What do scientists study to figure out how long it takes the Sun to make one rotation on its axis?

A. flares

B. auroras

C. sunspots

D. prominences

Example of energy conversation that produces unwanted form of energy

True or False? Metrics are based on the British system of weights and measures.

Why does earth orbit the sun rather than any other body in the solar system? a) the mutual repulsions among all the planets hold earth in its orbit. b) the earth is closer to the sun than other bodies in the solar system.

Two organ pipes, both open at one end but closed at the other, are each 1.14 m long. One is now lengthened by 2 cm. Find the frequency of the beat they produce when playing together in their fundamental frequencies. A) 0.9 Hz B) 3.4 Hz C) 2.

An elevator is rising at constant speed. Consider the following statements: 1. the upward cable force is constant 2. the kinetic energy of the elevator is constant 3. the gravitational potential energy of the Earth-elevatorsystem is constant 4.

The magnitude of a velocity vector is called speed. suppose that a wind is blowing from the direction n45°w at a speed of 40 km/h. (this means that the direction from which the wind blows is 45° west of the northerly direction.

The y component of the electric field of an electromagnetic wave traveling in the + x direction through vacuum obeys the equation Ey = (375 N/C) cos[kx - (2.20 * 1014 rad/s) t]. What is the wavelength of this electromagnetic wave? (c = 3.

The work of Subrahmanyan Chandrasekhar is likely to have been most influenced by the work of which of the following scientists? A. Albert Einstein B. Edwin Hubble C. Marie Sklodowska-Curie D. Lord Kelvin

Explain why it's important that the alveoli is only 1 cell thick

A new cannon was being developed in a science lab. The instructor wanted to do some testing of the cannon's ability to launch objects with different masses. The instructor used tennis balls and filled them with lead, rocks, and styrofoam.