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at its perihelion in February 1986, comet Halley was 8.79*10^7 km from the sun and was moving at 54.6 km/s. What was its speed when it crossed Neptune's orbit in 2006?
A jogger accelerates from rest to 5.87 m/s in 3.53 s. A car accelerates from 21.3 to 34.7 m/s also in 3.53 s. (a) Find the magnitude of the acceleration of the jogger. (b) Find out the magnitude of the acceleration of the car. (c) How much further..
A point charge Q = 8.50×10-6 C is at the center of a conducting spherical shell of radius R = 17.90 cm. What is the field just outside the shell
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 14-g nail when it is struck by a 550-g hammer moving with an initial speed of 3.3 m/s.
(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 rotating wheel has a constant angular acceleration. It has an angular velocity of 5.0 rad/s at time t = 0 s, What is the angular displacement of the wheel
Billy throws a ball straight up and it rises 22 meters into the sky. With what initial velocity must he have thrown the ball
A ceiling fan is turned on and a net torque of 1.6 N·m applied to the blades. What is the angular acceleration of the blades
A charge of -2.82 μC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.118 m). The charges on the circle are -4.04 μC at the position due north and +5.11 μC at the position due east.
An electrical motor spins at a constant 2675 rpm. If the armature radius is 3.49 cm, what is the acceleration of the edge of the rotor
A small coil of 40 turns and a surface area 30 cm^2 has its plane perpendicular to a magnetic field B=0.5T. how much charge passes through the coil
A 63kg sprinter, starting from rest, runs 45m in 7.0 s at constant acceleration. find the magnitude of the horizontal force acting on the sprinter
A cylindrical tank with a large diameter is filled with water to a depth D = 0.25 m. A hole of cross section A = 6.1 cm2 in the bottom of the tank allows water to drain out. What is the rate at which water flows out
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