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Consider a point charge with a charge Q, located at the origin, in an empty space. Let the electric potential be zero at infinity. Suppose that at a distance r from this charge, the magnitude of the electric potential and electric field are 74 V and 38 V/m, respectively. How many coulombs of charge, Q, are at the origin?
A 100 W lightbulb produces 4.0 W of visible light. What is the light intensity on a wall 3.0 m away from the lightbulb
A cylindrical conductor has resistance of R0 = 200 ? (ohms). what's the value of the new resistance in ohms
A cube of wood having an edge dimension of 20.0 cm and a density of 650 kg/m3 floats on water. What is the distance from the horizontal top surface of the cube to the water level
A square with sides of length L has a point charge at each of its four corners. Find the magnitude and sign of the charges Q such that each of the +1.00 µC charges experiences zero net force
A model-train transformer plugs into 120-V ac, What voltage is present across the tracks
a rocket starts from rest and moves upward from the surface of the earth. for the first 10s of its motion the vertical
When yellow sodium light, ?=589nm, falls on a diffraction grating, its first-order peak on a screen 55.0cm away falls 3.29cm from the central peak. What is the wavelength of the new source
A car starts from rest at a stop sign. It accelerates at 3.7 m/s^2 for 6.8s , coasts for 2.4s , How far apart are the stop signs
A rod flies with constant velocity past a mark which is stationary in the K frame. In the K frame, it takes the rod Deltat = 20 ns to fly pass the mark. In the K' frame fixed to the rod, the mark moves past the rod in Deltat' = 25 ns. Find (a) the ve..
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0618 s, during which time it experiences an acceleration of 326 m/s2. The ball is launched at an angle of 57.3° above the ground. Determine..
A thin rod consists of two parts joined together. One third of it is silver and two-thirds is gold. The temperature decreases by 24C°.
A 3 kg block slides along a frictionless surface at 1.0 m/s. A second block, sliding at a faster 5.0 m/s, What is the mass of the second block
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