1. What conditions must exist in order for a force to do work on an object?

Why does air resistance increase when a sky diver Opens his parachute?

About 30 miles Into Earth, the speed of selsmic (earthquake) wave ut 30 miles Into Earth, the spe of seismic (eartha e) waves Increases.

Blue light, which has a wavelength of about 475 nm, is made to pass through a slit of a diffraction grating that has 425 lines per mm and forms a first-order bright band. What is the angle of diffraction? Round answer to the nearest whole number.

the law of reflection states that if the angle of incidence is 77 degrees the angle of reflection is

The element boron (B, atomic number 5 and atomic mass 11) is right above aluminum (Al, atomic number 13 and atomic mass 27) in the periodic table. How many more electrons does aluminum have than boron? Why?

Sara tells Michael she is 160 centimeters tall, while Michael says

Express 9.39 x 109 seconds in terms of days

What is the energy equivalent of 5.0 kg of mass? be sure to show all work to support your answer?

An ant carries food at a speed of 1 cm/s. How long will it take the ant to carry a cookie crumb from the kitchen table to the ant hill, a distance of 50 m? Express your answer in seconds, minutes and hours.

What must you know in order to determine the gravitational force between two objects?