Why are some isotopes used as tracers?

A. They leave visible trails.

B. They bind with all molecules.

C. They decay at a predictable rate.

D. They are uniquely identified like fingerprints

True or False? In Exercises 43 and 44, determine whether each statement is true or false. If a statement is true, give a reason or cite an appropriate statement from the text.

Why is it difficult to use the law of conservation of energy to calculate the effects of a collision? O A. Energy is not conserved. O B. Energy is only conserved during perfectly inelastic collisions. O C.

Open the Earth Science textbook to page 239 and summarize what "Wegener's Hypothesis" is.

Which causes a rainbow in the sky? a. Sunlight (white light) is refracted as it passes through different layers in the atmosphere. b. Sunlight (white light) refracts when it passes through droplets of water in the atmosphere. c.

Which statement is a scientific theory? the acceleration of an object increases as the force on an object increases. all matter is made up of particles, called atoms, that are constantly moving.

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?

Relationship between acceleration and free fall

A SI unit used to measure force, equal to less than one-quarter of a pound, is the what

What basic form of energy is present in blowing wind?