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A key falls from a bridge that is 46 m above the water. It falls directly into a model boat, moving with constant velocity , that is 15 m from the point of impact when the key is released. What is the speed of the boat?
A Young's interference experiment is performed with blue-green laser light. The separation between the slits is 0.500 mm, and the screen is located 3.12 m from the slits. The first bright fringe is located 3.22 mm from the center of the interferen..
The horizontal and vertical components of the initial velocity of a football are 20m/s and 30m/s respectively. To what maximum height doe the football rise
A bunch of grapes is placed in a spring scale at a supermarket. The grapes oscillate up and down with a period of 0.32s, What is the weight of the grapes
The land speed record of 13.9 m/s (31 mi/h) for birds is held bythe Australian emu. An emu running due south in a straight line atthis speed slows down to a speed of 10.5 m/s in 3.3 s.Assuming that the acceleration remains the same, what is the bird'..
A 300kg piano is being lowered into position by a crane while two people steady it with ropes pulling to the sides. What is the tension in the vertical main cable supporting the piano
Calculate the dc voltage applied to the circuit.
Bowling balls are roughly the same size, but come in a variety of weights. Given its official circumference of roughly 27.2 inches, calculate the heaviest bowling ball
A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 50.00°. Find the dispersion of the slab, which is defined as the difference in the angles of refraction for the two wavelengths
the number of radioactive nuclei present at the state of an experiment is 2.78e15. the number present twenty days later is 5.14e14. what is the half life in days of the nuclei
Consider a violin string with a vibrating length of 30 cm. If the speed of a wave on this string is 250 m/s, what is the tension in the string? Hint: You will have to estimate the diameter of the string. Assume the density is the same as that of s..
The velocity of a plane relative to still air is 135 mr/hr. The pilot wants to fly straught north over the ground. What is the direction of the wind relative to the ground
A 0.66kg mass at the end of a spring vibrates 4.0 times per second with an amplitude of 0.15m. Determine the total energy of the system
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