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a sled is resting on packed snow. the coefficient of kinetic friction is now only 0.12. if a person weighing 650 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?
Heat flows into an ideal gas at a constant volume. The pressure increases from 1.5 atm to 5.5 atm. What is the total heat flow of the process
An electric utility company supplies a customer's house from the main power lines (120 V) with two copper wires, Find the potential difference at the customer's house for a load current of 109 A
A novice skier, starting from rest, slides down a frictionless 41.0 incline whose vertical height is 230.How fast is she going when she reaches the bottom.
A cat stands on a board of wood in a frozen frictionless pond. The mass of the cat is 4.0 kg, and the mass of the board is 3.0 kg. how far does the cat move in relation to the pond
Like all stars, our sun converts mass into energy which radiates (spherically) in all directions. Calculate the rate at which the sun is losing mass
An eagle is flying horizontally at 5.7 m/s with a fish in its claws. How much time passes before the fish's speed doubles
Two point charges totaling 7.00 µC exert a repulsive force of 0.100 N on one another when separated by 0.719 m. What is the charge on each? smallest charge largest charge (b) What is the charge on each if the force is attractive? smallest charge l..
Presume you carry a bag of groceries weighing 148 N from your car to the kitchen, a distance of 59m, without raising or lowering the bag.
Antimony (atomic number 51) is composed of two principal isotopes, antimony-121, which has a mass of 120.904 atomic mass units, What is the atomic mass of natural antimony?
he car is suspended beneath the helicopter by a steel cable. Illustrate what is the lift force exerted on the air by the helicopter's rotor?
question1a knight sits on a castle wall during a siege. to while away time he notes that boulders catapulted from below
A rotating door is made from four rectangular sections, as indicated in the drawing. The mass of each section is 80 kg. A person pushes on the outer edge of one section with a force of F = 75 N that is directed perpendicular to the section. Find out ..
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