of that isotope. C) half the time required for a nucleus of that isotope to decay. D) the time required for the decay of half of a large sample of nuclei of that isotope. E) the time required for a nucleus of that isotope to partially decay.
A helicopter descends from a height of 600 m with uniform negative acceleration, reaching the ground at rest in 5.00 minutes. Determine the acceleration of the helicopter and its initial velocity