Which fossil fuel creates the least amount of pollution when it's burned?

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 * 10-21 n?

What type of experiment involves changing only one variable at a time

A jet airplane is in level flight. The mass of the airplane is m = 8970 kg. m=8970 kg. The airplane travels at a constant speed around a circular path of radius R = 8.45 mi R=8.45 mi and makes one revolution every T = 0.112 h. T=0.112 h.

A 30-kg chandelier hangs from a ceiling on a vertical 4.4-m-long wire. what horizontal force would be necessary to displace its position 0.16 m to one side?

Which one of the following distances is the shortest? a. 0.1 m b. 1 cm c. 0.001 km d. 100 mm?

What will happen if I put my hand in a space vacuum.

You are exploring a distant planet. When your spaceship is in a circular orbit at a distance of 630 km above the planet's surface, the ship's orbital speed is 4900 m/s. By observing the planet, you determine its radius to be 4.48*106m.

What happens when an electric current passes through a wire?

A small car of mass m and a large car of mass 4m drive along a highway at constant speed. they approach a curve of radius r. both cars maintain the same acceleration a as they travel around the curve.

Two physics professors challenge each other to a 100 m race across a football field. The loser will grade the winner's lab reports for a month. Dr. Nelson runs the race is 10.40s. Dr. Bay runs the first 25.0 m with an average speed of 10.