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A brick weighing 30 N falls from a height of 15 m and sinks 0.7 m into the ground. What is the average force on the rock due to the ground as it sinks into the ground?
Water flows out of a large open reservoir through a small pipe that opens to the atmosphere 30 m below the level of the water in the reservoir.
The acceleration as a function of time of a mass-spring system is given by a=(0.70m/s^2)sin[(3rad/s)t]. a)If the spring constant is 20N/m, what is the amplitude? b)What is the initial velocity? c)what is the mass of object?
two long parallel wires separated by 50 cm both carry currents of 4.0 A in the same vertically up direction. Find the magnetic field midway between the wires
A diffraction grating with 610 lines per mm is illuminated with light of wavelength 520nm . A very wide viewing screen is 2.1m behind the grating. How many bright fringes can be seen on the screen
A garden hose with an internal diameter of 2.0 cm is connected to a (stationary) lawn sprinkler that consists merely of an enclosure with 30 holes, at what speed does it leave the sprinkler holes
Two children are carrying a 2.00-m long uniform level board with a mass 5.00 kg, What is the force applied by the child that is closer to the book to support the board
A rock of mass m = 2 kg is tied to a string of length L = 1.9 m and is twirled in a vertical circle. The speed v of the rock is constant; that is, it is the same at the top and the bottom of circle.
At a certain point P and at a given instant, the elctric field of the wave is give by E = (0.082 V/m)j. What is the Poynting vector at the point P at that instant
an ideal transformer steps down 120 volts to 12.0 volts and the 2630- turn secondary supplies 12.0 amperes. What is the ratio output power to input power
A diverging lens (f = -12 cm) is located 20.0 cm to the left of a converging lens (f = 35.0 cm). find the distance of the final image relative to the converging lens
Earth has a net charge that produces an electric field of approximately 150 N/C downward at its surface. (a) What is the magnitude and sign of the excess charge, noting the electric field of a conducting sphere is equivalent to a point charge at i..
A certain orthodontist uses a wire brace to align a patient's crooked tooth as in the figure below, Find the magnitude of the net force exerted by the wire on the crooked tooth
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