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The current in a series circuit is 22.0 A. When an additional 12.0-? resistor is inserted in series, the current drops to 11.0 A. What is the resistance in the original circuit?
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.0 s, it rotates 45 rad. What is the instantaneous angular velocity of the disk at the end of the 5.0 s
A father and a daughter balance a teeter-totter to illustrate the principle of the lever. If the father whose weight is 150 N is 8 m from one end, how far away on the opposite side of the fulcrum should the 50-N daughter stand to balance the teeter-t..
Particle A carries a charge of 5.0 uC, Particle B is 12.0cm, Find the magnitude and direction of the electric force on A due to B
find out the initial velocity of the ball. How fast will the electron be moving when it is very far away.
When lifting an object using the biceps muscle, the forearm acts as a lever with the fulcrum at the elbow. The input work is provided by the biceps muscle pulling up on the bone. How much force should the biceps exert to lift an object weighing 12..
After falling from rest from a height of 35 m, a 0.45 kg ball rebounds upward, reaching a height of 25 m. If the contact between ball and ground lasted 1.8 ms, illustrate what average force was exerted on the ball?
A hydrogen atom is in its first excited state (n = 2). Using the Bohr theory of the atom, calculate (a) the radius of the orbit, (b) the linear momentum of the electron.
An oil drop carries one excess electron and weighs 9.3 x10-15 N. What electric field strength is needed to suspend the drop so it is motionless.
An object of mass "m" is thrown up an inclined plane of angle "theta" with an initial velocity "v knot". If the motion is resisted by retarding force Fr=-kv (where k is a force coefficient and v the velocity of the object.)
A ranger in a national park is driving at 52 km/h when a deer jumps onto the road 86 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -2.9 m/s2.
A river has a steady speed of 0.42m/s. A student swims upstream a distance of 1 km and swims back to the starting point. If the student can swim at a speed of 1.25 m/s in still water, how long does the trip take.
(a) Determine the distance of the final image relative to the converging lens. (b) What is the height of the final image (including the proper algebraic sign)?
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