Physics, 19.11.2019 04:31 fortwill05
Arailroad hopper car filled with sand is rolling with an initial speed of 15.0 m/s on straight horizontal tracks. ignore frictional forces on the railroad car. the total mass of the car plus sand is 89000 kg. the hopper door is not fully closed, so sand leaks out the bottom. after 20 min, 17000 kg of sand leaked out. what then is the speed of the railroad car?
Answers: 3
Physics, 21.06.2019 21:00
An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?
Answers: 2
Physics, 22.06.2019 05:40
Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.
Answers: 3
Physics, 22.06.2019 11:10
Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest.2000 kg car going 5m/s500 kg car going 20 m/s1000 kg car going20m/s500 kg car going10m/s1000 kg car going10/s4000 kg car going 5m/s 0 0 603
Answers: 3
Physics, 22.06.2019 14:30
Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?
Answers: 3
Arailroad hopper car filled with sand is rolling with an initial speed of 15.0 m/s on straight horiz...
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