Scientists believe Earth is about how many billion years old

What does a Lewis structure diagram represent? Select one: a. The atomic symbol of an element surrounded by valence electrons b. The atomic mass of an element c. The name of an element surrounded by the number of protons d.

A 10.0 kg and a 2.0 kg cart approach each other on a horizontal frictionless air track. Their total kinetic energy before collision is 96 J. Assume their collision is elastic. What is the final speed in m/s of the 10.0 kg mass if that of the 2.

Energy moves through the plants and animals in an ecosystem by way of.

Which best describes proper disposal technique? A bin should be labeled "chemical wastes and hazardous waste." A bin should be labeled "chemical wastes and broken glass." Students should know proper disposal of the chemicals they use.

A 50kg boy jumps off the back of a 4 kg skateboard moving forward. Find the skateboard's velocity immediately after the boy jumps, assuming that the skateboard's initial velocity is 5 m/s and the boy's velocity when jumping off the back is 2.

A. Which skill related fitness component is your strongest and weakest?

A 100 N box is placed on an inclined plane that makes a 30° angle with the horizontal. Calculate the component of gravitational force that acts down the inclined plane. A. 25 N B. 50 N C. 87 N D. 100 N

Approximately how many kelvins are equal to 60 c? a. 289k b. 323k c. 333k d. 413k

What are two ways to change velocity?

What is the main optical element of a refracting telescope?