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The driver of a 3000 lb car, coasting down a hill, must stop at the bottom. His speed when he applies the brakes is 60 mph & he is 100 feet (vertically) from the bottom of the hill.
How much energy (as heat) must be dissipated by the brakes?
Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. The magnitude of each of the charges is 4.0 µC, and the lengths of the sides of the triangle are 4.4..
Both surfaces of a double convex lens have radii of 30.0 cm. what is the index of refraction of the lens material
A rifle fires a 2.39 10-2-kg pellet straight upward, since the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 9.17 10-2 m from its unstrained length. The pellet r..
A parallel plate capacitor of capacitance 7.2 µF has the space between the plates filled with a slab of glass with ? = 3.5. Find the capacitance after the glass is removed
A 3.04 μF capacitor and a 7.84 μF capacitor are connected in series across a 17.0 V battery. What voltage would be required to charge a parallel combination of the same two capacitors to the same total energy?
A 7.0cm--diameter disk emits light uniformly from its surface. 20cm from this disk, along its axis, is an 9.0cm--diameter opaque black disk; the faces of the two disks are parallel. find the diameter of the completely dark part of this shadow
q1. clarify how einsteins contribution to understanding the force between the earth and the moon differed from newtons.
A train at rest emits a sound at a frequency of 1045 Hz. An observer in a car travels away from the sound source at a speed of 37 m/s. What is the frequency heard by the observer? Imagine the speed of sound in air to be 340 m/s.
vector identiteis can be proven by grinding them out in component form but it is more satisfying to use methods based
A 28 kg child plays on a swing having support ropes that are 1.80 m long. A friend pulls her back until the ropes are 43 from the vertical and releases her from rest.
Electrons are accelerated from rest through a potential difference of 350V and then enter a uniform magnetic field that is perpendicular to the velocity of the electrons. what is the angular speed of this electron
A 1000kg ar accelerates from rest to 25.0m/s in 4.20 s.Ignoring frictional forces. what is the average power( inhorsepower) delivered by the engine
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