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A long uniform board weighs 54.9 N (11.0 lbs) rests on a support at its mid point. Two children weighing 419.0 N (83.8 lbs) and 209.0 N (41.8 lbs) stand on the board so that the board is balanced. What is the upward force exerted on the board by the support?
A cylinder weighs 2.3N in the air and has dimensions of d = 2.8 cm, and height= 14cm. What is the density of the object?
A 31.0cm focal length converging lens is 24.0 cm behind adiverging lens. Parallel light strikes the diverging lens. What is the focal length of the diverging lens
A Styrofoam slab has thickness h and density ?s . When a swimmer of mass m is resting on it, Find the area of the slab
A proton has a speed of 0.80c.Calculate the rest energy of the proton. Calculate the total energy of the proton
What is the ratio of the cardinals magnitude. One mole of tungsten (6 1023 atoms) has a mass of 184 grams, and its density is 19.3 grams per cubic centimeter. You have a long thin bar of tungsten, 2.3 m long, with a square cross section, 0.15 cm on..
An observer, whose eyes are 1.81 m above the ground, is standing 31.8 m away from a tree. The ground is level, and the tree is growing perpendicular to it. How tall is the tree
A stone is thrown vertically upward with a sped of 12.0 m/s from the edge of a cliff 70.0 M high. How much later does it reach the bottom of the cliff
A battery of internal resistance r = 0.2 and emf E = 12.0 V. If the battery is connected to a device of resistance 6.0 (ohms), What is the electric power output of the battery
A mass m = 4.4 kilogram is attached to a vertical spring with k = 220N/m and is set into motion. find what is the maximum value of the velocity
A machinist turns the power on to a grinding wheel, at rest, at time t = 0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 83 rad/s. The wheel is run at that angular velocity for 29 s and then power is shu..
The highest part of a road over the top of a hill follows an arc of a vertical circle of radius 50.0 m. With what minimum speed must you drive
An extreme skier, starting from rest, coasts down a mountain that makes an angle 25.0° with the horizontal. How fast is she going just before she lands
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