Is the burning of a match an exothermic reaction?


Yes.

Physics & Space Science

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A racquetball is dropped from a height of one meter. It bounces off the floor and rises to a height of 0.8 m. The collision with the floor was

A. an elastic collision. B. a perfectly inelastic collision. C. a partially inelastic collision. D. impossible to tell without knowing the mass of the ball.

Physics & Space Science

Compared to the star it evolved from, a white dwarf is

A) hotter and brighter. B) hotter and dimmer. C) cooler and brighter. D) cooler and dimmer. E) the same temperature and brightness.

Physics & Space Science

In principle, if we could see all the way to the cosmological horizon we could see the Big Bang taking place. However, our view is blocked for times prior to about 380,000 years after the Big Bang. Why?

A) Before that time, the universe was too crowded with stars. B) Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely. C) Before that time, the universe was dark so there was no light to illuminate anything. D) 380,000 years after the Big Bang marks the time when stars were first born, and thus began to shine the light by which we can see the universe.

Physics & Space Science

A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest?

a. the hoop b. the sphere c. the cylinder d. All go the same distance.

Physics & Space Science