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A swimmer at the bottom of a pool 3m deep looks up and sees a circle of light. If the index of refraction of the water in the pool is 1.33, find the radius of the circle.
A sledge loaded with bricks has a total mass of 17.3 kg and is pulled at constant speed by a rope inclined at 19.4° above the horizontal. What is the mechanical energy lost due to friction
The space shuttle is in a 400km - high circular orbit. It needs to reach a 700 km -high circular orbit to catch the Hubble Space Telescope for repairs. how much energy is required to boost it to the new orbit
A wheel 90.0 cm in diameter accelerates uniformly from 235 rpm to 385 rpm in 6s. How far will a point on the edge of the wheel have travelled in this time.
A force vector has a magnitude of 595 newtons and points at an angle 39o of below the positive x axis. What is (a) x scalar component and (b) y scalar component of the vector.
The magnetic field B at the center of a circular coil of wire carrying a current I (as in fig. 20-9) is where N is the number of loops in the coild and r is its radius. estimate the magnetic field strength at the center of coil
A 97.1-kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.67 rad/s. Find the angular velocity of the platform with its load
A bird sitting in a tree is travelling at 40 km/s relative to the faraway Sun. When the bird drops to the ground below, does it still go 40 km/s, or does this speed become zero.
You have a 77.7-cm-long copper rod with a rectangular cross section of dimensions 5.75 cm by 8.13 cm. Find the heat current through the rod
A golfer, putting on a green, requires three strokes to "hole the ball." During the first putt, the ball rolls 4.0 m due east. For the second putt, the ball travels 3.1 m at an angle 20° north of east. The third putt is 0.50 m due north. What disp..
Three blocks (1,2,3) of mass 3.00 kg, 2.00 kg, 1.00 kg sit linearly 10.0 cm apart from each other on a frictionless surface. What percent of the initial energy of the bullet was lost
As a baseball is being caught, its speed goes from 36 to 0 m/s in about 0.009 s. Its mass is 0.145 kg. What is the size of the force acting on it
A lightbulb is 48 cm from a convex lens, and its image appears on a screen located 31 cm on the other side of the lens. By how much is the image enlarged or reduced
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