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Question: A semicircle of radius a is in the first and second quadrants, with the center of curvature at the origin. Positive charge +Q is distributed uniformly around the left half of the semicircle, and negative charge ?Q is distributed uniformly around the right half of the semicircle in the following figure. What is the magnitude of the net electric field at the origin produced by this distribution of charge? Please express your answer in terms of variables Q, a, constant (pi), and electric constant? (subscript 0)
you place a small lightbulb 70 cm from a concave mirror and find a real image 17 cm from the mirror. where should you
Sally expends 11 400 J of energy to drag a wooden crate 25.0 m across a floor with a constant speed. The rope makes an angle of 48.0° with the horizontal. How much force does the the rope exert on the crate?
A point particle travels in a straight line at constant speed, and the closest distance it comes to the origin of coordinates is a distance L. By respect to this origin, does the particle have a nonzero angular momentum? As the particle moves along i..
a one pound weight is released 3 feet off the ground. at the same time a two pound weight is released 5 feet off the
The piston can be considered frictionless. The leakage stops at t=1000s. The whole process can be considered to take place quasistatically with local equilibrium being achieved instantly within the cylinder.The pressure and temperature of the gas..
two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring-loaded gun that is mounted on a table. How far should Rhoda compress the spring to score a direct hit
Car A (with a mass of 2500 kg) collides with Car B (with a mass of 1500 kg) on wet asphalt. Car A skidded 50 m before the collision. Car B
A particle has a charge of 600 o C and a mass of 0.6 nkg. This particle is placed in a uniform electric field of 1,200 N/C. Find the a) electrostatic force acting on the mass. If the particle is free from rest what is its acceleration.
What is the pressure change in water going from a 3.2- cm-diameter pipe to a 2.3- cm-diameter pipe if the velocity in the smaller pipe is 4.0 m/s
A 1000 kg car is pushed up a 17.5 degree incline, for a distance of300 m at a constant speed. assume the applied force is directedparallel to the plane. how much work does this force do if theplane is frictionless? has a coeffiecient of friction of 0..
A 72.3-kg man is at rest on ice skates. A 0.178-kg ball is thrown to him. How fast is the man moving just after he catches the ball
microwaves of wavelength 5.0 cm enter a long narrow window in a building.. if the window is 35.0 cm wide what is the
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