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A string under a tension of 49.0 N is used to whirl a rock in a horizontal circle of radius 2.40 m at a speed of 20.8 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string on the table is 1.00 m long and the speed of the rock is 52.0 m/s, the string breaks. What is the breaking strength, in newtons, of the string?
A spacecraft is in orbit around a planet. The radius of the orbit is 3.2 times the radius of the planet, What is the period of the spacecraft's orbit
A set of crash tests consists of running a test car moving at a speed of 11.8 m/s (26.4 mi/hr) into a solid wall. Calculate the size of the average force which acts on the dummy during that time
he electric field in a particular region of space is found to be uniform, What is the change in electric potential energy of a charge q = 6.7 uC if it is moved from (x, y) = (20 cm, 45 cm) to (5 cm, 30 cm)
A metal sphere centered at the origin has a surface charge density that has a magnitude of 24.1 nC/m2 and a radius less than 2.00 m. What is the sign of the charge on the sphere
Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.5 mm. What is the resistance ratio RA/RB, measured between their ends
You are pushing a refrigerator across the floor of your kitchen. You exert a horizontal force of 273 N for 7.2 s, What is the work done by friction
Multiple-Concept Example 8 provides useful background for part b of this problem. What is the angular displacement (in rad) of each wheel
Calculate the y-component of the magnetic force.
An electron with an initial speed of 4.00×105m/sis brought to rest by an electric field, What was the initial kinetic energy of the electron, in electron volts
A diverging lens has a focal length of 71.5 cm. A real object is placed 30.9 cm in front of the lens. How far is the image located from the lens
What is instantaneous acceleration
What is volume concentration
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