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A 25-cm-diameter cylinder of helium gas is 20cm long and at 19C. The pressure measure reads 120 psi. How many helium atoms are in the cylinder? What is the mass of the helium?
Tendons are strong elastic fibers that attach muscles to bones. To a reasonable approximation, they obey Hooke's law. How much energy is stored in it at that point
When rolling a ball down an inclined plane, the ball rolls 1 cubit in ten seconds. How far will the ball have rolled from its starting point after 20 seconds
A 2kg box slides along a frictionless surface with a speed of 15m/s and approaches a horizontal spring with a spring constant of 2000N/m. If one end is fixed, How far will the spring compress in stopping the box
The sound in a classroom is 61000 times as intense as the minimum threshold of hearing. Find what is the intensity level of this sound in decibels
A grindstone with radius 0.65m starts from rest and rotates counter-clockwise through 3 rev at which point its angular speed is 25 rad/s
Suppose a string of length l under a certain tension has a fundamental frequency of 120 Hz. what is the new fundamental frequency
Two bowling balls, each of mass 5kg, are located so that their centers of mass are 0.5m apart. What is the size of the force of universal gravitation
An electron ( mass = 9.11×10?31 ) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.79 away. It reaches the grid with a speed of 2.96×106 . (You can ignore the gravitati..
A proton is at the origin and an electron is at the point x = 0.42 nm, y = 0.39 nm. Find the electric force on the proton
A circular pipe has a diameter of 3 cm and then narrows to 2 cm. When water (density= 1000kg/m^3) flows during at a certain rate, the pressure is 24.0 kPa in the smaller section and 32.0 kPa in the larger section. There is no height change. What is t..
A crate of mass m (=30 kg) is placed at rest on a (frictionless) inclined plane, which has an angle (= 60o) above horizontal. How long would it take the crate to slide 8 m down the incline?
An unknown substance has a mass of 0.125 kg and an initial temperature of97.5°C. The substance is then dropped into a calorimeter made of aluminum containing 0.285 kg of water initially at25.1°C. calculate the specific heat of the unknown substance
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