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A charged particle of mass 8.39×10?4 kg starts from rest and accelerates through a potential difference of +25,000 V to reach a speed of 1240 m/s. What is the charge on this particle?
If a transformer steps the voltage down from 8800 V (at the pole) to 120 V (at the building) and it is to deliver 1000 kW to the building at 80% efficiency, what is the ratio of primary turns to secondary turns
A car drives north at 42 mi/h for 10 {rm min} and then turns east and goes 5.0 {rm mi} at 62 mi/h. at last, it goes southwest at 30 mi/h for 6.0 {rm min}.
A runner covers one lap of a circular track 40.0m in diameter in 63.3s. what were her average velocity(in m/s) for that half-lap
A car of mass 1203 kg collides head-on with a parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic. what is the initial speed of the car
A wall is composed of two materials, material 1 has a thickness of 3.49 cm and a thermal conductivity of 0.1 J/msCo while material two has a thickness of 7.01 cm, what is the energy loss per second to the nearest watt
A negative charge moves in the direction of a uniform electric field. Does the charge move to a position of higher or lower potential
A 4kg pumpkin is sitting stationary on a platform. What is the total energy of the pumpkin measured by a person standing on the platform
Suppose 1.0 mol of a monatomic ideal gas initially at 10 L and 348 K is heated at constant volume to 696 K, What is the efficiency of the cycle
An ac generator consists of a coil with 50 turns of wire, each with an area of 0.02 m2. What is the resistance of the coil
What is the change in internal energy of a system that takes in 2.80 ? 106 J of heat, and does 4.50 ? 105 J of work while dissipating 9.00 ? 106 J of heat
An object (it could be the crown that Archimedes had studied) made of gold and copper has a mass of 5.00 kg. determine the the volume percentage of each metal
a spring of stiffiness k supports a box of mass M in which is placed a blokk of mass m. find the force of reaction between the blook and the box
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