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Some birthmarks can be removed by exposure to 585 nm laser light. Pulses are strongly absorbed by hemoglobin in the capillaries in the birthmark, destroying them. A typical laser pulse lasts for 1.5 ms, and contains an energy of 7.0 J.
a. What is the power of the laser pulse?
b. How many photons are in each pulse?
The circular top of a can of soda has a radius of 0.029m. The pull-tab has an area of 4.13 10-4m2. The absolute pressure of the carbon dioxide in the can is 1.4 x10^5Pa. Find out the force that this gas generates.
In February 2004, scientists at Purdue University used a highly sensitive technique to measure the mass of a vaccinia virus (the kind used in smallpox vaccine). What is the mass of the virus in femtograms
A flashlight uses batteries that add up to 4.5 V and has a power output of 0.56 W. How much current is drawn from the batteries
A cylindrical glass of water (H2O) has a radius of 3.96 cm, How many moles of water are contained in the glass
What is the minimum coefficient of friction that will prevent sliding. What should be the highest speed of the car so it can round the curve safely.
Find the direction of the net force exerted on the Sun. Give the direction relative to the line connecting the Sun and the Moon
The density of a sample of air is 1.205 kg/m3, and the bulk modulus is 1.42 105 N/m2, Find the temperature of the air sample
A barge has a mass of 27,500 kg and is 13.2 meters wide and 31.5 m long. Find the mass of the iron one that the barge is carrying
A horizontal force of with a magnitude of F = 220 N is applied to block 1, What is the magnitude of the net force on the middle block
A metal rod with a diameter of 2.30 cm and length of 1.10 m has one end immersed in ice at 32oF and the other end in water at 212oF. what is the thermal conductivity of this metal
Coherent light with wavelength 591nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3m from the slits. The first-order bright fringe is a distance of 4.84mm from the center of the central b..
A damped mass-spring system oscillates at 275-Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 3.20cm and the energy of the oscillating system is then 32 J.
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