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A box of mass 12.0 kg is sitting on the floor of an elevator which is accelerating upwards at 5.1 m/s2. If the coefficient of static friction between the box and the floor if 0.30, what is the minimum horizontal force needed to just start moving the box?
what is the electric force between the proton and electron inside of a hydrogen atom? What must the speed of the electron be? Radius=0.47 x 10^-9.
Presume the electron is at the midpoint between the proton.
A step-down transformer has 2000 turns on the primary and 300 turns on the secondary, what is the secondary voltage amplitude
A high-voltage transmission line with a resistance per unit length of 0.320 ?/km carries a current of 960. A. Calculate the power loss due to resistance in the line
A 1,200 kg car going 25 m/s is brought to stop using its brakes. Let's assume that a total of approximately 20 kg of iron in the brakes, What was the car's original kinetic energy
A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. How fast are the waves traveling
A stone is thrown out the window of high rise builind at an angle of 37.5° to the horizontal with an initisl speed of 22.0 m/d. from what height was the stone launched
A small metal bead, labelled A, has a charge of 29 nC. It is touched to metal bead B, initially neutral, so that the two beads share the 29 nC charge, but not of necessity evenly. When the two beads are then placed 5.0 {rm cm} apart, the force betwee..
A merry-go-round starts from rest and accelerates with angular acceleration 1.2×10?2 for 13. What is its average angular speed during the spin-up time
A block of wood of mass m1 = 1.00 kg slides to the right on a frictionless horizontal table with a speed of 30.00 m/s. How much is the spring compressed by the wood
A passenger car traveling down a rough road bounces up and down at 1.0 with a maximum vertical acceleration of 0.17 , both typical values. What is the maximum speed of the oscillation
The length of a beam increases by 1.46mm when its temperature is raised from 44.92oC to 90.5 oC. What is the length of the beam at the initial temperature? The thermal expansion coefficient of the material is 0.000053 /oC.
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