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A 10.5-kg uniform board is wedged into a corner and held by a string at a 50 degree angle. Calculate the tension in the string. Hint: take torques about the corner and assume any length for the board.
As structural steel rod has a radius R = 9.5 mm and a length L = 81 cm. A force F = 6.2 × 104 N (about 7 tons) stretches it along its length. What is the tensile stress in the rod
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
Calculate the impulse experienced when a 66 kg person lands on firm ground after jumping from a height of 2.8m. Estimate the average force exerted on the person's feet by the ground if the landing is with bent legs
you take some data with nichrome wire and you have a plot of r vs. la-1 with the following equation from your computer
a lens with a focal length of 15 cm is placed 45 cm in front of a lens with a focal length of 5.0 cm. how far from the
A runner rounds a circular curve of radius 24.0 m at a constant speed of 5.25 m/s. What is the magnitude of the runner's centripetal acceleration
A hotel elevator ascends 140 {rm m} with a maximum speed of 4.59 {rm m/s}. Its acceleration and deceleration both have the magnitude of 1.93 {rm m/s^2}. How long does it take to make complete trip from bottom to top.
In an experimental radiation therapy, an equivalent dose of 0.400rem is given to a localized area of tissue with a mass of 0.170kg by 0.800Mev protons. How many protons are absorbed by the tissue
Jane looking for tarzan, is running at top speed (5.7m/s) and grabs a vine hanginf vertically from a tall tree in the jungle. How high can she swing upward
In the school cafeteria, a trouble-making child blows a 10.0 g spitball through a 30.0 cm straw. What was the maximum force on the spitball
A plank 2.00 cm thick and 16.9 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below, find the shear modulus of the wood
A proton moves at a speed of 870 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.70 T
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