If one object has a positive charge and another has a negative charge, the object will be ...

A. Cancel

B. Attract

C. Mix

D. Repel

Lead-214 has a half-life of 43.5 seconds. What percent of a sample of this isotope would be left after a time equivalent to 7 half-lives?

Student saw a science fiction movie in which a spaceship was zooming through space. The sound of the engine was loud. However, he knew that this was not possible because sound cannot travel through space.

Why does sound travel faster in water than in air? A. because water is a denser medium than air B. because air is a denser medium than water C. because water has a larger wavelength than air D. because air has a larger wavelength than water

Convert the following degree celsius tempture to degree fahrenheit a. 40c b. 30c

Some ancient civilizations used units of measure based on the length of certain seeds. what kind of problems might you expect with such a system?

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.

A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two decimal places) ?

How Long will it take a plane flying north from Miami to reach New York City 1800 km away if the average velocity of the plane is 940 km/h

If vector A = 5.5N NE and vector B = 10m N 30° W, what is the vector product of A*B

Which is the best desciption of a molecule?