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What average force is necessary to bring a 49.9-kg sled from rest to a speed of 3.1 m/s in a period of 19.9s? Assume frictionless ice.___ N in the direction of the sled's motion
a 9.0 kg hanging weight is connected by a string over a pulley to a 5.0 kg block sliding on a flat table. if the
A 1.60 cylindrical rod of diameter 0.550 is connected to a power supply that maintains a constant potential difference of 15.0 across its ends, Find the temperature coefficient of resistivity at 20 for the material of the rod
A metal rod is 40.127cm long at 20.3 oC and 40.149cm long at 45.0 oC. Calculate the average coefficient of linear expansion of the rod's
Suppose that 0.0025 m^3 of gas in a cylinder is compressed by a piston down to 0.001 m^3 while 675 J of heat flows out of the gas. what was the change in its internal energy
Two police cars have identical sirens that produce a frequency of 560 Hz. Find the speed of the approaching police car
a 310 g- paperback book rests on a 1200 g -textbook. a force is applied to the textbook and the two books accelerate
A straight 2.00-m, 150-g wire carries a current in a region where the earth's magnetic field is horizontal with a magnitude of 0.55 gauss. a) What is the minimum value of the current in this wire so that its weight is completely supported by the m..
a metal block of mass 1.230 kg is hanging from a string. the tension in the string is 7.184 n. the block is submerged
two straight rods 55 cm long and 1.4 mm apart in a current balance carry currentieach in opposite directions. if a mass
If a electron after being accelerated by a potential difference of 100 V enters in a uniform magnetc field of 1T perpendicular. Calculate its radius of circular path described by it
A Martian leaves Mars in a spaceship that is heading to Venus. On the way, the spaceship passes earth with a speed v = 0.86c relative to it. What is the time of the trip (in seconds) as measured by the Martian
A 3 kg box is pushed across a frictionless horizontal floor with a force F = 20 N that makes an angle of 25° with the horizontal. The box moves 18 m.
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