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Why do we write F=Gm1m2/d2 for the gravitational force on an object when it is far from the Earth but F=mg for the gravitational force on it when it is near the Earth's surface?
An 18-gauge copper wire (diameter 1.02 mm) carries a current with a current density of 1.60×106A/m2. Calculate the drift velocity of electrons in the wire
What is the minimum area (in square meters) of the top surface an ice slab 0.251 m thick floating on fresh water that will hold up a 1060 kg automobile
There are two blocks connected by a string and tied to a wall, with an angle of 33o. Find what is the tension in the string connecting the two blocks
An aluminum baseball bat has a length of 0.817 meter at a temperature of 19.5°C. Find what is the final temperature of the bat
A small metal sphere has a mass of 0.19g and a charge of -27.0nC. It is 10 cm directly above an identical sphere with the same charge. What is the magnitude of the force between the spheres
If the radius of the equipotential surface of point charge is 13.5 m at a potential of 2.10 kV, what is the magnitude of the point charge creating the potential
A spring is used to propel a 0.400-kg hockey puck across level (frictionless) ice that becomes a rough (not frictionless) ramp inclined at 27°. If the puck reaches a maximum vertical height of 14 cm on the ramp, what distance does it travel along t..
An archer shoots an arrow with a velocity of 45.0 m/s at an angle of 50.0° with the horizontal. An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up with the least initial speed necessary to m..
A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. If he hits the ball with a velocity of 7.5 m/s and then stops, what impulse did he imply on the ball
An airplane travels 277 m down the runway before taking off. Assuming that it has constant acceleration, if it starts from rest and becomes airborne in 9.00 s how fast is it moving at takeoff?
The step-down transformer in a local neighborhood reduces the voltage from a 7,200 V line to 120 V. What current does the transformer draw from the line
A cylindrical capacitor has an inner conductor with a radius of 1.2 and an outer conductor with a radius of 3.9 . The two conductors are separated by vacuum, and the entire capacitor has a length of 2.4 .
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