Which speed is at the sound barrier?

5 m/s

257 m/s

3.0 x 10⁸ m/s

343 m/s

Which of the following occur around powerful magnetic fields within the sun? Auroras Charged particles Eclipse Solar flares

One property that electromagnetic waves differ from other types of waves is that they can a.) move particles in a medium b.) travel in a vacuum c.) transfer energy d.) create a disturbance Wouldn't it be B, travel in a vacuum.

How can two machines appear identical and yet not have the same actual mechanical advantage

Why do moving back and forth, and moving in a circle look the same on a graph of position versus time?

A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?

The work of Charles Kuen Kao is likely to have been most influenced by the work of which of the following scientists? A. Galileo Galilei B. Christian Doppler C. Sir Isaac Newton D. Ibn al-Haytham

Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car acceleration?

Why can crevasses in glaciers only be 50 meters deep? A. Plastic flow occurs below that depth. B. Glaciers cannot be thicker that 50 Meters. C. Surges prevent plastic flow below that depth. D. Basal slip occurs below that depth.

What are the changes to Earth's surface that occur as a result of plate movement

Two spaceships are approaching each other. (a) If the speed of each is 0.9c relative to Earth, what is the speed of one relative to the other?