A protostar is not ________.
A. heating up
B. collapsing
C. in hydrostatic equilibrium
D. producing energy
Answer: C
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AC Generator: A rectangular coil of N turns, length L = 25 cm, and width w = 15 cm, as shown in the figure, is rotating in a magnetic field of 1.6 T with a frequency of 75 Hz. If the coil develops a maximum emf 56.9 V, what is the value of N?
A. 2 B. 4 C. 6 D. 8 E. 10
Buoyancy: A solid sphere of mass 8.6 kg, made of metal whose density is 3400 kg/m3, hangs by a cord. When the sphere is immersed in a liquid of unknown density, the tension in the cord is 38 N. The density of the liquid is closest to which one of the following values?
A. 1900 kg/m3 B. 1700 kg/m3 C. 1600 kg/m3 D. 1500 kg/m3 E. 1400 kg/m3
Using the correct answer from Part B, calculate the volume of a rectangular prism with a length of 5.6 cm, a width of 2.1 cm, and a height of 6.6 cm.
The main purpose of the condenser in the steam cycle of a steam turbine is to
A) cool the steam. B) condense the steam. C) lower pressure on the back side of the turbine blades. D) maintain high efficiency. E) change mechanical energy to electricity.