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In Fig. 23-45, a small, nonconducting ball of mass m =1.4 mg and charge q = 2.9 x 10-8 C (distributeduniformly through its volume) hangs from an insulating thread thatmakes an angle θ = 44° with a vertical, uniformly chargednonconducting sheet (shown in cross section). Considering thegravitational force on the ball and assuming the sheet extends farvertically and into and out of the page, calculate the surfacecharge density σ of the sheet.
Grace is playing with her dolls and decides to give them a ride on a merry-go-round. If the doll is13cm from the center of the spinning turntable platform, how fast (in m/s) is the doll moving
Even as exploring a sunken ocean liner, principal researcher found the absolute pressure on the robot observation submarine at the level of the ship to be about 413 atmospheres. The density of seawater is 1025kg/m^3.
Bill measures the rate at which the clock in sam's spaceship runs and finds that it is 1/3 the rate at which the same clock runs when it is at rest
Someone at a fifth-floor window (20 m above the ground) hurls a ball downward at 40.0° at a speed of 14.0 m/s. How long does the ball take to reach the sidewalk
100 g of a certain radioactive sample are sealed into a container. after 10 years, only 25 g remain. what is the half life of the sample
A bullet of mass 11.1 g is fired into an initially stationary block and comes to rest in the block. How much kinetic energy is lost
What is the total force and the absolute pressure on the bottom of a swimming pool 22m by 8.5 m whose uniform depth is 2 m
A converging lens is placed 20.0 cm to the right of a diverging lens of focal length 5.0 cm. Calculate the focal length of the converging lens
What is the half-life in days of a radioactive sample with 5.2×1015 atoms and an activity of 5.1×108Bq ? What is the half life in days
A 1000 kg airplane touches down on an icy runway, heading northward at 110 km/h. Find the speed and direction of the combined wreckage
A garden hose with an internal diameter of 2.0 cm is connected to a (stationary) lawn sprinkler that consists merely of an enclosure with 30 holes, at what speed does it leave the sprinkler holes
We can approximate an electron moving in a nanowire as a one-dimensional in?nite square-well potential. What are the three lowest energy levels of the electrons
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