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A laser used to weld detached retinas puts out 31 milliseconds long pulses of 640 nanometers light which average 0.71 Watt output during a pulse.
a) Obtain how much energy can be deposited per pulse?
b) Obtain how many photons does each pulse contain?
a 4.6kg sphere made of metal whose density is 3800kg/m^3, is suspended by a cord. What fraction of the volume of the sphere is submerged
A monatomic ideal gas expands at constant pressure. (a) What percentage of the heat being supplied to the gas is used to increase the internal energy of the gas? (b) What percentage is used for doing the work of expansion?
A 1400kg weather rocket accelerates upward at 10m/s^ 2 . It explodes 2.5s after liftoff and breaks into two fragments, What was the direction of the heavier fragment
During 30 seconds of use, 250 C of charge flow s through a microwave oven. Compute the size of the electric current
The engine in a 1500kg car has a maximum power output of 200hp , but 25% of the power is lost before reaching the drive wheels. What is the car's top speed
A circular armature coil is used in a motor with a uniform magnetic field of 1.80 T. The coil has a diameter 95 cm, how much current is flowing throught the motor
Two particles are moving along the x axis. Particle 1 has a mass m1 and a velocity v1 = +3.7 m/s. Find the ratio m1/m2 of the masses of the particles
What happens to rechargable batteries in the process of recharging? What are some experiments you can do to test how batteries work?
The eccentricity,e, of the Moon's orbit is 0.0549 and the mean orbital radius rL=(ab)^1/2 is 384,100 km. Calculate the lengths of the principal axes a and b of the Moon's orbit. How far is the center of Earth from the center of the elliptical orbit? ..
A rocket, which is in deep space and initially at rest relative to an inertial reference frame, has a mass of 72.4 x 10^5 kg, of which 11.5 x 10^5 kg is fuel. What is the rocket's thrust
a if a mass of 2kg is attached to a string of length 1m and pulled back to the angle shown 30 degrees from straight
A car is traveling along a straight road at a velocity of +34.0 m/s when its engine cuts out. Find the velocity of the car at the end of the initial ten-second interval
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