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A straight rod consists of a 1.2-cm-long piece of aluminum attached to a 2.0-cm-long piece of steel. By how much will the length of this rod change if its temperature is increased from 20 ?C to 40 ?C? note: answer in cm please.
Two tiny conducting spheres are identical and carry charges of -18.5C and +51.6C. They are separated by a distance of 1.92 cm. (a) What is the magnitude of the force that each sphere experiences?
How much current does an immersion heater draw from the car
A 1300- {rm N} crate slides 15- {rm m} down a ramp that makes an angle of 35^circ with the horizontal. If the crate slides at the constant speed, how much thermal energy is created.
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 .
A slide projector needs to create a 86 cm high image of a 2.0 cm tall slide, What focal length does the lens need and How far should you place the lens from the slide
A horizontal pipe contains water at a pressure of 111 kPa flowing with a speed of 1.8.00 m/s. The pipe narrows to one-half its original diameter. What are speed and pressure of the water while the pipe narrows?
A car drives straight off the edge of a cliff that is 47.00m high. The police at the scene of the accident observed that the point of impact is 122 m from the base of the cliff. How fast was the car travelling when it went over the cliff.
assume the film show in the figure has an index of refraction of 1.36 and is surrounded by air on both sides.
A person pushes the shopping cart with a force of 100 N acting down at 45 degrees. Of the cart travelled at a constant speed of 1.00 meters per second what is the value of combined retarding force acting horizontally on the cart due to friction an..
A 51.0 g sample of a conducting material is all that is available. The resistivity of the material is measured to be 12 ? 10-8, What must be the diameter of the wire
A parallel-plate air capacitor of area A = 20.9 cm2 and plate separation of d = 2.50 mm is charged by a battery to a voltage of 63.0 V, What is the charge on the capacitor
If she is served 200 of coffee at 84 in a well-insulated container, how much ice at 0 should she add to obtain a final temperature of 31.
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