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Question: A ball falls from a 30 meter tower. How fast is it going when it has fallen two-thirds of the way to the ground? Assume air resistance is negligible.
I want you to explain the physics in this question.
whenever the velocity changes there is a non-zero acceleration. the change can be in only the magnitude of the velocity
A 50-gram ice cube at 0 degrees celsius is heated until 40 grams has become water at 100 degrees celsius and 5.0 grams has become steam at 100 degrees celsius
A 7.0mW laser beam has a circular cross section with diameter 0.80mm, What is the maximum radiation pressure that this laser can exert on a mirrored surface
Two sounds differ in intensity level by 4.62 dB. What is the ratio of the intensities of these two sounds? (Let I1 be the intensity of the first (higher) sound and I2 be the intensity of the second (lower) sound.)
A gold prospector finds a solid rock that is composed solely of quartz and gold.The total mass and total volume of the rock are, respectively, 13.0 kg and 3.50 10-3 m3. determine the mass mG of gold in the rock
In the figure, a man is standing near a gate and a flag pole. The gate is 15 ft from the pole. How far is the man from the gate
A child operating a radio-controlled model car on a dock accidentally steers it off the edge. Find the car speed at the instant it drives off the edge of the dock
Two rocket ships approach Earth from opposite directions, each with a speed of 0.8 c relative to Earth. What is the speed of one ship relative to the other?
question1two identical clocks a and b are at first synchronized at the bottom inside a vacuum chamber xed on the
A car is traveling down around a banked curve in the road. The curve has a radius of 300 m and is banked at an angle of10.0o. (a) At what speed is no friction required?
While Galileo did not invent the telescope, he was the first known person to use it astronomically, beginning around 1609. How long would this telescope be between the two lenses
The nucleus of a hydrogen atom is a single proton, which has a radius of about 1.2 × 10-15 m. What is the ratio of the density of the hydrogen nucleus to the density of the complete hydrogen atom
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