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A 45% efficient device uses chemical energy to generate 420 J of electric energy.
How much chemical energy is used?
A second device uses twice much chemical energy to generate half as much electric energy. What is its efficiency?
A satellite is placed in orbit 7.2 x 105 mabove the surface of Jupiter. Jupiter has a mass of 1.90 1027 kgand a radius of 7.14 x 107 m. Find the orbital speed of the satellite
The positron is a particle with the same mass as an electron but charge +e. what's the radius of its trajectory in the bubble chamber
An iron disk has a radius of 0.525 m and a mass of 377 kg. The disk is mounted on its axis so that it is free to spin. How much force is required if the force is applied at a distance 15.5 cm from the axis of rotation
a 3.8 kg block is accelerated from rest by a compressed spring of spring constant 650 N/m. What is the original compression distance of the spring
Four charges are located in the x-y plane as follows: q@(0,0); 3q @ (a,0); 2q @ (0,a) and -4q @ (a,a). What is the electric force at the center of this distribution
In an L-R-C series circuit, the rms voltage across the resistor is 28.4 V, across the capacitor it is 91.4 V and across the inductor it is 49.3 V. What is the rms voltage of the source
A current of 200 rnA flows in a silver wire of radius 0.8 mm. Find the electric field within the wire
A projectile is launched from a 300 m high cliff at an angle of 30? with an initial velocity of 150 m/s. (g=9.8m/s2). calculate the Direction of the velocity on impact
An object is located to the left of a convex lens with a focal length of 24 cm. The image formed is a real image, and the image is three times as large as the object. What is the distance between the object and the lens
Two vectors have magnitudes of 10m and 15 m. The angle between themwhen they are drawn with their tails at the same point is65?. What is the component of the longer vector along the line of the shorter?
The gravitational force exerted on a baseball is 2.11 N down. A pitcher throws the ball horizontally with velocity 15.0 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 174 ms. The ball starts from rest.
A man drags a 74.0-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. Find the magnitude of the tension in the strap
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