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A laser that produces a spot of light that is 1.25 mm in diameter is shone perpendicularly on the center of a thin, perfectly reflecting circular (2 mm in diameter) aluminum plate mounted vertically on a flat piece of cork that floats on the surface of the water in a large beaker. The mass of this "sailboat" is 0.25 g, and it travels 1.7 mm in 75.0 s. Assuming that the laser power is constant in the region where the sailboat is located during its motion, what is the power of the laser? (Neglect air resistance and the viscosity of water.
A pencil, 15.7 cm long, is released from a vertical position with the eraser end resting on a table. What is the angular speed of the pencil
A double convex lens has equal curvature radii of 35 cm. What is the refrative index of the lens
A sample of a material has 40000 radioactive particles in it today. Your grandfather measured 80000 radioactive particles in it 60 years ago. how many radioactive particles will the sample have
If the horn acts like an organ pipe which is open on each end, what is the length of the organ pipe in cm, What is the beat frequency that you hear
A 2.00 kg. frictionless block is attached to an ideal spring with force constant 300 n/m. At t=0 the block has velocity -4.0 m/s, what is the position of the block when its speed is 2.5 m/s
A spaceship enters the solar system moving toward the Sun at a constant speed relative to the Sun. how long did it take for the spaceship to travel that distance
A cylinder with a piston contains ½ mole of an ideal gas initially at pressure 4.0 x105 Pa and temperature 300K. Compute the maximum pressure
A member of an aircraft maintence crew wears protective earplugs that reduce the sound intensity by a factor of 350. What sound intensity level would the crew member experience
An air-track glider attached to a spring oscillates between the 12.0cm mark and the 63.0cm mark on the track. What is the maximum speed of the glider
Water flows through two garden hoses. The large diameter hose is connected to the end of the small diameter hose. How are the pressures in the two hoses related
A 954 kg drag race car accelerates from rest to 113 km/h in 0.919 s. What average force is exerted on the car
An airplane travels at speed of 125 m/s in calm air. The plane wants to undergo a change of displacement delta x= 183 km i. How lond will it take the plane to reach its destination
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