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A contact lens is made of plastic with an index of refraction of 1.58. The lens has an outer radius of curvature of +2.03 cm and an inner radius of curvature of +2.42 cm. What is the focal length of the lens?
a water-skier is being pulled by a tow rope attached to a boat. as the driver pushes the throttle forward the skier
A 5kg steel ball strikes a wall with a speed of 8m/s at an angle of 60.0° with the surface. It bounces off with the similar speed and angle. If the ball is in contact with the wall for 0.200 s, what is the average force exerted by the wall on the ..
A +6.00 µC charge is moving with a speed of 8.50 104 m/s parallel to a very long, straight wire. The wire is 5.00 cm from the charge and carries a current of 78.0 A in a direction opposite to that of the moving charge. Find the magnitude and directio..
A frictionless pulley has the shape of a uniform solid disk of mass 6.00 and radius 28.0 . A 2.70stone is attached to a very light wire that is wrapped around the rim of the pulley(Figure 1) , and the stone is released from rest. As it falls down,..
anbspnbsp a continuous stirred tank reactor is used to treat an industrial waste product using a reaction that destroys
You push a crate across a rough floor against a constat force of friction. You first push with a force of 35N, the acceleration of the box is 0.80m/s^2; Find the mass of the box
A 40 g marble moving at 2.0 m/s strikes a 22 g marble at rest. What is the speed of each marble immediately after the collision
The Space Shuttle travels at a speed of about 7.6 × 103 m/s. The blink of an astronaut's eye lasts about 110 ms. How many football fields (length = 91.4 m) does the Shuttle cover in the blink of an eye
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27.0° above the horizontal. What is the magnitude of the net torque exerted on the branch by the children
A certain atom of has 77 protons. Assume that the nucleus is a sphere with radius 6.73 fm and with the charge of the protons uniformly spread through the sphere. At the nucleus surface what is the magnitude of the electric field produced by the proto..
A solid disk of radius R and mass 2.66 kg is spinning at angular velocity 66.2 rpm about a vertical axis. What is the mass of the second disk
A particle of mass 0.500 kg is attached to the 100-cm mark of a meter stick of mass 0.150 kg. Calculate the angular momentum of the system when the stick is pivoted about an axis perpendicular to the table through the 50.0-cm mark
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