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A small helium-neon laser emits red visible light with a power of 3.2 mW in a beam with a diameter of 2.5 mm.
a) what are the amplitudes of the electric and magnetic fields of the light?
b) what are the average energy densities associated with the electric field and with the magnetic field?
c) what is the total energy contained in a 1.00 m length of the beam?
A 4.86 g bullet moving with an initial speed of vi = 439 m/s is fired into and passes through a 1.06 kg block. The block, initially at rest on a frictionless horizontal surface, is connected to a spring with the spring constant of 832 N/m.
While hauling a log in the back of a flatbed truck, you are pulled over by the state police, The log has a mass of m = 844 kg; the truck has a mass of M = 9750 kg. According to the truck manufacturer, Calculate the minimum coefficient of static frict..
Consider a very high energy cosmic ray photon, with energy 109mp = 1018 eV as measured in Sun's rest frame, scattering off a cosmic microwave background photon with energy 2 x 10-4 eV . Establish the maximum energy of the scattered photon.
What is the centripetal acceleration of an object on the Earth's equator owing to the rotation of the Earth? What would the period of rotation (in hours = h) of the Earth have to be for objects on the equator to have a centripetal acceleration equ..
A wave has a speed of 500.0 m/s and a wavelength of 4.9 m. What is the frequency of the wave? What is the period of the wave?
An infinite plane of surface charge density +.2uC/m^2 is in the y-z plane at x=0, What is the magnitude of the electric field close to the surface
Find the distance point P on the tip of the blade has traveled in 3 sec. Also, find the magnitude of the acceleration of point P when t = 3 sec.
An automobile tire is inflated with air originally at 10.0°C and normal atmospheric pressure. During the process, What is the tire pressure in pascals
one end of a unifrom meter stick of mass 0.25kg is placed against a vertical wall. The other end is held by a lightweight cord making an angle ? =20 degree with the stick, find the frictional force between the stick and the wall
A block of wood with volume V floats in water with 0.65V submerged. In oil the block floats with 0.84V of its volume submerged
The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3 x 10-11 m, what is a fundamental difference between the two forces
If an object of 50 grams of unknown material at 100 degrees C is mixed with 100 grams of water at 0 degrees C, the final temperature is 40 degrees C
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