Suppose you're on a hot air balloon ride, carrying a buzzer that emits a sound of frequency f. If you accidentally drop the buzzer over the side while the balloon is rising at constant speed, what can you conclude about the sound you hear as the buzzer falls towards the ground?
1.The frequency and intensity increase.
2.The frequency decreases and the intensity increases.
3.The frequency decreases and the intensity decreases.
4.The frequency remains the same, but the intensity decreases.
3
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Which of the following is not a unit of work?
A) Kg-m/s B) J C) Kw-h D) N-m E) W-s
During a new Moon, when the Sun and the Moon are on the same side of the Earth, the people who live next to the ocean will see about how many high tides per day?
A. One B. Two C. Three D. Four
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 ?T 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
Consider a wire in a magnetic field, as shown in the following figure, with a current flowing through it. What will happen to the wire?
a.
The wire will be forced toward the north pole.
b.
The wire will be forced perpendicular to the plane of the magnetic field.
c.
The current will cease flowing.
d.
Nothing will happen.