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Two men lift a 45 kg block from the floor to a shelf 1.0 meter above the floor without accelerating the block. How much work is done by each man? The answer is 220 J but how?
In the problem above, how much work is done by the earth?
In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 11.42 m to a store. At what angle is the escalator inclined above the horizontal
what will be the frequency of vibrations. At one instant a bicyclist is 70m due east of a park's flagpole, going due south with a speed of 15m/s. Then, 19s later, the cyclist is 65m due north of the flagpole, going due east with a speed of 14 m/s.
Consider an ideal gas at 28.9°C and 0.96 atm pressure. To get some idea how close these molecules are to each other, on the average, imagine them to be uniformly spaced,
A 75 g piece of ice at an initially unknown temperature is placed into a glass of 350 g of water sitting at room temperature when it is 75ºF in the room. The glass and ice come to thermal equilibrium at 4ºC.
The yellow light from a helium discharge tube has a wavelength of 587.5 nm. Calculate the number of lines per centimeter on the grating
a block of mass m=2.00kg is attached to the end of an ideal spring and its initially hanging motionless. with what angular frequency will the block oscillate
An elevator moves downward in a tall building at a constant speed of 3.80 m/s. Estimate the highest floor from which the bolt can fall
A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. How deep is the well
A steel wire of negligible mass is placed under tension by attaching its bottom to the tip of a solid copper cone of height H. what is the wire's new fundamental frequency
What is the electric potential energy of a system that consists of two protons 2.1×10?15 m apart-as might occur inside a typical nucleus
A basketball can be modeled as a thin walled spherical shell with a mass of 0.600 kg and a radius of 12.0 cm. What is the rotational kinetic energy of the ball
Fully stripped (all electrons removed) oxygen (16O) ions are accelerated from rest in a particle accelerator using a total potential difference of 10.0 MV. What is the current of the ion beam, iion, which is the total charge passing per each second
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