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A bolt comes loose from the bottom of an elevator thatis moving upward at a speed of 5.42 m/s. The boltreaches the bottom of the elevator shaft in 2.90 s. Howhigh up (in m) was the elevator when the bolt came loose?
In addition to dark matter cosmologists have proposed dark energy. The reason for this was the discovery of: A) slowing down of the expansion of the universe B) cosmic background radiation C) acceleration of the expansion of the universe D) gravitati..
A proton, an electron, and an alpha particle (of charge +2e) form an equilateral triangle of side length 2.19×10-10 m. What is the electric potential energy of the three-particle system
A closed box is filled with dry ice at a temperature of ?78.4 °C, while the outside temperature is 22.8 °C. Find the thermal conductivity of the material from which the box is made
A 100-watt light bulb is brighter than a 25-watt light bulb because it uses more power. Which bulb has a greater resistance, the 100-watt or the 25-watt light bulb
What is the tangential acceleration of a bug on the rim of a 13.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 80.0 rev/min in 3.60 s
A painter (m=70 kg) is standing a distance of 0.6 m from the top of a ladder (mass 40 kg and length 2.5 m). Find the conditions for static equilibrium of the ladder with the painter on top
q1. radio amateurs are permitted to communicate on the 20-meter band. what frequency of radio waves corresponds to a
a rectangular wooden slab with length =2.0m, width=2.0m, and height=1.0m is used as a floating device in a play water pond. find the distance from the top of the wood to the water surface
A 38 ohm resistor is made from a coil of copper wire whose total mass is 11.2 g. Find out the length and diameter of the wire.
A spherical bowling ball with mass m = 4 kg and radius R = 0.108 m is thrown down the lane with an initial speed of v = 8.8 m/s. How far does the bowling ball slide before it begins to roll without slipping
A lab technician uses laser light with a wavelength of 670 nm to test a diffraction grating. When the grating is 40.2 cm from the screen, the first-order maxima appear 6.02 cm from the center of the pattern. How many lines per millimeter does this gr..
A model of a helicopter rotor has four blades, each 3.60 m in length from the central shaft to the bladetip. What is the radial acceleration of the blade tipexpressed as a multiple of the acceleration due to gravity,g?
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