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A 2-g ping-pong ball rubbed against a wool jacket acquires a net positive charge of 1É C. Estimate the fraction of the ball’s electrons that have been removed. Suppose that the ball has 1 gram of neutrons, 1 gram of protons, and as many electrons as protons.
an incident wave d2.0 cm sin 4.5x-18t where x and t are in meters and seconds travels down a cord from a section with
A long straight wire suspended in the air carries a conventional current of 8.2 amperes in the ?x direction, What is the (vector) magnetic field due to the wire at the location of the electron
It takes 25 turns to drive a screw completely into a block of wood. Because the friction force between the wood and the screw is proportional to the contact area between the wood, what is the total work (in J) required to drive in the screw
A steel cable with total length 20 m and mass 100 kg is connected to two poles. The tension in the cable is 2,000 N, and the wind makes the cable vibrate with a frequency of 2 Hz. compute the wavelength of the resulting wave on the cable.
The critical angle for total internal reflection at a liquid-air interface is 45.0^\circ. what angle does the refracted ray in the air make with the normal
A 10000 car comes to a bridge during a storm and finds the bridge washed out. The 650 driver must get to the other side, so he decides to try leaping it with his car. What is the speed of the car just before it lands safely on the other side
Regarding the Earth and a cloud layer 750 m above the Earth as the "plates" of a capacitor, calculate the capacitance. Assume the cloud layer has an area of 1 km2 and that the air between cloud and ground is pure and dry.
A beam of parallel rays from a 24 MHz citizens band radio transmitter passes between two electrically conducting (hence opaque to radio waves) buildings located 45.00 m apart. What is an angular width of the beam as it emerges from between the buildi..
Suppose that you loft the ball with an initial speed of v = 16.2 m/s, at an angle of ? = 49.4° above the horizontal. With what minimum average speed must he move
A 4000.0 kg spaceship is traveling toward the moon at a velocity of 20.000 km/s. At the rear of the spaceship, What is the spaceship velocity after the rocket fires
A device used in radiation therapy for cancer contains 1.40 g of cobalt 2760Co (59.9333819 u). Determine the activity of the radioactive material
A block of mass m=1.40 kg oscillates in simple harmonic motion due to the force of the spring to which the block is attached to. Express the displacement of the spring in terms of A when v= vm/2 and find its value
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