Although stars much more luminous than our Sun have wider habitable zones, planets around them are unlikely to have developed life because high luminosity stars
A) have extremely short lifetimes of the order of millions of years
B) are not expected to form rocky, terrestrial planets
C) emit very high levels of short wavelength radiation
D) are very unstable
A
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A hollow conducting sphere of radius 12 cm had a charge of
C placed on it. What is the potential at the center of the sphere?
A. 0 V
B. 24 V
C. 
D. 
E. infinite
Equilibrium: A 320-g ball and a 400-g ball are attached to the two ends of a string that goes over a pulley with a radius of 8.7 cm. Because of friction in its axle, the pulley does not begin to rotate. What is the magnitude of the frictional torque at the axle of the pulley if the system remains at rest when the balls are released?
A. 0.068 N ? m B. 0.61 N ? m C. 0.079 N ? m D. 0.063 N ? m E. 0.00070 N ? m
A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1500 m/s. A baseball has a mass of 0.145 kg. What must be its speed if the pitcher's claim is valid?
What will be an ideal response?
What is found in between the particles of a gas?
A) air B) nothing C) elements D) temperature