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a box of weight w is sliding down a plane that is frictionless and inclined at angle θ above the horizontal. What is work done on box by force of gravity if box moves distance d?
The heating element of a clothes dryer has a resistance of 11 ? and is connected across a 240-V electrical outlet. What is the current in the heating element
A very long, thin rod carries electric charge with the linear density 28.0 nC/m. It lies along the x axis and moves in the x direction at a speed of 15.0 Mm/s. Find the electric field the rod creates at the point.
water has a mass per mole of 18.0 gmol and each water molecule h2o has 10 electrons.a how many electrons are there in
An experimental rocket car starting from rest reaches speed of 560 km/h after a straight 400-m run on a level salt flat. Assuming that acceleration is constant, (a) what was time of the run and, (b) what is the magnitude of the acceleration?
You are going to change the angle phi2 of applied force on the right side of the Equal Arm Balance keeping the holding force constant and the Balance in equilibrium
a 40 g block of of ice is cooled to -72 C and then is added to 650 g of water in an 80 g copper calorimeter at a temperature of 24C, determine the final temperature of the system consisting of the ice
A landing craft approaches the surface of Penitgy, a planet in a far-away galaxy. The landing craft has two engines attached to the bottom, what is the mass of the landing craft
A piano tuner stretches a steel piano wire with a tension of 765 N. The steel wire has a length of 0.900 m and a mass of 6.75 g. What is the frequency of the string's fundamental mode of vibration
An airplane sends out a radar pulse of frequency4.5x1010Hz. The signal returns to the plane 0.6 ms later. How far is the object that reflected the wave
A 17.5 kilogram block is at rest on a frictionless incline that makes an angle of 25.0 degress with respect to the horizontal. What is the magnitude of the horizontal force
If the circular surface of the upper end of the rod is maintained at 290 K, what is the approximate boil-off rate of liquid helium after the lower half has reached 4.20 K
a turntable platter spinning at 78 revmin comes to a complete stop in 29 s. assuming constant acceleration through what
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