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A rod is being used as a lever, as shown in the figure below. The fulcrum is x1 = 1.79 m from the load and x2 = 3.81 m from the applied force. If the load has a mass of 12.8 kg, what force must be applied to lift the load?
If you shake one end of a taut rope steadily five times each second, what would be the period of the sinusoidal wave set up in the rope
A 6.43 kg ball is thrown upward with an initial speed of 14.34 m/s. Ignore air resistance when answering the following questions. What is the ball's initial kinetic energy
A river flows due south with a speed of 2.30 . A man steers a motorboat across the river; his velocity relative to the water is 4.40. What is the velocity of the boat relative to the earth
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
An electron passes through a point 2.71 cm from a long straight wire as it moves at 36.3% of the speed of light perpendicularly toward the wire
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
A car with energy absorbing bumper hits a tree. The mass of the car is 1500kg, the initial velocity was 10 m/s. What was the energy absorbed
An oscillating mass-spring system has A total energy of 1.18J , amplitude of 9.84cm, Find the spring constant , the mass of the block and the angular frequency
100 kg of water is raised to a height of 50m.the water is used to produce electricity.the electricity produced can run three 100w lamps for 1 hour. what is the efficiency?
The eccentricity,e, of the Moon's orbit is 0.0549 and the mean orbital radius rL=(ab)^1/2 is 384,100 km. Calculate the lengths of the principal axes a and b of the Moon's orbit. How far is the center of Earth from the center of the elliptical orbit? ..
In order to pass a physical fitness test, Marcella must run 1000 m at an average speed of 3.90 m/s. How much time does she have to run the last 750 m
How many 95W light bulbs can you use in a 120V circuit without tripping a 17A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each light bulb is V.)
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