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A laserpointer has a beam intensity of 37 W/m2 and a beam radius of 3.1 mm. A first grader attempts to use it to move a black toy car. Assuming perfect absorption, what is the force on the car?
A typical red blood cell subtends an angle of only 1.91E-5 rad while viewed at a person's near-point distance of 25cm. Assume a red blood cell is examined with a compound microscope in which the objective and eyepiece are separated by a distance o..
Two cars travel in the same direction along a straight highway, How far must the faster car travel before it has a 15-min lead on the slower car
Two cars are travelling on a dirt road between 3 consecutive poles after 5.40s they are side by side at next telephone pole. The distance between the poles is 66.30m.
A 770 kg car moving at 21 m/s brakes to a stop. The brakes contain about 15 kg of iron, which absorbs the energy. What is the increase in temperature of the brakes.
Here on Earth you hang a mass from a vertical spring and start it oscillating with amplitude 1.9 cm. How long does it take for the mass to make one round trip
A skier finds that she must give hersel a push to get started down ski slopes with angles less than 8 degrees. What is the coefficient of static friction between the skis and the snow
During the time a compact disc(CD) accelerates from rest to a constant rotational speed of 1260rev/min, what is the angular acceleration of the CD
A spacecraft is traveling with a velocity of vox = 5675 m/salong the +x direction. Two engines are turned on for a time of 847 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.25 m/s2,while the other gives it an acc..
How much time after engine failure will elapse before the rocket comes crashing down to the launch pad?
An earth satellite is observed to have a height of pergee of 210 Kilometers and a height of apogee of 1,200 kilometers. Find the period of the orbit
A layer of oil (n = 1.45) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid. What is the index of refraction of the unknown liquid
Steam is expanded from 12.5 MPa and 900 degrees Celsius to 0.30 MPa, 400 degrees Celsius in an adiabatic turbine. Determine the power output by this turbine
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