A 63 kg object needs to be lifted 7 meters in a matter of 5 secound. Approximately how much horsepower is required to achieve in the task

A ball weighs 200n on earth is moved to a planet that has a mass four times larger and a diameter three times larger than that of earth. After the ball is moved what is its mass and weight?

If the net force acting on a sliding block is tripled, then its acceleration will? a. quadruple b. double c. triple d. remain the same

A sound whispered at one focus of a whispering gallery can be heard at the other focus. Two people are standing in a whispering gallery whose cross section is a semielliptical arch with a height of 28 feet and a width of 90 feet.

Multiple reverberations or reflections of sound can interfere with sound quality. True False

Which of the following is NOT true about a hypothesis? A. It is an explanation for an observation B. It must restate the question C. It is testable D. It can be written as an if/then statement

In an experiment, the control is never changed by the scientist not important to the scientist not recorded by the scientist changed by the scientist

When you catch a baseball, what kind of work do you do, negative or positive? by catching the ball, what do you change? what energy does it gain or lose?

All describe work except A) a team of dogs dragging a sled B) a jokey sitting on a horse C) a bowler lifting a bowling ball

Who is known as the father of toxicology

In which layer of the sun is energy transfferred between atoms?