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Q1. A positive charge of q = 3.5 µC is pulled on by two negative charges. One, -2.0 µC, is 0.050 m to the north and the other, -4.0 µC, is d = 0.029 m to the south. What total force is exerted on positive charge?
Q2. If air drag is negligibly small, how fast is a sequoia cone moving while it reaches the ground if it dropped from the top of a 114 tree?
Q3. Liquid nitrogen has a boiling point of 77.3 K and a latent heat of vaporization of 2.01 105 J/kg. A 60.0-W electric heating element is immersed in an insulated vessel containing 46.5 L of liquid nitrogen at its boiling point. How various kilograms of nitrogen are boiled away in a period of 7.50 h?
A thin spherical shell of mass 4.00 kg and diameter 0.200 m is filled with helium (density ? = 0.180 kg/m3). How long will it take for the top of the shell to reach the water surface
An electron confined in a one-dimensional box is observed, at different times, to have energies of 32.5 eV, 57.8 eV, What is the length of the box
A cubic foot of lead that weighs 700 lb is submerged in water. What is the buoyant force acting on it? The volume of one cubic foot of water weighs 62.4 lb
Cost of electricity varies but typical values are around $0.15/kWh. Using this price, calculate the cost of making a piece of toast in 3.00 min with a 980W toaster
A 5 kg object is dropped from rest 2.5m above the ground. What is the kinetic energy of the object just before it hits the ground
An automobile travels on a straight road for 44 km at 49 km/h. What is the average velocity (in km/h) of the car during this 88 km trip? (Assume that it moves in the positive x direction.)
A small ball of mass 0.60 kg is attached to one end of a 1.15 m long massless rod, and the other end of the rod is hung from a pivot
How long does it take for the grinding wheel to stop ? Through how many radians has the wheel turned during the interval found in.
A softball having a mass of 0.45 kg is pitched horizontally at spring with spring constant 78 N/m. how fast was the softball moving initially
A 500 kg mass is released at rest from a distance of two Earth radii above the surface of the Earth. Find the speed of the mass
A constant force of 46.3 N, directed at 28.7o from horizontal, pulls a mass of 14.7 kg horizontally a distance of 3.09 m
One of the tenets of the pseudoscience (i.e., "false science") of astrology is that, in some mysterious way, the positions of the planets at the time of the person's birth somehow influence the characteristics of that person.
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