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(a) An astronomer obtains the spectrum of a white dwarf star, and determines that it peaks in the ultraviolet at λ = 150 nm, similar to the spectra of very luminous main-sequence stars. What is the surface temperature of the white dwarf?
(b) At the same time, the astronomer determines that the intrinsic luminosity of the white dwarf is only LW D = 0.01L? (i.e. 1% of the luminosity of the Sun). As discussed in class, the luminosity and temperature of a star can be used to infer its radius. What is the radius of the white dwarf star? Express your answer in terms of the radius of the Sun, R?, and the radius of the earth, R⊕. (i.e., how many solar [Earth] radii is this? Or, on the other hand, what fraction of the solar [Earth] radius is this?)
Your car produces about 34 kW of power to maintain a constant speed of 31 m/s on the highway. What average force does the engine exert?
Rocket-powered sleds are used to test the human response to acceleration. If a rocket-powered sled is accelerated to a speed of 444 m/s in 1.83 seconds.
An X-ray photon with a wavelength of 0.120 nm scatters off a free electron at rest. What is the kinetic energy of the scattered electron
A certain type of laser emits light that has a frequency of 5.6 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 3.9 x 10-11 s.
The current density inside a long, solid, cylindrical wire of radius a is in the direction of the central axis and its magnitude varies with radial distance r from the axis according to J = br2, where b is a positive constant.
A diver springs upward with an initial speed of 1.7 m/s from a 3.0-mboard. What is the highest point he reaches above the water?
The charge of 20μ C produces an electric field. Twopoints are 10 cm and 5cm from this charge. Find the amount of workdone in taking a proton from one point to another
On his honeymoon, James Joule attempted to explore the relationships among various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximum temperature rise would one expect for a wa..
Two square, oppositely charged conducting plates measure 33 cm on each side. They are placed close together and parallel to each other. What is the electric field between the plates
What is this value? In this state, the interference pattern still appears showing that each individual electron can interfere with itself.
An airplane releases a ball as it flies parallel to the ground at a height of 145 m as shown in the figure. If the ball lands on the ground exactly 145 m from the release point, calculate the speed v of the plane. Neglect any effects due to air resis..
A flywheel with a radius of 0.230 meter starts from rest and accelerates with a constant angular acceleration of 0.780 rad/s2. Find the magnitude of the tangential acceleration, the radial acceleration, and the resultant acceleration of a point on ..
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