Scientists develop theories to explain natural events. What causes scientists to reject even long-held theories and replace them with newer theories?

A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s. what is the magnitude of the angular acceleration of the fan?

Which one of the following accurately describes the force of gravity

When you gain weight, what happens to your mass and to gravity?

Which statements are explained by Newton's law of universal gravitation? A) Heavier objects fall faster than lighter objects. B) The strength of Earth's gravity decreases as an object gets farther from Earth.

What is the force between two balloons with a negative charge of 1.6 x 10^-10C if the balloons are 5.0 cm apart

What has become an important alternative to Piagetian approaches?

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?

What's the definition of: • cellular respiration • photosynthesis

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above