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Although they don’t have mass, photons—traveling at the speed of light—have momentum. Space travel experts have thought of capitalizing on this fact by constructing solar sails—large sheets of material that would work by reflecting photons. Since the momentum of the photon would be reversed, an impulse would be exerted on it by the solar sail, and—by Newton’s Third Law—an impulse would also be exerted on the sail, providing a force. In space near the Earth, about 3.84·10^21 photons are incident per square meter per second. On average, the momentum of each photon is 1.30·10^–27 kg m/s. Assume that we have a 1287 kg spaceship starting from rest attached to a square sail 29.9 m wide.
a) How fast could the ship be moving after 35 days?b) How many months would it take the ship to attain a speed of 7.93 km/s, roughly the speed of the space shuttle in orbit?
When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of 20 km (about the size of San Francisco). If a neutron star rotates once every second, (a) what is the speed of a particle..
The threshold of dark-adapted (scotopic) vision is 8.0 ? 10-11 W/m2 at a central wavelength of 450 nm. how many photons per second enter the eye
a compressor operates at steady state with air entering at 1 bar 20 deg celsius and exiting at 5 bar. a if the air
the solar constant is the radiant flux density from the sun at the earth's surface and is about 0.135 W/cm^2 when the sun is directly overhead, find the amplitude of the E and B fields
three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. the cubes are
A stone of mass 0.31 kg is tied to a string of length 0.85 m and is swung in the horizontal circle with speed v. The string has a breaking-point force of 90 N. What is the largest value v can have without string breaking.
the standard enthalpy of formation of the metallocene bisbenzenechromium was measured in a calorimeter. it was found
You stand on a frictionless platform that is rotating with an angular speed of 7.2 rev/s. What is the change in kinetic energy of the system
A 3-kg object initially traveling at 6 m/s in the negative x direction collides and sticks to a 4-kg object traveling at 2 m/s in the positive y direction. find the magnitude of the velocity of the combined objects
A power factor is 0.72 lagging and the power dissipated is 375W. 120V and a resistance of 10 ohms, showing all working out.
A person weighing 500 N climbs a ladder leaning against awall. The ladder weighs 100 N and is 2.00 M long, How high does the person get before this begins to happen
Determine the magnitude and direction of impulse delivered to the ball by the floor.
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