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Question: What is the intensity in W/m² of a laser beam used to burn away cancerous tissue that, when 91.5% absorbed, puts 453 J of energy into a circular spot 2.13 mm in diameter in 3.80 s?
How many times more intense is this than the maximum intensity of direct sunlight (about 1360 W/m²)?
The figure below shows a thin, uniform bar of length D =1.11 m and mass M =0.82 kg pivoted at the top. The rod, which is originally at rest, is struck by a particle whose mass is m = 0.30 kg at a point x = 0.80d below the pivot.
Compare the charge distribution on a flat surface compared to a curved surface and explain why these distributions occur
q1. a circular loop of radius 11 cm lies in the plane of the paper. a constant magnetic field of 250 mt is directed
The distance between two consecutive nodes of a standing wave is 20.4 cm. The hand generating the pulses moves up and down through a complete cycle 3.61 times every 5.03 s. Find the velocity of the wave. Answer in units of m/s.
A 12.0 kilogram shell is launched at an angle of 55o above the horizon with an initial velocity of 150 m/s. obtain how much energy was released by the explosion
Suppose a straight 1.65mm diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B? What current would the wire carry?
A spherical hydrogen-filled balloon is used to lift a load of 5705 N (in addition to the weight of the hydrogen). Find the minumum necessary radius for the balloon
A copper pipe with an outer radius of 0.016 m runs from an outdoor wall faucet into the interior of a house. The temperature of the faucet is 2.1°C, Find the inner radius of the pipe
An old Chrysler with mass 2200 kg is moving along a straight stretch of road at 86 km/h. How fast (in km/h) is the center of mass of the two cars moving
In this lab, you will be rotating a mass on one side of a string that is balanced by a second mass on the other end of the string (Figure 6).
A beam of light is traveling inside a solid glass cube having index of refraction 1.64. It strikes the surface of the cube from the inside. If the cube is in air, at what minimum angle with the normal inside the glass will this light not enter the..
Three liters (3000 cm3) of oil is spilled onto a smooth lake. If the oil spreads out uniformly until it makes a circular oil slick just one molecule thick, estimate the diameter of the oil slick
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