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On a warm summer day (29?C), it takes 4.50s for an echo to return from a cliff across a lake. On a winter day, it takes 4.90s . The speed of sound in air is v?(331+0.60T)m/s, where T is the temperature in ?C. What is the temperature on the winter day?
An 8m, 290 N uniform ladders rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50° angle with the ground. How far up the ladder can a 720 N person climb before the lad..
A ray of light is incident on the surface of a block of clear ice at an angle of 34.0° with the normal, Find the angle between the reflected and refracted light.
A small flywheel starts from rest and spins up to speed in 10 seconds. During this time it completes a total of 300 revolutions. what is the angular acceleration of the wheel
A person's prescription for her new bifocal glasses calls for a refractive power of -0.461 diopters in the distance-vision part, & a power of +1.83 diopters in the close-vision part. Compute the near & far points of this person's uncorrected visio..
The water passing over Victoria Falls, located along the Zambezi River on the border of Zimbabwe and Zambia, How much internal energy is produced per kg as a result of the fall
A person pushes a 17.2-kg shopping cart at a constant velocity for a distance of 24.2 m on a flat horizontal surface. Determine the work done by the pushing force
what is the bee's speed at once afterward.
A 10.0kg stone slides down a snow-covered hill (the figure (Figure 1) ), leaving point A with a speed of 10.0m/s. How far will the stone compress the spring
A parallel-plate capacitor is constructed from two 13cm X 13cm electrodes spaced 0.90mm apart. The capacitor plates are charged to ± 20nC, How much energy is stored in the capacitor
In an elementary-particle experiment, a particle of mass m is red, with momentum mc, at a target particle of mass 2squrt (2m) . The two particles form a single new particle (completely inelastic collision).
a heavy box of school books (mass is 50kg) was set down at rest on an inclined street (theta = 30 degrees). Draw a force Diagram of the box
1ml of distilled water is injected into a length of 3mm diametre tubing and sealed at the other end by folding over, Why doesn't water drain out when the tube is hung vertically
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