Two small spheres spaced 20.0 cm apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10-21 N?

A. 562

B. 9.14 * 10^3

C. 1.01 * 10^6

D. 891

When you go out to your car one cold winter morning you discover a 0.70-cm thick layer of ice on the windshield, which has an area of 1.0 m2. If the temperature of the ice is - 4.

two ice skaters push each other, and move in opposite directions. the mass of one is 75 kg, and his speed is 2 m/s. if the mass of the other is 30 kg, what is her speed?

Which describes a scenario in which the Doppler affect is occurring The volume increases The pitch changes from low to high The pitch changes from high to low The volume decreases

Unless otherwise authorized, the maximum indicated airspeed at which aircraft may be flown when at or below 2,500 feet AGL and within 4 nautical miles of the primary airport of Class C airspace is

calculate the force exerted on a rocket given that the propelling gases are expelled at a rate of 1500 kg/s with a speed of 4.0x10^4 (at the moment of take off)

An experiment was conducted to determine the effect of alcohol on driving. Subjects consumed varying amounts of alcohol. Then they drove around barrels. Judges rated their performances. The independent variable in the experiment was the

What would you be most likely to find if you returned to the solar system in 10 billion years?

Opposite chargers and like charges

A distance - time graph indicates that an object moves 100 m in 4 s and then remains at rest for 6s what is the average speed of the object

A scientist is conducting research to determine how much pressure a dam can withstand. Why are good observations important to his research?