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A hunter shoots an arrow at a deer running directly away from him. When the arrow leaves the bow, the deer is at a distance of 40 m. When the arrow strikes, the deer is at a distance of 50 m. The speed of the arrow is 65 m/s. a) what should have been the speed of the deer? b) How long did the arrow take to travel to the deer?
A sled slides along a horizontal surface on which the coefficient of kinetic friction is 0.28. Its velocity at point A is 8.0 m/s and at point B is 4.8 m/s. Use the impulse-momentum theorem to find how long the sled takes to travel from A to B.
A refrigerator requires 10 J of work and exhausts 70 J of heat per cycle. What is the refrigerator's coefficient of performance
The plane of a flat, circular loop of wire is horizontal. An external magnetic field is directed perpendicular to the plane of the loop. The magnitude of the external magnetic field is increasing with time.
You ionize a hydrogen atom with a photon with wavelength 77.5nm. What orbital was the electron in before ejection
A constant retarding torque of 12 m.N stops a rolling wheel of adiameter .80 m in a distance of 15 m. How much work is done by torque
A point source of light is submerged 2.2 meters below the surfaceof a lake and emits rays in all directions. What is the maximum radius that this circle could have
Consider an RC circuit in which the capacitor is beingcharged by a battery connected in the circuit. After a time equalto three time constants, what percentage of the final charge is present on the capacitor?
imagine punch lives on the earth at rest. judy traveling past the earth with a speed of 0.600 c. if a rocket moving
A horizontal wire of length 0.57 m, carrying a current of 8.0 A, is placed in a uniform external magnetic field. When the wire is horizontal, estimate the magnitude of the external magnetic field
The G string on a violin has a fundamental frequency of 196 Hz. It is 27.0 cm long and has a mass of 0.500 g. what is the effective length of her string
A 2.5 kg object is attached to a horizontal spring of force constant k = 4.1 kN/m. The spring is stretched 10 cm from equilibrium and released. Find the maximum acceleration
In open heart surgery a much smaller amount of energy will defibrillate the heart. What voltage is applied to the 9.00 µF capacitor of a heart defibrillator that stores 45.0 J of energy
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