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A circular coil of wire carries a current of 22 A. The radius of the loop is 9.0 cm, and the magnitude of the magnetic field at the center of the loop is 6.0 mT (millitesla). How many turns does the
A farsighted man has a contact lens prescription of +2.8 diopters, enabling him to see items in focus when they are no closer to his eyes than 28 cm. What is his near point when he is not wearing th
After scoring the game winning goal a player celebrates by dragging the 55kg goal around the rink. the player drags the goal form rest to 7m/s over a period of 3 seconds.
What would be the magnitude and direction of a vertical electric field that would just support the weight of (a) a proton near the Earth's surface, and (b) an electron near the Earth's surface?
An elevator cab that weighs 25.2 kN moves upward. What is the tension in the cable if the cab's speed is (a) increasing at a rate of 1.21 m/s2 and (b) decreasing at a rate of 1.21 m/s2?
A spaceship lifts off vertically from a planet where g = 7.0 m/s2. If the ship has an upward acceleration of 1.8 m/s2 as it lifts off, what is the magnitude of the force exerted by the ship on its pil
A 9.0 kg hanging weight is connected by a string over a pulley to a 5.0 kg block sliding on a flat table. If the coefficient of sliding friction is 0.20, find the tension in the string.
A 0.54·kg mass vibrates according to the equation x = 0.43 cos (8.44t + 2.91), where x is in meters, and t is in seconds. (a) Determine the amplitude (b) Determine the frequency. (c) Determine
A force F1 of magnitude 5.40 units acts at the origin in a direction 28.0° above the positive x axis. A second force F2 of magnitude 5.00 units acts at the origin in the direction of the positiv
A wedge of glass increases in thickness with an angle of 2 mrad. Green light (wavelength 530 nm) illuminates the upper surface of the wedge at normal incidence.
The edges of a cube consist of equal resistors of resistance R, which are joined at the corners. Let a battery be connected to two opposite corners of a face of the cube. What is the efective resist
A 150 N sled is pulled up a 28o slope at a constant speed by a firce of 100 N. What is the coefficient of kinetic friction between sled and slope?
Consider light that is refracted by a prism shaped like an equilateral triangle. The incident ray is parallel with the prism's base. What is the total deflection of the ray, given that the index of
A 2.0µF capacitor and a 4.0µF capacitor are connected in series across 1000 V. The charged capacitors are then disconnected from the source and connected to each other with terminals of
Two parallel metal plates have area A = 255 cm2 and are separated by l = 0.50cm. They have a potential difference of 0.25 V. Find the numerical value of the electric field. What are the charge densi
A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250 kg crate. If g = 9.8 m/s2, what is the coefficient of static friction?
A 20 kg traffic light hangs midway on a cable between two poles 40 meters apart. If the sag in the in the cable is 0.40 meters, what is the tension in each side of the cable?
A sled weighs 100 N. It is held in place on a frictionless 200 slope by a rope attached to a stake at the top; the rope is parallel to the slope. Find the tension in the rope.
Attached to the 8 kg mass is another light string, which a person uses to to pull both blocks horizontally. If the two block system accelerates at 0.50 m/s2 what is the tension in the connecting str
What is the total charge of the protons that must be fired at the tumor to deposit the required energy?
A stone is thrown straight up. At the top of its path, the net force acting on it is:
Rita accelerates a 0.40 kg ball from rest to 9.0 m/s during the 0.15 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick?
Derive (in Cartesian coordinates) the quantum mechanical operators for the three components of angular momentum starting from the classical definition of angular momentum, l=r x p. Show that any two
An astronaut applies a force of 500 N to an asteroid., and its accelerates at 7.00 m/s2. What is the asteroid's mass?
At what rate must the magnitude of B change in order to induce a current of 0.259 A in the windings of the coil? Answer in units of T/s.