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1- A 1.8 mW helium-neon laser beam delivers a spot of light 8 mm in diameter across a room 17 m wide. The beam radiates from a small circular area of diameter 0.5 mm at the output mirror of the laser. Assume irradiance is constant across the diverging beam. What is the radiance (in SI units) of the laser? Give your answer to 3 significant figures.
2- A small monochromatic light source, radiating at 455 nm, is rated at 992 W. If the source radiates uniformly in all directions, determine its radiant intensity in SI units. Give your answer to 1 decimal place.
A 400kg soccer ball approaches a player horizontally with aspeed of 15.0 m/s. What impulse was delivered to the ball by the player
You are to drive to an interview in another town, at a distance of 298 km on an expressway. What would be the least speed needed for the rest of the trip to arrive in time for the interview
What is the velocity of a beam of electrons that go undeflected when passing through perpendicular electric, What is the radius of the electron orbit if the electric field is turned off
An insulated Thermos contains 119 cm3 of hot coffee at 64 °C. You put a 12g ice cube at its melting point to cool the coffee. By how a lot of degrees have your coffee cooled once the ice has melted and equilibrium is reached.
A vertical tube 1.9 cm in diameter and open at the top contains 7.6 g of oil (density 0.82 g/cm^3 floating on 7.6g of water. Find the gauge pressure at the oil-water interface
In a physics lab experiment, a spring clamped to the table shoots a22 {\rm g} ball horizontally. When the spring is compressed 22 {\rm cm}, the ball travelshorizontally 5.2 {\rm m} and lands on the floor1.3 {\rm m} below the point at which it left..
a man swimming at 3 m/s crosses a river flowing East at 1 m/s. The river is 300 m wide. At what angle to the bank should he swim
Consider an LC Circuit in which L = 500 mH & C = 0.100 microF. What is the resonance frequency
A small ball is doing circular motion around a pole. The string connecting the pole and the ball is 30 degrees (?) away from the pole. Find the linear speed of the ball
A golf ball with the initial angle of 34° lands exactly 240 m down the range on the level course.
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.08 m × 1.86 m. On a certain day, the indoor temperature is 27°C and the outdoor temperature is 0°C. (Assume the thermal conductivity of the glass is 0.8 J/s · m · °C.)
The drive propeller of a ship starts from rest and accelerates at 2.69 x 10-3 rad/s2 for 2.80 x 103 s. Find the total angular displacement of the propeller
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