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The Earth's radius is 6370 km . There is a downward-pointing electric field in the atmosphere above the Earth's surface, of average magnitude 105 N/C .
a) What is the flux of the electric field out of the Earth?
b) What is the charge on the Earth?
A bead with a mass of 0.050g and a charge of 20nC is free to slide on a vertical rod. At the base of the rod is a fixed 10nC charge. In equilibrium, at what height above the fixed charge does the bead rest?
A 186 watt motor is used to lift a 114kg container to a height of 6m. How much time does it take to lift the container with the motor.
A certain cable car in San Francisco can stop in 10s while travelling at maximum speed. On one occasion, driver sees a dog a distance d m in front of the car and slams on the brakes instantly.
How much work (in joules) is done in moving a charge of 2*10^-6 electrons from positive terminal of the battery to the negative terminal of a 12-Volt battery.
Iif the collision is perfectly elastic, what is the ball's speed immediately after the collision? Illustrate what is the maximum compression of the spring?
Illustrate what gravitational force do the two protons in the helium nucleus exert on each other? Their separation is approximately 1.0 fm
A couple is defined as two parallel forces, separated by a distance, that have equal magnitudes but opposite directions. A couple only produces a rotation in a specified direction. The moment produced by a couple is known as a couple moment.
In a region where there is an electric field, the electric forces do +8.00x 10^-19 J of work on an electron as it moves from point X to point Y.What is the potential difference, VY - VX, between point Y and point X?
What is the gas pressure? Give your answer in atm. The gas then undergoes an isothermal compression until the pressure is 3.1atm, What is the final temperature of the gas
A group of hikers hears an echo 3 s after shouting. If temperature is 16°C, how far away is the mountain that reflected sound wave.
Which best describes the total mechanical energy of a system in simple harmonic motion? A. zero as it passes the equilibrium point B. zero when it reaches the maximum displacement C. a maximum when it passes through the equilibrium point D. consta..
Assuming biological substances are 98 percent water, estimate the masses of a cell with a diameter of 0.7 µm, a human kidney, and a fly. Take a kidney to be roughly a sphere with a radius of 5.0 cm and a fly to be roughly a cylinder 4.90 mm long a..
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