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Three identical stars of mass M = 3.1x1030 kgform an equilateral triangle that rotates around the triangle'scenter as the stars move in a common circle about that center. Thetriangle has edge length L = 8.3x1010 m. What is the speed of the stars?
q1. a bird lands on a bare copper wire carrying a current of 23 a. the wire is 8 gauges which means that its
A golfer practices driving balls off acliff and into the water below. how far does the ball travel horizontally before hittingthe water
You do 220 J of work pulling your sister back on a swing, whose chain is 5.00 m long, until the swing makes an angle of 30.0 degrees with the vertical, What is your sisters mass
Calculate the number of electrons in a steel iron pinhead. The pinhead may be assumed to be spherical with a diameter 2mm
Two wires are identical, except that one is gold (resistivity = 2.44×10-8 ?·m) and the other is NiChrome (resistivity = 1.10×10-6 ?·m). What is the resistance of the NiChrome wire
The height of a helicopter above the ground is given by h = 3.35t3, where h is in meters and t is in seconds. How long after its release does the mailbag reach the ground
An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 14.9 N. compute the volume of the object
You measure distances from the center of a diffraction pattern (y) to a series of dark fringes on a screen, What is the wavelength of the laser you used to collect the data
A 6.90-g lead bullet traveling at 420 m/s is stopped by a large tree. what is the increase in temperature of the bullet
If a system in equilibrium with two masses m1 and m2 are placed at distances d1 and d2 from the fulcrum, then f1 d1= f2 d2. Is this the same as saying that m1 d1= m2 d2? Give details.
A 1 kg block of Al is heated at atmospheric pressure so that its temperature increases from 22.0 degrees C to 40.0 degrees C. calculate The work done by the Al block
a sealed tank containing seawater to a height of 10.0 also contains air above the water at a gauge pressure of 3.25 .
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