Tidal forces are important to the Algol system today but were not important when both stars were still on the main sequence. Why not?
A) Main-sequence stars in a system like the Algol system are small compared to their physical separation.
B) Main-sequence stars are too big to be affected by tidal forces.
C) Main-sequence stars are too massive to be affected by tidal forces.
D) Main-sequence stars are unaffected by tidally induced mass transfer.
A) Main-sequence stars in a system like the Algol system are small compared to their physical separation.
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Light from an astronomical source is found to be shifted to a one percent lower frequency than had the source been at rest. What radial velocity could cause such a shift?
A. 
m/s moving away from the observer
B. 
m/s moving away from the observer
C. 
m/s moving toward the observer
D. 
m/s moving toward the observer
E. 
m/s moving away from the observer
The Schwartzschild radius for a 12 solar mass star is
A) 4 km. B) 15 km. C) 36 km. D) 100 km. E) 3000 km.
Carburetors in NASCAR race cars make use of Bernoulli's principle
a. True b. False Indicate whether the statement is true or false
A series circuit consists of ac source, a 90-? resistor, a 0.80-H inductor, and an 80-?F capacitor
The frequency of the source is adjusted so that the capacitive reactance is equal to twice the inductive reactance. What is the frequency of the source? A) 14 Hz B) 13 Hz C) 16 Hz D) 17 Hz E) 19 Hz