If we have evidence that certain gases are harmful to our atmosphere, then why are we still using them?

When a 440-Hz tuning fork and a piano key are struck together, five beats are heard. If the pitch of the note on the piano is higher than the tuning fork, what is the frequency of the note? 440 Hz 445 Hz 435 Hz 435 or 445 Hz

Ions can have a positive or negative charge. a. True b. False

Muscles use force to move objects. When using a ramp to do work, would your muscles use more force or less force?

What would we see if we were able to travel within the multiverse?

Which of the following sentences about the velocity of an object is NOT true? A. The object's velocity is a scalar quantity. B. When the direction of motion changes, the velocity changes. C.

When a 3.50-g sample of liquid octane (c8h18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.3 ∘c. the heat capacity of the calorimeter, measured in a separate experiment, is 6.22 kj/∘c?

Air has pressure because a. the stratosphere is thick b. air has mass c. wind moves the air d. temperature warms the air

What types of exercises for stomach

Which states the law of conservation of energy? A. Energy cannot be created or destroyed, but it can be converted or changed into different forms. B. Energy can be created or destroyed, and it can be converted or changed into different forms. C.

What is density? How can you find density?