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

What is the difference between speed and velocity? A. velocity describes speed with direction. B. velocity describes direction with position. C. velocity is used in space; speed is used on earth D. there is no difference.

Is energy absorbed or given off when an electron and a hole of a semi-conductor crystal recombine? What are the forms of energy that can be absorbed or given off?

A 5kg wheel rolls off a flat roof of a 50 m tall building at 12m/s. a. how long does it take the wheel to reach the ground? b. How far from the base of the building does it hit?

Which two tools below would be the most useful in testing how the mass of an object can affect the distance it moves after being pushed

Kendall has empty graduated cylinder with markings and an identical graduated cylinder partway filled with water. She also has a balance and a marble. Which statement best describes what Kendall can do? A.

2. With regard to the pH scale, a solution with a pH A. higher than 7 is considered an acid. B. lower than 7 is considered basic. C. of 6 is considered neutral. D. close to 14 is considered a strong base.

If a car rolls gently off a vertical cliff, how long does it take to reach 90km/hr.

In the game of volleyball, what skill relates to Newton's second law

The minimum breaking distance d in feet for a typical vehicle can be modeled with the equation d (v) = 0.045v2, where v is the vehicle's speed in miles per hour.