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A 1000 kg safe is held 2 m above a heavy duty spring when the rope holding it breaks. The safe compresses the spring 50 cm. What is the spring constant?
Suppose that in Sherwood Forest, the average radius of a tree is R= 1 m and the average number of trees per unit area is 0.005m^(−2). If Robin Hood shoots an arrow in a randomdirection, how far, on average, will it travel before itstrikes a tree?
A battery has an internal resistance of 0.75 ohm and an emf of 9 V. It is placed a cross a 5 ohm resistor and a 10 uF capacitor hooked up in parallel. a) after the capacitor has charged, what is the current through the resistor? b) what is the charge..
After a golf ball is hit it takes off with an initial speed of 26.2 m/s and at an angle of 39.5° with respect to the horizontal. The golf field is flat and horizontal.
What is the maximum value of the electric field in an electromagnetic wave whose average intensity is 3.75W/m^2 ?
A small ball is doing circular motion around a pole. The string connecting the pole and the ball is 30 degrees (?) away from the pole. Find the linear speed of the ball
A 70 kg painter holding a 15 kg paint is climbing up a 30 m-long ladder, which weighs 20 kg, against a frictionless wall at an angle of 60 degree. how far could the painter go up along the ladder
A piece of glass has a temperature of 80.6 ° C. Liquid that has a temperature of 43.0 ° C is poured over the glass, determine the specific heat capacity of the liquid
A net is positioned a horizontal distance of 52.0 m from the cannon. Explain at what height above the cannon should the net be placed in order to catch the daredevil?
a point charge q1 -5.00 nc is at the point x1 meters y2 meters. a point charge q210 nc is at the point x 2 meters y0.a
An object of mass m = 3.1 g and charge q = +48 μc is attached to a string and placed in a uniform electric field that is inclined at an angle of 30 degrees with the horizontal. The object is in static equilibrium when the string is horizontal.
A 2.1 ? 103-kg car starts from rest at the top of a 4.5-m-long driveway that is inclined at 15° with the horizontal. find the speed of the car at the bottom of the driveway
A ball of mass M and radius R starts from rest at a height of h = 1.73 m and rolls down a ? = 25.8° slope, What is the linear speed of the ball when it leaves the incline
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