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When a man stands on his scale, it reads 92.6 kg. when hepulls down on a chin-up bar installed over the scale, the reading decreases to 75.1 kg. what is the magnitude of the force he exerts on the chin-up bar?
In the lungs there are tiny sacs of air that are called alveoli. An oxygen molecule (mass = 5.30 x 10-26 kg) is trapped within a sac, and the uncertainty in its position is 0.140mm. What is the minimum improbability in the velocity of this oxygen ..
A uniform beam having a mass of 60 kg and a length of 2.8 meter isheld in place at its lower end by a pin. Its upper end leansagainst a vertical frictionless making an angle of 40 degrees withthe horizontal. What is the magnitude of the force by t..
You want a screen to be illuminated with an intensity of 662 mW/m2. The screen is 10.05 m away from the light source, What is the power of the light source
A 65 gice cube at 0°C is heated until 60g has become water at 100°C and 5.0 g has become steam at 100°C. How much energy was added to accomplish the transformation
What is the minimum rate of rotation, in revolutions per minute, required for the spheres to contact the cylinder wall?
A 3.3 block of wood sits on a table. A 3.0 bullet, fired horizontally at a speed of 480, goes completely through the block, emerging at a speed of 200 .What is the speed of block immediately after the bullet exits.
In exercising, a weight lifter loses 0.123 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. find the change in the internal energy of the weight lifter
A lightweight string of length 60cm is attached to the ceiling at points separated by distance. Three objects of equal mass are hung from the string, separating the string into 4 equal segments of length L. If θ = 40, find the measure of angle φ a..
A 5kg mass starts from rest and slides down on an inclined plane, hits a bumper at the bottom of the inclined plane and bounces back up the inclined plane and comes to rest again. During the collision with the bumper, 0.7j of energy is lost. The m..
Consider a small virus having a diameter of 10nm . The atoms of the intracelluar fluid are confined within this "box". What is the ground state energy (in eV) of a sodium ion confined in such a box
An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 21.0 days on average to complete one nearly circular revolution around the unnamed planet.
Two rubber bands cause an object to accelerate with acceleration a. How many rubber bands are needed to cause an object with half the mass to accelerate five times as quickly
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