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A massless horizontal strut is attached to the wall at the hinge O. What is the force that the hinge pin applies to the strut if the weight of the cables is also neglected?
An electron with a speed of 7.50 x 108 cm/s enters an electric field of magnitude 1.00 x 103 N/C, How much time will have elapsed
How many photons are emitted during 7.0 s of operation of a red laser pointer? The device outputs 2.5 Watts at a 635 nm wavelength
The sound intensity of a whisper is 1.0x10^-10 W/m^2 at one meter distance from the source. At what distance does the intensity level drop by an additional 1dB
a proton has a speed 4.5*10^5 m/s at a point where electrical potential is 900V. it moves through a point where the electric potential is 500V. find the kenetic energy of proton at first point
If the circular surface of the upper end of the rod is maintained at 290 K, what is the approximate boil-off rate of liquid helium after the lower half has reached 4.20 K
(Rev 2/11)In a 60 Hz circuit (such as house wiring), the voltage varies from a maximum value to a minimum, and back again 60 times per second. How is the average voltage defined
Aingly-ionized lithium has a nucleus of charge +3e and two electrons. Use the variational principle to estimate the ground-state energy. Now consider a nucleus of charge Ze with two electrons. Use the variational principle to estimate the ground-st..
A 2.5-mC charge is on the y-axis at y=3.0 m and a 6.3-mC charge is on the x-axis at x=3.0 m. What is the direction of the electric potential at the origin
A large wooden turntable in the shape of a flat disk has aradius of 2.00m and a total mass of 120kg. Find the angular speed of the turntable after the parachutist lands
What magnitude of charge must be given to the drop
a ceramic coffee cup with m0.113 kg and ccup1090 jkg.degk is initially at room temperature 24degc. if 225 g of 80.3degc
You have a concave spherical mirror with radius of curvature equal to 50 cm. Where do you have to place an object so that its image wouldbe real and twice the size of the object? Will the image be upright orinverted?
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