If the inner accretion disk around a black hole has a temperature of 10^6 K, at what wavelength will it radiate the most energy? (Hint: From Wien's law, ?T =3,000,000 where ? is in nm and T is in K.)
a. 10^6 nm
b. 3 nm
c. 3 × 10^6 nm
d. 1 nm
e. 3 × 10^11 nm
b
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A force is a vector quantity because it has both
A) magnitude and direction. B) mass and velocity. C) action and reaction counterparts. D) speed and direction.
An auto weighing 3000 newtons has a forward drive force of 1000 newtons. Air resistance on the car is 100 newtons, and road resistance is 100 newtons. The auto moves along a straight level road. The net force on this auto is
A) 200 newtons backward. B) 1000 newtons forward. C) 800 newtons backward. D) 1200 newtons forward. E) 800 newtons forward.
Consider a situation where two moving objects collide and rebound from each other.Linear momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved, depending on the nature of the collision. d. none of the above
A small sphere of initial volume V is filled with n moles of helium at initial pressure and temperature P and T. Which of the following statements is true?