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A painter weighing 900 N stands on a massless plank 5 m long that is supported at each end by a stepladder. If he stands 1m from one end of the plank, what force is exerted by each stepladder?
a sinusoidal wave traveling on a string is moving in the positive x-direction. the wave has a wavelength of 4m a
A person of mass 50 kg rides a loop the loop (vertical circular track) at an amusement park. find the normal force exerted at the bottom of the loop
consider a total-flow geothermal system using the same well bottom conditions as problem 13.2. the fluid enters the
You place an 83.3 ohm resistor across the terminals of an unknown battery of negligible internal resistance and measure a current of 0.453 Amp flowing through it. What is the potential difference across the terminals of the battery
The age of a piece of wood from an archeological site is to be determined using the Carbon-14 method. What is the age of the sample in years
a potter;s wheel is a uniform disc of diameter 1m and a mass of 70kg. what min total of friction force must be applied to the disk
A rectangle has the dimensions of 3.20 m x 2.00 m when viewed by someone at rest by respect to it. When you move past the rectangle along one of its sides, the rectangle looks like a square
Consider a conical pendulum with a bob of mass m = 68.0 kg on a string of length L = 10.0 m that makes an angle of ? = 7.00° with the vertical. Determine the radial acceleration of the bob
White light (400-700 nm) is incident on a 600 line/mm diffraction grating. What is the width of the first-order rainbowon a screen 2.0 m behind the grating?
A sports car traveling along a straight line increases its speed from 20.4 mi/h to 60.4 mi/h. What is the ratio of the final to the initial kinetic energy
A Carnot engine has a power output of 240 kW. The engine operates between two reservoirs at 9 C and 661 C. How much thermal energy is absorbed each hour
The potential energy of two small particles in water is approximately: Write down a formula for the force between them
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