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A dentist wants a small mirror that, when 2.20 cm from a tooth, will produce a 4.5 x upright image. What kind of mirror must be used and what must its radius of curvature be?
A car carrying a 77-kg test dummy crashed into a wall at 27m/s and is brought to rest in 0.1 s. demonstrate that the average force exerted by the seat belt on the dummy is 18,760N.
Two physical pendulums ( not simple pendulum) are made from sticks that are suspended from the ceiling at one end. The sticks are uniform and are identical in all respects, except one is made of wood (mass = 0.17 kg )and the other of metal (mass =..
what is the rate of heat transfer from the plate to the air? If the free stream velocity if the air is doubled and the pressure are increased to 10 atm, what is the rate of heat transfer.
A small metal bead, labelled A, has a charge of 29 nC. It is touched to metal bead B, initially neutral, so that the two beads share the 29 nC charge, but not of necessity evenly. When the two beads are then placed 5.0 {rm cm} apart, the force betwee..
A 9.8 kg object oscillates at the end of a vertical spring that has a spring constant of 1.9 * 10^4 N/m. The effect of air resistance is represented by the damping coefficient b= 3.00 Ns/m.
An unmarked police car travelling a constant 80 km/h is passed by the speeder travelling 100 km/h. precisely l.0s after the speeder passes, the policeman steps on an accelerator; if the police car's acceleration is 2.0m/s2, how much time passes befor..
A rotating cylinder about 16 {rm km} long and 7.40 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it would experience the same acceleration due to gravity as on Earth.
Much of the material making up Saturn's rings is in the form of tiny dust grains having radii on the order of 10-6 m. These grains are located in a region containing a dilute ionized gas, and they pick up excess electrons. As an approximation, sup..
A 3.0 block of wood sits on a table. A 3 bullet, fired horizontally at a speed of 440, goes completely by the block, emerging at a speed of 180.What is the speed of the block immediately after the bullet exits.
What is the speed of the arrow as it leaves the bow.Two point charges, Q_1 = -6.9 mu C and Q_2 = 2.0 mu C are located between 2 oppositely charged parallel plates.
what the torque increase or decrease as the angle increase. Calculate the magnitude of the torque.
A lens placed at the origin with its axis pointing all along the x axis produces a real inverted image at x=-24cm that is twice as tall as the object. What is an image distance.
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