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An elevator (cabin mass 530 kg) is designed for a maximum load of 3300 kg, and to reach a velocity of 3.5 m/s in 3 s. For this scenario, what is the tension the elevator rope has to withstand?
A 20 kg loudspeaker is suspended 2.0m below the ceiling by two cables that are 30 degrees from vertical. what is the tension in the cables
Two identical spaceships are traveling in the same direction. An observer on earth measures the first to have a speed .85c, What is the speed of the second spaceship
The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.315 m and mass 4.89 kg, what should the radius of the disk be
A 3.3 block of wood sits on a table. A 3.0 bullet, fired horizontally at a speed of 480, goes completely through the block, emerging at a speed of 200 .What is the speed of block immediately after the bullet exits.
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
The star Betelguese has a radius and surface temperature of about 10^8 miles and 3000K. The sun has a radius and surface temp of about 5x10^5 miles and 6000k. Find the ratio of the power radiated by the sun and Betlguese Psun/Pbet.
A 2.5kg block slides along a frictionless surface at 1.6m/s. A second block, sliding at a faster 4.0m/sPh, what was the mass of the second block
A television is tuned to a station broadcasting at a frequency of 6.60×10^7 Hz . For best reception, the rabbit-ear antenna used by the TV should be adjusted to have a tip-to-tip length equal to half a wavelength of the broadcast signal
Batteries are rated in terms of ampere-hours (A · h). For example, a battery that can produce a current of 3.00 A for 5.00 h is rated at 15.00 A · h.
A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 39 at 20°C. what is the temperature coefficient of resistivity
A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are vertical to the book and are horizontal.
A typical power plant uses some fuel as the source of heat (QH) to drive a heat engine that does work (W) to drive a generator that is connected to the electrical grid.What is rate of flow and How do we find the power
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