How do elements change as you move down a column in a periodic table? a. the atomic radius decreases b. the number of protons decreases c. the atomic mass decreases d. the electronegativity decreases

Which of the following types of electromagnetic radiation has the longest wavelength? choose one answer. a. ultraviolet rays b. red light c. gamma rays

An 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: the force of wagon 1 on wagon 2?

If someone wants to see around 90 * corner, at what angel would they have to place a mirror

If the skater coasts only around 65 degrees of the circle, find the magnitude of his displacement vector.

In the diagram, the arrow shows the movement of electric charges through a wire connected to a battery.

a 2 kg rock is dropped from the top of a 30 m High building calculate the ball at the time that it strikes the ground

Water, with a density of rho = 1145 kg/m 3, flows in a horizontal pipe. In one segment of the pipe, the flow speed is v 1 = 7.33 m/s. In a second segment, the flow speed is v 2 = 1.57 m/s.

What does the color of a star determine

Scientific cosmology Choose one: A. investigates the overall structure and history of the Universe. B. pertains to legends and verbal history about the beginnings of the Universe. C. proves the Big Bang theory. D.

Which statement best describes longitudinal waves? A) Particles of the wave medium move perpendicular to the direction of propagation of the wave. B) Longitudinal waves do not require a material medium for propagation.