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a 145 Kg football player applies a force of 520 N horizontally on the opposing 125 Kg quarterback, while pushing him backwards 3.3 m at a constant speed before being tackled. How much work did the tackler do while pushing?
Resistances of 2.9 ?, 4.5 ?, and 6.8 ? and a 17.1 V battery are all in series. Find the potential difference across the first (2.9 ?) resistor.
A mini-fridge needs to maintain a temperature of 277 K. The air outside the mini-fridge has a temperature of 301 K. What is the coefficient of performance of this mini-fridge
Two cars collide at an intersection. Car A, with a mass of 2000kg , is going from west to east, How fast was car A going just before the collision
An elastic cord is 69 cm long when a weight of 57 N hangs from it but is 70 cm long when the weight of 75 N hangs from it. What is the "spring" constant k of this elastic cord.
The school bus picks up Brian in front of his house and takes him on a straight-line 3.6 km bus ride to school in the positive direction. He walks home after school. If the front of Brian's house is the origin.
What is effectiveness of battery as an energy storage device
Solar Energy Reaches the earth at the rate of about 1400 watts per sqaure meter of surface perpendicular to the direction of the sun. By how much does the mass of the sun decrease
A 65- kg child sits in a swing suspended with 3.4- m-long ropes. The swing is held aside so that the ropes make an angle of 60 o with the vertical
A gear system uses 300 joules of energy to move a 20-newton mass 10 meters to the right. How much energy was converted to heat
how fast the air flow over the upper surface of the wing. What is the coefficient of kinetic friction between the box and the floor.
Compute the velocity of the electron assuming that hydrogen is described by the Rutherford-Bohr model
A 4.0cm tall apple is 20cm in frount of a plano-convex lens of focal length 75cm. Find the location of the image of the apple
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