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A cafeteria tray dispenser supports a stack of trays on a shelf hangs from four identical spiral springs under tension, one near each corner of the shelf. Each tray is rectangular, 45.3 cm by 35.6cm, 0.450 cm thick, and with mass 580g. Demonstrate that the top tray in the stack can always be at the same height above the floor, however many trays are in the dispenser. Find the spring constant each spring should have for the dispenser to function in this convenient way. Is any piece of data unnecessary for this determination?
Suppose you have a 9.00 V battery, a 2.2uF capacitor, and a 9.05uF capacitor. Find the total charge stored in the system if the capacitors are connected to the battery in series in C
The current in a coil drops from 3.9 A to 2.7 A in 0.52 s. If the average emf induced in the coil is 12 mV, what is the self-inductance of the coil
Two 7.0mm×7.0mm electrodes with a 0.10-mm-thicksheet of Mylar between them are attached to a 7.0Vbattery, What is the electric field before and after the Mylar is withdrawn
An uncharged capacitor is connected to the terminals of a 2.0V battery, and 9.0?C flows to the positive plate, How much additional charge flows to the positive plate
An electron travelling east with velocity 7.0 x10^5 m/s enters the same electric field region as in the previous problem. How far does it go before being turned backward
A 2kg ball is rolling East (without slipping) down a hill that makes an angle of 30° with the horizontal. find the net acceleration at the instant the ball is kicked
It is found experimentally that the electric field in a certain region of Earth's atmosphere is directed vertically down, Find the net amount of charge contained in a cube 150 m on edge
An aluminum wire with a diameter of 0.105 mm has a uniform electric field of 0.295 V/m imposed along its entire length, What is the drift speed of the conduction electrons
Calculate the gravitational force on a spacecraft 8700km above the Earth's surface if its mass is 1200kg
q1. a long straight wire is in the plane of the page and carries a current of a. point p is also in a plane of the page
A dog sitting 3.7m from a vertical mirror thinks its image is another dog. How far is the image from the dog
a coil whose resistance is 60 ohms and one whose resistance is 40 ohms are connected in parallel to a 120-V line. what is the current in each coil
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