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A child is sitting on a stationary skateboard with a pile of rocks which she throws in one direction in order to make the skateboard travel in the opposite direction. If the rocks each have a mass of 0.70 kg and she can throw them with a speed of 17 m/s relative to the ground, decide the number of rocks she must throw per minute in order to maintain a constant average speed against a 3.5 N force of friction. (Note: because this is a rate, the answer might not be a whole number.) rocks/min
A magnetic field points perpendicular into a 5x12 cm rectangular coil of 44 turns and resistance .25 omega. what magnitude of emf is being induced in the coil
1.7 kilograms of water are changed from liquid water at 100?C into steam at 100?C. determine the change in mass of the water
careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the
A parallel-plate capacitor has circular plates of 6.10 cm radius and 1.10 mm separation. Calculate the capacitance.
Two long thin parallel wires 13.0 cm apart carry28-A currents in the same direction. Determine the magnetic field vector
Two football players go to kick a ball at the same time. One kicks it with a velocity of 25ms-1 at an angle of 12o to the horizontal, What is the resultant velocity of the bal
what was the speed of the bullet at impact with block.
A projectile is fired with an initial speed of 36.7m/sat an angle of 42.1 above the horizontal on a long flat firing range. Decide the total time in the air. Decide the speed of the projectile 1.30s after firing. Determine the maximum height reached ..
The lightbulb in the circuit shown in the figure(Figure 1) has a resistance of 14? and consumes 9.7W of power, find speed of the rod
Calculate the volume charge density of the atmosphere
a 80 kg student consumes 2500 cal each day and stays the same weight. one day he eats 3500 cal and wanting to keep from
a vertical electric field of magnitude 2.00 x 104 nc exists above the earths surface on a day when a thunderstorm is
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