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What will be the percentage change in power output if the voltage drops to 105 ? Assume no change in resistance. How would the actual change in resistivity with temperature affect your answer?
A charge of 40pC is distributed on an isolated spherical conductor that has a 4cm radius. Point a is 1cm from the center of the conductor and point b is 5cm from the center of the conductor. Determ
The punter on a football team tries to kick a ball so that it stays in the air for a long "hang time". If the ball is kicked with an initial velocity of 25.0 m/s at an angle of 60.0 degree above the
What is the coefficient of static friction between the book and the tabletop? What is the coefficient of kinetic friction between the book and the tabletop?
Positive charge is distributed uniformly throughout a large insulating cylinder of radius R = 0.500 m. The charge per unit length in the cylindrical volume is lambda = 9.00×10-9 C/m. Calculate
What is the speed of the student apporaching the wall? Use 340 m/s as the speed of sound in air.
A 1200-kg car accelerates from rest to 20m/s in 7.8 s, moving in a straight line with constant acceleration. (a) What is the net force acting on the car? (b) If the car then rounds a bend 85 m in ra
Calculate the gravitational force between the Sun and Jupiter. The mass of the Sun is 1.99×1030 kg. The mass of Jupiter is 19000×1023 kg. The distance between them is 77.8×1010 m.
A person with a blackbelt in karate has a fist that has a mass of 0.58 kg. Starting from rest, this fist attains a velocity of 7.8 m/s in 0.22 s. What is the magnitude of the average net force appli
In a game of basketball, a forward makes a bounce pass to the center. The ball is thrown with an initial speed of 4.4 at an angle of 15 below the horizontal. It is released 0.90 above the floor. Wha
The lift force has a magnitude of 1800 N. If the lift force should suddenly decrease to 1200 N, what would be the vertical acceleration of the glider? Take the upward direction to be the +y directio
If a horizontal force of magnitude P= 5.0 N is applied to the block as shown and the resulting acceleration of the block is measured to be 0.75m/s^2, what is the rotational inertia of the wheel?
A massless spring having a spring constant k= 8.75 n/m is hung vertically. If the spring is displaced 0.150m from it's equilibrium position, what is the force that the spring exerts?
At what rate is the spring doing work on the ladle when the spring is compressed 0.11 m and the ladle is moving away from the equilibrium position?
Find (a) the work done by the cord's force on the block, (b) the work done by the gravitational force on the block, (c) the kinetic energy of the block, and (d) the speed of the block. (Note : Take
A crate of mass M is released from rest at the top of a frictionless track (height = .4m). It slides down the track onto a horizontal section, then encounters a rough patch with coefficient of kine
If the toddler's mass is 12.6kg, and the toddler's ankle is 4.23cm from the point at which her feet makes contact wit the floor. What is the counter clockwise torque produced by the normal force of
You pull a 12-kg box across the floor with a strap that is at an angle of 45° above the horizontal. Find the normal force and the tension in the strap, given that the box moves with constant spe
How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude 1.00 * 10-4(roughly one ton)? Assume that the spheres
A nonconducting disk of radius R lies in the z = 0 plane with its center at the origin. The disk has a uniform surface charge density s. Find the value of z for which Ez = s/(4e0).
A railroad car of mass m is moving at speed v when it collides with a second railroad car of mass M which is at rest. The two cars lock together instantaneously and move along the track. What is the
A fully dressed person is at rest in the middle of a pond on perfectly frictionless ice and must get to the shore.how can this be accomplished? explain in terms of momentum conservation.
Discuss the humidity in an air conditioned room and in a heated room in the winter. Why should we use a humidifier and dehumidifier? If the outside temperature is 41o F and room temperature is 68o F
A solenoid used to produce magnetic fields for research purposes is 1.7 m long, with an inner radius of 28 cm and 1400 turns of wire. When running, the solenoid produced a field of 1.5 T in the cent
When you place the sample to be examined at a distance of 1.30 cm from the objective, at what length will you need to adjust the tube of the microscope in order to view the sample in focus with a co