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In the figure, a constant external force P = 160 N is applied to a 20.0-kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. What ia the work done by friction during this process?
A cannon fires a a pumpkin at 65 degree angle with an inital velocity of 15 m/s. How far has the pumpkin travelled horizontally
Coherent light that contains two wavelengths, 660nm and 470nm , What is the distance on the screen between the first-order bright fringe for each wavelength
One kilogram of dry air at STP conditions is exposed to 1.00 R of X-rays. One roentgen is defined by Equation 32.1 in Section 32.1. An equivalent definition can be based on the fact that an exposure of one roentgen deposits 8.30 x 10-3 J of energy..
The gap between the plates of a parallel plate capacitor is 6.9 mm. When the plates are charged with a 7.0 V battery, What is the magnitude of the electric field between the plates
Andy and Brad are lifting a 100 kg box to their apartment window using massless ropes. The ropes are tied to the same point on the box, Find the tensions in each rope.
An emf is induced in a conducting loop of wire1.30 {\rm m}long as its shape is changed from square to circular. Find the average magnitude of the induced emfif the change in shape occurs in 4.37 {\rm s}and the local 0.127-{\rm T}magnetic field is ..
Find the frequency and the tension in the thinner string if it is to produce a note which is 3 octaves above the fundamental note of the thicker string.
A beam of nuclei is used for cancer therapy. Each nucleus has an energy of 181 MeV, How many nuclei are in the beam
Two masses of 4 kg and 3 kg are connected atthe two ends of light inextensible string that passes overa frictionless pulley. Find the acceleration of the masses and the tension in the string, when the masses are released.
a bat emits a sound whose frequency is 82.2 khz. the speed of sound in air at 20.0 oc is 343 ms. however the air
How much charge can be placed on a capacitorwith air between the plates before it breaks down, if the area ofeach of the plates is 6.00cm2? Find the maximum charge if bakelite isused between the plates instead of air.
a fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. the
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