A vertical wire carries a current vertically downward. To the east of this wire, the magnetic field points
A) north.
B) east.
C) south.
D) down.
C
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Explain how giant molecular clouds give rise to spiral tracers as they move through a disk with spiral density waves
What will be an ideal response?
A physical pendulum is composed of a disc whose center of gravity is attached to a thin rod. The disc has a moment of inertia of 1?2 MR2. The mass of the disc is 500 gm and has a radius of 4.00 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 1.24 sec. B. 1.42 sec. C. 1.74 sec. D. 1.90 sec. E. 2.25 sec.
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
The "energy efficiency" of a device is
A) the total energy put into the device divided by its useful energy output. B) its thermal energy output divided by the total energy put into the device. C) its total energy output divided by the total energy put into the device. D) its useful energy output divided by the total energy put into the device. E) the total energy put into the device divided by its thermal energy output.