Which of the following items does not use a wheel and axle?

A. a doorknob

B. a light bulb

C. a faucet handle

D. a clock with hands

A plane flies 600 kilometers away from its bad at 400 meters per second then flies back to its base at 600 meters per second. What is it's average velocity?

An explorer in Antarctica leaves his shelter during a whiteout. He takes 40 steps northeast, next 80 steps at 60o north of west, and then 50 steps due south. Assume all of his steps are equal in length.

10. Rank the following in terms of increasing power. A. Doing 100 J of work in 10 seconds. B. Doing 100 J of work in 5 seconds. C. Doing 200 J of work in 5 seconds. D. Doing 400 J of work in 30 seconds.

Which type of electromagnetic wave enables skin cells to produce vitamin D

Select the statements that are TRUE. Electrophilic aromatic substitution reactions have energies of activation that are very low. Dienes and alkenes are much more stable than benzene rings.

The ball is moving at a constant speed of 0.5 m/s for 2.3 seconds how far does it go?

Which of these is a mixture? calcium carbon dioxide salt water potassium

A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

What does it mean when we say science is a cycle?

1) Which is a characteristic of a metal? A) It looks dull. B) It feels brittle. C) It is a good insulator. D) It is a good conductor of electricity. 2)