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A tapering telephone pole is 10 m long and has a mass of 300 kg. Its center of gravity is 3m from the thick end. What force must be exerted to hold the thin end off the ground so that the axis of th
A 11.04lb cat , initially standing one sled , jumps across to the other sled and immediately jumps back to the first sled . For both jumps the cat's speed is 6.2 ft/s relative to the ice. Find the m
Two parallel wires with centers separated by 8.0 mm each carry 15 A in the opposite direction. Find the magnitude of the force per unit length on each wire.
The driver of a 1300-kg car moving at 17 m/s brakes quickly to 11 m/s when he spots a local garage sale. (a.) Find the change in the car's kinetic energy.
Two long parallel wires each carry 2.4 A in the same direction, with their centers 2.0 cm apart. A) Find the magnitude of the magnetic field halfway between the wires.
a) Calculate the impulse delivered to the ball during impact b) If the ball is in contact with the slab for 1.216 x 10^-3 s, find the average force on the ball during impact.
A 35-kg crte rests on ahorizontal floor, and a 65-kg person is standing on the crate. Determine the magnitude of the normal force that the floor exerts on the crate.
A resting ball of mass 552g is struck horizontally by a mallet imparting an impulsive force give by F(t)= -552 for t1<t<t2 and F=0 otherwise. Here F is in Newtons and t is in milliseconds with
An electric motor has a 920-turn coil on its armature. The coil is circular with diameter 19 cm and carries 11.5 A. Find the maximum torque on the coil when it rotates in a 1.90 T magnetic field.
Find the torque on the loop in a 2.0 T magnetic field directed in the plane of the loop.
A boat has a mass of 6800 kg. its engines generate a drive force of 4100 N, due west, while the wind exerts a force of 800 N, due east, and the water exerts a resistive force of 1200 N due east. Wha
What angle should the wire make with the magnetic field so that the wire experiences a force per unit length of 1.90 N/m? Assume that the angle is sharp.
A pellet -gun fires 15.2 pellets per second , each of mass 55.2 g, at a speed of 310m/s . A rigid wall stops the pellets. a) What is the momentum of each pellet ?
An observer in air, viewing the medallion from directly above, sees the medallion at an apparent depth of 1.5 cm beneath the top surface of the block. How far below the top surface would the medalli
A straight conducting wire carries a 7.7 A current in the +y-direction. Find the magnitude of the magnetic field that results in a force per unit length on the wire of 0.16 N/m in the -z-direction.
A copper wire has diameter 0.160 mm and length 18.0 cm. It's in a horizontal plane and carries a current of 2.10 A. The density of copper is 8920 kg/m^3. Find the magnitude of the magnetic field nee
A 7.60 cm length of straight wire runs horizontally along a north-south line. The wire carries a 3.75 A current flowing northward through a uniform 1.25 T magnetic field directed vertically upward.
What is the angular acceleration in the second training exercise?
Two 11 cm-diameter charged disks face each other, 24 cm apart. Both disks are charged to - 30 nC. What is the electric field strength a point on the axis 5.0 cm from one disk between them?
Determine the numbered section on which the wheel comes to a halt when the deceleration of the wheel has a magnitude of 0.161 rev/s2 and the initial angular velocity is (a) +0.693 rev/s and (b) +3.18
Two 10-cm-diameter charged rings face each other, 16.0 cm apart. Both rings are charged to + 50.0 nC . What is the electric field strength at the center of the ring?
Consider a railroad flat car of weight W=2760 N that can roll without friction along a straight horizontal track. Initially a man of weight w=496 N is simply standing on the car, which is moving to
A 10 cm long thin glass rod is uniformly charged to +50nC . A small plastic bead, charged to - 5.5nC , is 4.5cm from the center of the rod. What is the magnitude of the force on the bead?
A 3000 Kg object is lowered by a cable with an acceleration of 1.000m/s2. What is the tension in the cable?
A projectile of mass 9.12g is fired horizontally with a speed of 496m/s into a ballistic- pendulum bob of mass 3.1kg that is initially at rest and has a suspension length of 0.62m. Compute a) the ve