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.
Answer: C
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A 320-kg satellite experiences a gravitational force of 800 N. What is the radius of the satellite's orbit? (Earth's radius is 6,400 km.)
A. 6,400 km B. 12,800 km C. 19,200 km D. 25,600 km
In Ptolemy's view of the universe, a planet moves on an epicycle whose center moves around the Earth on the deferent circle
a. Correct
b. FALSE; Ptolemy put the Sun at the center.
c. FALSE; The planet stays on the deferent circle.
d. FALSE; The Earth is at the center of the epicycle.
e. FALSE; Both c and d are correct.
A car is going past a radio station at a speed of 40.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?
A) 9.93 Hz B) 99.3 Hz C) 993 Hz D) 7.45 Hz E) 74.5 Hz
Which terrestrial planets lack seasons? Why?
What will be an ideal response?