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A 57.0 kg skateboarder starts out with a speed of 1.70 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the skateboarder is 6.10 m/s.
Calculate the change (?PE = PEf - PE0) in the gravitational potential energy.
Two waves traveling on a string in the same direction both have a frequency of 125 Hz, What is the amplitude of the resultant wave if the original waves differ in phase by each of the following values
A 150-kg (including all the contents) rocket has an engine that produces a constant vertical force (the thrust) of 1680 N, Find the acceleration of the rocket
A monatomic ideal gas is heated while at a constant volume of 1x10^-3 m^3, using a 10 watt heater. How long was the heater on
Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9300 N. Illustrate what does the scale read during the acceleration?
Particle A of charge 5.00x10-4 C is at the origin, particle B of charge -5.00x10-4 C is at (3.00 m, 0) and particle C of charge 3.00x10-4 C is at (0, 2.00 m).
10-nC point charge is located at the center of a thin spherical shell of radius 8.0 cm carrying -20 nC distributed uniformly over its surface. What is the magnitude of the electric field 2.0 cm from the point charge
A balloon rises at at constant velocity of 3m/s. A rock is released over the side. 4.5 seconds later this rock hits the ground. compute the height of the rock when it is halfway between the balloon and the ground. Assume Earth gravity (-9.81m/s), ..
A system consisting entirely of electrons and protons has a net charge of 1.71×10?15 C and a net mass of 4.76×10?23 kg. how many protons are in this system
You pull your 55.00 kg friend on a 5.00 kg sled across a patch of snow. You pull using a 48-N force on a rope that makes a 35 degree angle with the horizontal. If the friction force between the sled and the snow is a mere 5-N what is the normal fo..
A projectile ,was launched vertically from the surface, of the Moon rises to an altitude of 330km. What would be the projectile's initial speed
q1. an emf is induced in a conducting loop of wire 1.22 m long as its shape is changed from square to circular.
Mary applies a force of 70 N to push a box with an acceleration of 0.49 m/s2. When she increases the pushing force to 80 N, What is the mass of the box
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