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Two electric charges one 20 times as strong the other, exert a force of 2.45×10-2N on each other where they are placed 10 cm apart in air. Find the magnitude of each charge.
In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground, what is the launch speed needed to hit the bulls-eye
A 4.60-g lead bullet traveling at 320 m/s is stopped by a large tree. what is the increase in temperature of the bullet
When a rubber band is stretched a distance x, it exerts a restoring force F = -2x + 5x^5. What is the work done in stretching this rubber band from x=0 to x=2.
A 10 m platform diver during his diving can increase his rotation rate from an initial rate of 1.1 rev/s to a maximum of 2.8 rev/s. what is his moment of inertia at his maximum rotation rate
The Sun is approximately a sphere of radius 6.963 105 km, at a mean distance a = 1.496 108 km from the Earth. calculate its surface temperature
A bicyclists accelerates from a stop to 10 m/s in about 15 s. What is the average acceleration of cyclist
A sphere of copper is subjected to 81.1 MPa of pressure. The copper has a bulk modulus of 130 GPa. By what fraction does the radius of the sphere change
Bob walks 320 south, then jogs 450southwest, then walks 320 in a direction 35east of north. Find the direction of the displacement that will return Bob to his starting point by the most direct route
A transformer connected to a 125 V (rms) ac line is to supply 12000 V (rms) for a neon sign. What current rating should the fuse in the primary circuit have
A woman on a bridge 86.8 m above a stream sees a bottle floating along at a constant speed. Calculate the speed of the bottle
When you take a bath, how many kilograms of hot water (51 °C) must you mix with cold water (14°C) so that the temperature of the bath is 36 °C? The total mass of water (hot plus cold) is 192kg. Avoid any heat flow between the water and its externa..
A mass m is attached to an ideal cord of length L (figure at left). What is the tension in the cord at that moment
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