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Q. While combing your hair, you scuff off electrons from your hair onto the comb. Is your hair after that positively charged or negatively charged? How about the comb?
Q. A satellite is placed between the Earth and the Moon, along a straight line that connects their centers of mass. The satellite has an orbital period around the Earth that is the similar as that of the Moon, 27.3 days. How far away from the Earth must this satellite be placed?
Compute direction of Sparkys net displacement
A 2200 kg sport utility vehicle travelling at 86 km/h can be stopped in 0.15 s if it hits a concrete wall. Presume a 60 kg person was in the car that hit this wall. The velocity of the person equals that of car both before and after the crash, and..
A gymnast with mass m1 = 40 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 110 kg and length L = 5 m. Each support is 1/3 of the way from each end. at first the gymnast stands at the left end of..
Does an apple tree exert a gravitational force on the earth and if so, how large of a force? Consider and explain this question when the apple is attached to the tree, and when it is falling.
A hydrometer is used to measure the specific gravity of liquids. For a sure liquid a hydrometer reading indicates a specific gravity of 1.15. What is the liquid's density and specific weight? State the answer in SI units.
Radioactive decay of granite and other rocks in the Earth's interior provides sufficient energy to keep the interior molten, heat lava, and supply warmth to natural hot springs.
Evaluate maximum altitude?
A 36.0 g bullet moving at 478 m/s strikes a 3.7 kg bag of flour that is on ice, at rest. The bullet passes during the bag, leaving at 255 m/s. How fast is the bag moving when the bullet exits.
what is the net workdone on the weights.A child slides down a hill on a toboggan with an acceleration of 1.8 m/s2. If she starts at rest, how far has she traveled after following lengths of time.
A worker on a scaffolding 65 ft above the ground needs to lift a 390 lb bucket of cement from the ground to a point 30 ft above the ground by pulling on the rope weighting 2 lb/ft . Set up the integral of how much work is required (just give the i..
An AA battery is connected to a parallel-plate capacitor having 4 diameter plates spaced 3 apart. How much charge does the battery move from one plate to the other.
Two positive charges of 7.40 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction 0.72. If they are originally far apart.
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