The iron we commonly find in our surroundings came from
A) the iron core of a massive star which exploded as a type I supernova.
B) planetary nebulae.
C) jets ejected by a rapidly spinning pulsar.
D) material ejected by a nova explosion.
E) decay of nickel 56 and cobalt 56 in a supernova remnant.
E
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Consider the radiation heat transfer from an open fireplace that has a fire in it, as shown in the figure. The effective surface temperature of the fire is 600ºF and the fire has an effective emissivity of 0.95. The surroundings act as a black body at 60ºF. Determine the net heat transfer to a person sitting in front of the fireplace and the equilibrium surface temperature facing the fireplace. Neglect radiation from the back side and assume a shape factor of 0.15 for the opening of the fireplace to the person.
After a skydiver reaches terminal velocity,
a. the force of gravity no longer performs work on the skydiver. b. work performed by the force of gravity is converted into gravitational potential energy. c. gravitational potential energy is no longer available to the system of the skydiver plus the Earth. d. gravitational potential energy is converted into thermal energy. e. thermal energy is converted into gravitational potential energy.
Which one of the following is the correct representation of the electromagnetic waves from longer wavelength to shorter wavelength?
A) radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays B) radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays C) radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays D) radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays E) radio waves, infrared, X-rays, microwaves, UV, visible, gamma rays
What is the speed of the wave described by y(x,t) = A cos(x2 + 2Bxt +B2t2 )
A) B/2 B) B C) 2Bx D) B2 E) The function given is not a solution to the wave equation.