An airplane flies 21 km in 30 minutes. What is its average speed in kilometers per hour?

Extremely high temperatures and pressures are necessary for fusion reactions to take place in stars. true or false.

A wave has a wavelength of 8 mm and frequency of 3hertz. what is its speed?

A mass m1 is hung from a spring oscillates on a spring with spring constant k1. The amplitude of its motion is A1 and it has a maximum magnitude acceleration a1.

What step precedes the onset of hydrogen fusion in a star?

How can parts of a solution be separated by chromatography? O A. The solution is turned into a vapor. O B. The solution is collected as it is boiled off. O c. The solution is allowed to separate into layers. O D.

An 18000 kg freight car rests against a spring bumper at the end of a railroad track. The spring has constant k=3.2*10^5 N/m. The car is hit by a second car of 9400 kg mass moving at 8.0 m/s, and the two couple together.

What is a Nuclei of uranium atoms split apart

The velocity a rocket must reach to establish an orbit around Earth is called a. thrust velocity. c. artificial velocity. b. orbital velocity. d. escape velocity.

What is striking a match an example of? A) providing activation energy to a physical reaction B) providing activation energy to a chemical reaction C) an endothermic reaction D) an endothermic process

From Energy Graphs (LOLs) Again: Scenario 4 Hitting a Golf Ball Mass of the golf ball is 0.045 kg and has a forward velocity of 41 m/s due to the hit by the club. 9. What is the kinetic energy of the ball after being hit when its speed is 42 m/s? 10.