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A boy pulls a box with a mass of 30 kg with a force of 25 N at 30 deg angle in the North East direction. Ignoringfriction, what is the acceleration of the box? What is the normalforce exerted on the box by the ground?
a parallel-plate capacitor has 5.0 cm x 5.0 cm electrodes with surface charge densities 1.0 x 10-6 cm2. a proton
A 300 DC power supply has fully charged a 15 mF capacitor. The charged capacitor is connected to a 20 mH inductor. find the magnetic energy in the inductor
question a nearsighted person wears glasses to correct the problem. the lenses in the glasses have a focal length of
Estimate how far from a piece of paper you must hold the lens to produce a sharp image of a streetlight 40 ft. Overhead.
Two cars a and b are travelling in the equal direction with velocities A and B(A>B). While the car a is at a distance behind car b, the drive of car a applies break producing uniform retardation r, there will b no collision while.
The syringe must be heated to high temperatures to sterilize it. When the syringe is at its maximum temperature, the number of oxygen molecules is 6.5 x 1019, what is the rms speed of the oxygen molecules
The left ventricle of the heart accelerates blood from rest to avelocity of +27cm/s. If the displacement of the blood during the acceleration is +1.8 cm, determine its acceleration (incm/s2).
A 2.16kg object attached to a spring moves without friction and is driven by an external force given by the expression F(t) = F0 sin(2Ï€t), find the period of the driven system when at resonance
A diver springs upward from a three-meter board. At the instant shecontacts the water her speed is 8.90m/s, How much time does she spend in the air
A charge of 2.05mC is placed at each corner of a square 0.160m on a side. Determine the magnitude of the force on each charge
A 2.00×10^4 kg railroad car is rolling at 4.00m/s when a 5000kg load of gravel is suddenly dropped in. What is the car's speed just after the gravel is loaded
define How fast are the waves moving.
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