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Q. Consider the four charges , in which d = 2 cm, q = 2 nC, the +x-axis points to the right, and the +y-axis points up. What is the force on the 1 nC charge at the bottom? Give your answer in component form, using i and j for and , respectively.
Q. If a car traveling at 52 km/h will skid 24 m when its brakes lock, how far will it skid if it is traveling at 120 km/h when its brakes lock?
At one point in a pipeline, the water's speed is 3 m/s and the gauge pressure is 4.00×10^4 Pa. Find the gauge pressure at a second point in the line 11 m lower than the first if the pipe diameter at the second point is twice that at the first.
The length of the mercury column is 4.0cm in pure melting ice and 28.0 cm in the steam. Compute the temperature for a length of 22.0.
The coefficient of kinetic friction
Two boats start together and race across a 56-km-wide lake and back. Boat A goes across at 52 km/h and returns at 56 km/h. Boat B goes across at 36 km/h, and its crew, realizing how far behind it is getting, returns at 79 km/h. Turnaround times are n..
A straight horizontal wire carries a current of 6.50 μA. An electron is moving above the wire the direction parallel to it and in the same direction as the conventional current in the wire.
A brick is released with no initial speed from the roof of a building and strikes the ground in 2.70 {rm s}, encountering no appreciable air drag. How tall is building? How fast is the brick moving just before it reaches the ground.
A uniform plank of length 5.8 m and weight 217N rests horizontally on two supports, with 1.1m of the plank hanging over the right support. To what distance x can a person who weighs 460 N walk on the overhanging part of the plank before it just beg..
calculate the speed of the block at the instant the dielectric leaves the capacitor assuming it starts at rest and that the voltage across the capacitor after the dielectric is removed is measured to be 900 V.
A wooden raft has a mass of 76 kg. When empty it floats in water (density 1000 kg/m3) with 51 percent of its volume submerged. What mass of sand can be put on the raft without it sinking.
A 2.10 sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats. The reflected sound is then mixed with the transmitted soun..
Describe briefly a current health problem. A father racing his son has half the kinetic energy of the son, who has one-third the mass of the father. The father speeds up by 2.5 m/s and then has the same kinetic energy as the son.
A car is traveling at 27 m/s when the driver spots a large pothole in the road a distance 44 m ahead. She immediately applies her brakes. If her acceleration is -9.7 m/s2, does she arrange to stop before reaching the pothole.
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