What is one of the hardest tasks for researchers?

As an object falls to the ground, what happens to its energy? Ignore air resistance in this scenario. A) energy is converted from gravitational potential energy to kinetic energy.

A 76-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 840 N. What is the acceleration of the elevator? 1.25 Correct: Your answer is correct. m/s2 upward

Atoms are the smallest portions of an element that retain the original characteristics of the element. True or false

A 25.5 kg child swings on a swing set. At the top of the swing's arc, the child reaches a height of 1.50 m from the ground. What are the child's PE and KE at the top of the arc? 188 J and 1883 OJ and 375) 375 J and OJ

3. One atom of silicon can properly be combined in a compound with A. One atom of chlorine. B. Three atoms of hydrogen. C. Two atoms of oxygen. D. Four atoms of calcium.

The equation e = mc2 relates mass and a. energy b. force c. work d. gravity

What should a scientist do to use scientific methods for determining the relative age of Earth's rocks? A be biased in opinion B disregard views of others C use creative ideas D prove that methods are non-testable

If a sample of gas is heated at a constant pressure what will happen to the volume of the gas

1. What is the speed of sound in air that has a temperature of 90.0 °C?

What effect does a doubling of the mass have upon the acceleration of the object? Be quantitative.