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A guy pushes a lawn mower on a level lawn with a force of 201 N. If 44% of this force is directed downward, how much power does he disburse in pushing the mower 6.5 m in 17 s?
A light bulb operates at 2.1 percent efficiency. The emitted light is 555 nm, find the number of photons per second given off
A saturated solution of strontium hydroxide is prepared in the excess solid Sr(OH)2 is allowed to settle. A 25.0mL aliquot of the saturated solution is withdrawn and transfer to an Erlenmeyer flask
The intensity on the screen at a certain point in a double slit interference pattern is 64.0% of the maximum value. What minimum phase difference (in radians) among sources produces this result?
Explain the difference between a fluorescence emission spectrum and a fluorescence excitation spectrum, What is the force constant for the CO bond
A wave on a string is described by the relation y =A sin(36t - 0.042x), where t is measured in seconds and x in meters, with A = 0.16 m. Estimate what is the speed of the wave
Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. What is the focal length of the mirror
A 3.4cm diameter parallel-plate capacitor has a 2.5mm spacing. The electric field strength inside the capacitor is 1.5×10^5 V/m, how much is the charge on each plate
Suppose that the spin magnetic quantum number ms had three possible values, rather than two. how many electrons would it take to fill the K shell
An empty parallel plate capacitor is charged with the charge Q= 5uC (One plate of the capacitor carries the carge +Q and the other carries the -Q). Find the capacitance of the capacitor
In the figure below, sources A and B emit long-range radio waves of wavelength λ =430 m, by the phase of the emission from A ahead of that from source B by 90°. The distance r A from A to detector D is greater than the corresponding distance B with 1..
A diver can change his rotational inertia by drawing his arms andl egs close to his body in the tuck position. After he leaves the diving board in the straight position (with some unknown angularvelocity), he pulls himself into a ball as closely a..
Ray decides to paint the outside of his uncle's house. He uses a 4.0-m-long board supported by cables at each end to paint the second floor. find the force that the right cable exerts on the board
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