A star is 10 parsecs from Earth. Which statement is true?
A) The star's apparent magnitude is larger than its absolute magnitude.
B) The star is about 33 ly away.
C) The star's parallax is 1.0 arc seconds.
D) The star's apparent magnitude is smaller than its absolute magnitude.
E) The star is in a different galaxy.
B
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Einstein's equation E = mc2 describes the conversion of mass to energy that occurs during nuclear fusion. If a billion joules of energy are released by this process, how much mass has been consumed? (Recall, a joule is a Nt-m or kg-m2/s2 and the speed of light is ~300 million m/s.)
The surface temperature of Venus is 750K, even hotter than Mercury
Indicate whether the statement is true or false
A car is going around a racetrack at constant speed. The curves around the track have different radii. In which turn is the magnitude of the car's acceleration the greatest?
a. It is the greatest in the turn with the greatest radius. b. It is the greatest in the turn with the smallest radius. c. The acceleration is zero everywhere because of the constant speed. d. More information is needed to determine the answer.
In general, precession results when
A) torque acts on a body with zero angular momentum. B) the direction of torque acting on an object is parallel to the direction of angular momentum of the body. C) there is no torque acting on a body. D) the direction of torque acting on an object has a component perpendicular to the direction of angular momentum of the body. E) the direction of torque acting on an object is opposite to the direction of angular momentum of the body.