A 0.50-kg box is attached to an ideal spring of force constant (spring constant) 20 N/m on a horizontal, frictionless floor. The box oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position
(a) What is the amplitude of vibration?
(b) At what distance from the equilibrium position are the kinetic energy and the potential energy the same?
(a) 0.24 m (b) 0.17 m
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The magnetic field of a plane progressive electromagnetic wave in a vacuum is given by Bz = Bocos(ky - ?t). What is the corresponding expression for the electric field?
A) Ex = cBosin(ky - ?t) B) Ex = - cBocos(ky - ?t) C) Ez = cBosin(ky - ?t) D) Ex = cBocos(ky - ?t) E) Ex = - cBosin(ky - ?t)
Black holes erupt when matter flows into their accretion disk
a. True b. False Indicate whether the statement is true or false
How are standard candles used to measure distance?
What will be an ideal response?
In attempting to find the missing matter that seems to be required to explain observed properties of galaxies and clusters, astronomers have been able to rule out which populations?
A. weakly interacting massive particles B. hot and cold gas C. black holes D. dead white dwarfs