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Two identical, small insulating balls are suspended by separate 0.23-m threads that are attached to a common point on the ceiling. Each ball has a mass of 6.9 × 10-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a result, spread apart with an angle of 50o between the threads. Determine
(a) the charge on each ball and
(b) the tension in the threads.
A 195 W (121 V) night light is turned on for an average 6.5 hr a day year round. What is the annual cost of electricity at a billing rate of $0.07 per kWh
A wire has a length of 7.60 multiply.gif 10-2 m and is used to make a circular coil of one turn. find the maximum torque that this coil can experience
the time constant of an RL circuit with L=25mH is six times larger than the time constant of an RC circuit with C=55uF. Both circuits have the same resistance R. What is the time constant of the RC circuit?
A coil with 41 turns of wire is wrapped on a frame with a square cross-section 1.85 cm on a side. Find the magnitude of the induced current in the coil while the field is changing
A gymnast of mass 59 hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and presume that the rope does not stretch. Utilize the value for the acceleration of gravity.
A 253 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp and the log has an acceleration of 0.700 m/s2, Find the tension in the rope
A baseball outfielder throws a 0.150 kg baseball at a speed of 35.0 m/s and an initial angle of 26.0°. Illustrate what is the kinetic energy of the baseball at the highest point of its trajectory?
A 743 pF capacitor is charged to 130 V and then quickly connected across a 172 mH inductor.What is the resulting frequency of oscillation
If John Glenn weighed 640 N on the Earth's surface, i) how much would be having weighed if his Mercury spacecraft had (hypothetically) remained at twice the distance from the center of the earth? ii) Why is it said that an astronaut is never truly..
An airplane can be made invisible to radar by coating the plane with a thin layer of an antireflective material. How many dark fringes are observed when 600 nm light illuminates the slides from directly above
A man whose mass is 80kg on the earth's surface is in a spacecraft at a height of 2 Earth radii above the earth's surface. At that height what is the acceleration due to gravity
A current of 6.71 A in a solenoid of length 11.0 cm creates a 0.339-T magnetic field at the center of the solenoid. How many turns does this solenoid contain
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