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Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.57 g and a charge of magnitude q. The balls are attracted to each other, and the threads attached to the balls make an angle of 20.0° with the vertical, as shown in the figure below. Find the magnitude of the electric force acting on the ball? Find the magnitude of the charge on the balls?
Solve the Friedmann equation to get the scale factor as a function of time.
The magnetic field perpendicular to a circular wire loop 11.2cm in diameter is changed from +0.50Tto -0.33T in 130ms, In what direction does the induced current flow?
A large fraction of the ultraviolet (UV) radiation coming from the sun is absorbed by the atmosphere. The main UV absorber in our atmosphere is ozone, O 3 rm O_3. In particular, ozone absorbs radiation with frequencies around 9.38×1014Hz rm Hz..
What focal length does the lens require
A van de Graaff generator consists of a conducting sphere of radius 20 cm supported on a long insulating tube. What is the electric field at the surface of the sphere
A viewing window on the side of a large tank at a public aquarium measures 42 in. by 52 in. What is the total outward force on the window
Consider two strings on a violin. They are the same length and have the same tension. What is the mass density of the second string
Unpolarized light passes through two polarizers in turn with polarization axes at 41° to one another. What is the fraction of the incident light
Force F = (-9.0 N) i + (5.0 N) j acts on a particle with position vector r = (-5.0 m) j + (1.0 m) k. What is the torque on the particle about the origin
Two rockets are approaching each other on a head on collision course each is moving at velocity 0.8 relative to an independent observer midway between the two with what velocity does on rocket observe the approach of the other
Some sliding rocks approach the base of a hill with a speed of 18.0m/s. Find the acceleration of the rocks as they slide up the hill
The 1.5 kg balls are attached to the ends of a thin rod of length 42.0 cm and negligible mass. Through what angle will the system rotate before it momentarily stops
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