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A spring (k = 866 N/m) is hanging from the ceiling of an elevator, and a 7.3-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.77 m/s2?
Two electrons are located at two of the vertices of an equilateral triangle, one at each vertex. The length of one side of the triangle is 1.00 nm. What is the net electric field at the third vertex
The sound level measured in the room by a person watching a movie in a home theatre system varies from 63 dB throughout a quiet part to 92 dB throughout a loud part. In the order of how many times louder is the latter sound.
A convex spherical mirror has a radius of curvature of 10.6cm. Calculate the size of the image
A spacecraft is in orbit around a planet. The radius of the orbit is 3.2 times the radius of the planet (which is R = 71466 km). What is the period of the spacecraft's orbit
A single layer of dielectric lens coating is to be deposited on a lens made of a material with refractive index of 1.78. Determine the thickness and the refractive index of the layer
A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. Liquid flows through the first segment at a speed of 9.0 m/s.
An ideal gas is brought through an isothermal compression process. what are the temperature of the gas and the final pressur
A pot containing 1.01 liter of water, initially at 19°C, is placed on a 1051 W electric heating element. How much heat is necessary to boil all the water away
A pendulum clock that works perfectly on Earth is taken to the Moon. (a) Does it run fast or slow there? (b) If the clock is started at 12:00 midnight, what will it read after one Earth day (24.0 h)? suppose that the free-fall acceleration on the ..
Consider the mass spectrometer shown schematically in the figure below. The electric field between the plates of the velocity selector is 5900 V/m, Calculate the radius r of the path for a singly charged ion
An astronaut tries to talk his way out of a traffic violation for running a red light (? = 670 nm) by telling the judge that the light appeared green (? = 540 nm) to him as he passed by in his expensive sports car. If this is true, how fast was the a..
In a liquid with a density of 1450kg/m3 , longitudinal waves with a frequency of 390Hz are found to have a wavelength of 7.50m
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