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A rotating flywheel can be used as a method to store energy. If it has 108105j of kinetic energy when rotating at 400 rad/s and if a frictional torque of 4.0 n m acts on the system, in what interval of time would the flywheel come to rest??
a quasars spectrum shows a shift in spectral lines of 0.158. Use the doppler-shift formula to determine what recession velocity this shift indicates, calculate the recession velocity in kms per second
Coherent light with wavelength 591 passes by two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 from the slits. The first-order bright fringe is a distance of 4.84 from the center of the central bright f..
What isthe total random kinetic energy of all the molecules in one mole of helium at a temperature of360 K? With what speed would a mole of helium have to move so that the kinetic energy ofthe mass as a whole would be equal to the total random kineti..
The binding energy of an electron in a crystal lattice is 1.2 x10^(-4) eV. Use the uncertainty relation to estimate the size of the spread of the electron wave function.
Two mirrors form a vertex with an angle of 128°. If a ray of light strikes mirror 1 with an angle of incidence of 48°, find the angle of reflection of the ray when it leaves mirror 2
A photon emitted as a hydrogen atom undergoes a transition from the n = 5 state to the n = 2 state. The energy of the ground state is 13.6 eV. Find the frequency of the emitted photon
To warn his captain of the approaching army, a scout takes his bow and shoots a burning arrow straight vertically into the sky. What is the velocity of the arrow when it leaves the bow
A car is behind a truck going 25m/s on the highway. The car's driver looks for an opportunity to pass, guessing that his car can accelerate at 1.0m/s2. He gauges that he has to cover the 20-m length of the truck, plus 10m clear room at the rear of..
A 132- (including all the contents) rocket has an engine that produces a constant vertical force (the thrust) of 1930. Find the acceleration of the rocket
A narrow beam containing red (660 nm) and blue (470 nm) wavelengths travels from air through a 2.60 cm thick flat piece of crown glass and back to air again. At what angles do the the two colors emerge from the glass
An object is moving in simple harmonic motion with an amplitude of 16 cm and a frequency of 2.0 Hz. Calculate the maximum magnitude of the velocity
What is the compacitance of a parallel-plate capacitor with area 3.8_dm^2 if the seperation between the plates is 0.54_m
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