What is an apparent change in the frequency of sound or light waves known as?

The orbit of mars is never far from the ecliptic. why?

What are jet streams and where do they occur?

The atomic number of carbon is 6. How many electrons does an ion of carbon have if it is represented by the symbol shown below? 12C1-

A guitar string 66 cm long vibrates with a standing wave that has two antinodes. 1. Which harmonic is this 2. what is the wavelength

Which is an example of weather? A. The temperature and wind speed in Philadelphia today B. The increase in temperature over north america over the past decade C. The time for high tide in Daytona beach today D.

The universe is believed to have been form from a very dense fireball billions of years ago.

What does the slope of the line on this velocity versus time graph represent? A. positive deceleration B. zero acceleration C. positive acceleration D. negative acceleration

Which of the following objects has the greatest kinetic energy? a baseball flying through the air at 90 miles per hour a baseball flying through the air at 45 miles per hour a baseball flying through the air at 20 miles per hour a baseball sitting

Peter found an amazing fact in an amusement park when he tried to ride the Magic Mountain Superman. Powerful magnets accelerate a car and its riders from zero to 45 m/s in 7 seconds. Suppose the mass of the car and riders is 5,600 kg.

The formula s = 16t2 gives the distance an object falls due to gravity, where s is the distance in feet and t is the time in seconds. how many feet will the object fall in 6 seconds?