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An arch of 120 degrees carries a total charge of Q. The radius of the arch is R (ignore the thickness of the wire). What is the magnitude of the electric field at the center? The "center" is the same point as if it were the center of the complete circle.
A 1.20 kg ball and a 4.00 kg ball are connected by a 74.0 cm long massless, rigid rod. What is the rotational kinetic energy of the structure
A 30.0N force is being applied to one end of a 60.0cm long rigid bar at an angle of 30 degrees. Calculate the torque being applied to the shaft
on planet tehar the free-fall acceleration is the same as that on earth but there is also a strong downward electric
You are assigned the design of a cylindrical, pressurized water tank for a future colony on Mars, Find the net downward force on the tank's flat bottom, of area 2.45m2 , exerted by the water and air inside the tank and the air outside the tank
A rock of mass 44 kg accidentally breaks loose from edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. What is the magnitude of the acceleration of the rock?
two wires on a piano are the same length and are stretched to the same tension. wire 1 vibrates at a frequency 1.5
In 9.7 s a fisherman winds 2.8 m of fishing line onto a reel whose radius is 3.0 cm, Determine the angular speed of the reel
A converging lens with a focal length of 13.7 cm and a diverging lens are placed 24.0 cm apart, with the converging lens on the left. What is the height of the final image
A 28.0 g object moving to the right at 18.0 cm/s overtakes and collides elastically with a 9.0 g object moving in the same direction at 15.0 cm/s. Find the velocity of each object after the collision
A force FT is applied to a cord wrapped around a pulley with moment of inertia I = 0.295 kg · m2 and radius R0 = 33.0 cm, what is the linear speed of a point on its rim 7.0 s later
An electron enters a region of space containing a uniform 0.0000227-T magnetic field. Its speed is 115 m/s, Find the radius r of the electron\'s path, and the frequency f of the motion
your eye diameter 2.5 cm is able to focus the image of a tree on your retina. the tree is 24 m tall and 85 m away. what
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