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A barber's chair with a person in it weighs 2100N. The output plunger of a hydraulic system begins to lift the chair when the barber's foot applies a force of 55N to the input piston. Neglect any height difference between the plunger and the piston. What is the ratio of the radius of the plunger to the radius of the piston?
A green LED has a forward voltage drop of 2.3 V. Estimate the bandgap energy for the semiconductor that makes the green LED
A 420-g ball is attached to one end of a horizontal cord of length L = 2 m and the other end is fixed, what will be its speed at the lowest point of its path
At the beginning of a basketball game, a referee tosses the ball straight up with a speed of 5.03 m/s. What is the minimum time that a player must wait before touching the ball
The electron mass is 9×10?31 kg. What is the magnitude of the momentum of the electron
The left ventricle of the heart accelerates blood from rest to avelocity of +21cm/s. If the displacement of the blood during the acceleration is +1.5 cm, determine its acceleration (incm/s2).
A 13? F capacitor is joined in series with a 35? F capacitor, What is the potential difference across the first capacitor
A 42.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.28*10^2 m/s from the top of a cliff 140 m above level ground, What is the initial total mechanical energy of the projectile
A circuit similar to the one you will b e measuring has a current of 0.1 A flowing when the voltage is 2. 5 V, What color code does the res istor probably have
How far will it coast before starting to roll back down. In addition, snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find the acceleration of the sled and child.
A young person has a near point NP= 14.4cm and a far point FP = 3.54m. using a ideal near point 25cm, determine the proper corrective lens for this person
what is the compressional stress that the arm withstands during the crash?
Scientists in a laboratory produce a sound wave in a simulated environment (air) with a velocity of 479 m/s. What is the temperature (in Kelvin) of the environment
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