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A laser used to weld detached retinas emits light with a wavelength of 652{\rm nm} in pulses that are 20.0{\rm ms} in duration. The average power expended during each pulse is 0.600{\rm W} .
A) How much energy is in each pulse, in joules?
B) How much energy is in each pulse, in electron volts?
C) What is the energy of one photon in joules?
D) How many photons are in each pulse?
E) What is the energy of one photon in electron volts?
A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. find the temperature of the outer surface of the clothes
The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981, Determine the initial speed of the projectile
four resistors and a capacitor are connected to an 18 v battery with negligible internal resistance, calculate the net resistance of the circuit
Young Jeffrey is bored, and decides to throw some things out of the window for fun. But since he is also very curious, he decides to do so in a controlled way.
Estimate the acceleration of cyclist, and roller coaster.
A cooling fan is turned off when it is running at 880rev/min . It turns 1000 revolutions before it comes to a stop. What was the fan's angular acceleration, assumed constant
In a television set, the power needed to operate the picture tube comes from the secondary of a transformer. Determine the secondary voltage
A -19 mC charge experiences a force of 60 N directed south. What is the electric field magnitude and direction at the location of the charge
An elevator is initially moving upward at a speed of 11.18 m/s. The elevator experiences the constant downward acceleration of magnitude 4.44 m/s2 for 2.87 s.
At t = 0, a stone is dropped from a cliff above a lake; 2.2 seconds later another stone is thrown downward from the same point with an initial speed of 48.0 m/s. Find the height of the cliff
A rock of mass 34 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 248 N. Elucidate what is the magnitude of the acceleration of the rock?
What is walking speed if the speed drops. after an exciting but exhausting lecture, a physic lecture stretch out for a nap on a bed of nails, suffering no injury and only moderate discomfort. how is this possible.
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