What is the light intensity on a wall
A krypton laser produces a cylindrical red laser beam 2.0mm in diameter with 2.0W of power. What is the light intensity on a wall 0.80m away from the laser?
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What is the speed of the block immediately after the bullet stops relative to it?
A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m/s. Assuming that air resistance can be ignored, find A) the initial speed of the
A 16 kg loudspeaker is suspended 2.5 m below the ceiling by two cables that are each 60 degrees from vertical. What is the tension in the cables?
For the motion from the initial release until the piece of wood comes to rest, what is the total amount of work done by friction?
A submarine is 305 m horizontally out from the shore and 117 m beneath the surface of the water. A laser beam is sent from the submarine so that it strikes the surface of the water at a point 219 m m from the shore. If the beam strikes the top of
Two particles of different mass start from rest. The same net force acts on both of them as they move over equal distances. How do their final kinetic energies compare?
A 9.0 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.63 T pointing up. During the course of 0.30 s, the field is changed to one of 0.25 T pointing down. What is the average induced emf in th
A pilot claims to have seen a UFO moving initially at a speed of about 429 m/s in an easterly direction and then, in a time interval of only 1.0 s, turning 44°of east and moving at 429 m/s. Compute the UFO's average acceleration during the tur
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