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People who do chin-ups raise their chin just over a bar (the chinning bar), supporting themselves only by their arms. Typically, the body below the arms is raised by about 30cm in a time of 1.0s , starting from rest. Assume that the entire body of a 720 N person who is chinning is raised this distance and that half the 1.0s is spent accelerating and the other half decelerating, uniformly in both cases.
Find the force his arms must exert on him during the accelerating part of the chin-up.
F= _______________N
A suitcase weighing 228N is at rest on the floor of a hotel lobby. The co-efficient of static friction between the suitcase and the floor is 0.49, and the coefficient of kinetic friction is 0.313. With what least amount horizontal force must a bel..
Two parallel plates each of area 7.00 cm^2 are seperated by 3.50 mm of water The electric field between the plates has a magnitude of 2290 N/C, what is the charge stored on each plate
In frame S, event B occurs 2 microseconds after event A and event A occurs at the origion whereas event B on the x-axis at x=3.3km. How fast must an observer be traveling along the +x axis
Two small metallic spheres, each of mass m = 0.212 g, are suspended as pendulums by light strings of length L as shown in the figure below. The spheres are given the same electric charge of 7.9 nC, and they come to equilibrium when each string is ..
what was (a) the negative charge in coulombs on one of them and (b) the positive charge in coulombs on the other.
A converging lens with a focal length of 11.4cmforms a virtual image 7.55mm tall, 16.6cm to the right of the lens. Determine the position of the object
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A block is released from the top of a frictionless incline plane as pictured above. calculate how fast it is moving at the bottom using Conservation of Energy
A 36 g ball is shot from a spring gun whose spring has a force constant of 529 N/m. The spring can be compressed 4 cm. How high will the ball go if the gun is aimed vertically
A uniform rod of mass 3.30×10?2kg and length 0.360m rotates in a horizontal plane about a fixed axis through its center, What is the angular speed of the system at the instant when the rings reach the ends of the rod
Under controlled darkened conditions in the laboratory, a light receptor cell on the retina of a person's eye can detect a single photon of light of wavelength 505 nm, What is the intensity (in W/m^2) delivered to a rod
A 2000kg car accelerates from 20 to 60km/h on an uphill road. Determine the work done by the engine
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