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When yellow light from a sodium lamp shines on a certain photocell, a negative potential of 0.3 V is needed to stop all the electrons from reaching the collector. What potential would be needed to stop the electrons if light with 4000 A is used?
The two hot-air balloons in the drawing are 48.2m and 61.0 m above the ground, What is the horizontal distance x between the two balloons
A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 1.2 cm, and the toy is released. If the spring constant is 103 N/m, what is the magnitude of the spring force acting on the..
A superhero flies 147 m from the top of a tall building at the angle of 33 degrees below the horizontal. What is the vertical component of the superhero's displacement.
Approximately how many atoms make up our planet? For simplicity, suppose the average atomic mass of the atoms is 14 . Avogadro's number gives the number of atoms in a mole.
Two thin, isolated, concentric conducting spheres of radii 5.10 cm and 14.40 cm, have net charges of 23.00 nC, What is the electric potential at 3.315 cm from the center of the spheres
Consider three capacitors having capacitances of 5.51, Find their equivalent capacitance if they are connected for both: in parallel and in series
A charge of 3.80 10-6 C is placed on a small conducting sphere that is located at the end of thin insulating rod whose length is 0.22 m. The rod rotates with an angular speed of ω = 156 rad/s about an axis that passes perpendicularly through its o..
What is the magnitude of vertical component of its velocity as it strikes the ground.
You are driving to grocery store at 21. You are 100 from an intersection when the traffic light turns red. Presume that your reaction time is 0.75 and that your car brakes with constant acceleration. How far from the intersection are you when you ..
Four particles with masses 4 kg, 2 kg, 4 kg, and 2 kg are associated by rigid rods of negligible mass. The origin is centered on the mass in the lower left corner, and all the particles are located in Quadrant 1. The rectangle is 5 m wide and 4 m ..
A lead ball is dropped into a lake from a diving board 5 above the water. After entering the water, it sinks to the bottom with the constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.20 after it is f..
Two in-phase loudspeakers are located at (x, y) coordinates (-2.5 m, +2.0 m) and (-2.5 m, -2.0 m), Determine the amplitude of the sound at the five positions on the y-axis (x = 0) with y = 0.0 m, 0.5 m, 1.5 m, and 2.0 m
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