2. How much of the world's electricity currently comes from coal?

Select one:

a. 25%

b. 40%.

гоо оо.

с. 50%

d. 75%

A fairgrounds ride spins its occupants inside a flying saucer-shaped container. if the horizontal circular path the riders follow has a 5.

A radioactive element undergoes decay via the loss of two alpha particles to form a stable daughter isotope. Following the decay, what would the atomic number of this newly created stable isotope be?

Which is generated by movements of tectonic plates? a. seismic waves b. ocean currents c. volcanoes d. earth's magnetic field

The frequency of a wave is 10 Hz. If the speed of the wave is 5 m/s, what is the wavelength? A. 0.5 m B. 2 m C. 10 m D. 50 m

A 0.500 kg rock is whirled in a vertical circle of a radius 0.60 m. the velocity of the rock at the bottom of the swing is 4.0 m/s. what is the acceleration A 3.3 m/s^2 B 26.6 m/s^2 C 13.3 m/s^2 D 6.6 m/s^2

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.

A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two decimal places) ?

How Long will it take a plane flying north from Miami to reach New York City 1800 km away if the average velocity of the plane is 940 km/h

If vector A = 5.5N NE and vector B = 10m N 30° W, what is the vector product of A*B

Which is the best desciption of a molecule?