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a rock is thrown downward from the top of a building 168 ft high at an angle of 60 with the horizontal. how far from the base will the rock land if the initial velocity is 80ft/s?
A long horizontal wire carries a current of 48 {rm A}. A second wire, made of 2.6 mm diameter copper wire and parallel to the first, is kept in suspension magnetically 15 {rm cm} below. Examine the magnitude of the current in the lower wire.
A 1.35 kg object is moving in the x direction at 16.4 m/s. Just 3.61 s later, it is moving at 28.8 m/s at 36.0^circ to the x axis. What is the magnitude of force applied throughout this time.
(a) What must the initial speed of the ball be if the pitch is to arrive at the batter exactly 1.00 m above the ground? (b) How long does it take the ball to reach the batter? (c) If there were no gravity, at what angle would the pitch have to be ..
A 280-g block on a 52 cm long string swings in a circle on a horizontal, frictionless table at 95 rpm. What is the speed of the block.
A ball is thrown toward a cliff of height h with a speed of 30m/s and an angle of 60? above horizontal, What was the maximum height of the ball
An object that hangs form the ceiling of a staionary elevator by an ideal spring scilliates with a period T. If the elevator accelerates upward 2g , what will the period of oscillation of the object ?
A thin copper rod 1 m long has a mass of 50 g. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T.
Three equal point charges, each with charge 1.45?C, are placed at the vertices of an equilateral triangle whose sides are of length 0.650m
A car carrying a 77-kg test dummy crashed into a wall at 27m/s and is brought to rest in 0.1 s. demonstrate that the average force exerted by the seat belt on the dummy is 18,760N.
A highly charged piece of metal (with uniform potential throughout) tends to spark at places where the radius of curvature is small, For that amount of charge, what is the potential of the sphere relative to infinity
A picture shows a charge A 1.00 m above the origin and has a charge of 5.00 X10^-9, Find the magnitude and direction of the electrostatic force on charge B.
A car traveling at 24.0 {rm m/s} runs out of gas while traveling up a 25.0^circ slope. How far would the car go up the hill before it runs out of gas.
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