Which products do you think required scientific knowledge to develop? Check all that apply.

_ a flashlight

_ a cell phone

_ a hair dryer

_ eyeglasses

_ a microwave

_ a household cleaner

Scarcity is not usually a problem in economics true or false

Which wave interaction causes you to hear your voice a second time after you' shout in a gymnasium?

A weightlifter can lift 220lbs. (assume 1kg weighs 2.2lbs) If he lifts the weight 2m above the floor, how much work did he do? Follow up: if the weightlifter lifts the weight 1.2 seconds, how much power does he generate?

A baseball pitcher is on the mound preparing for the pitch. Which of Newton's law is demonstrating by the ball before it is thrown? A. Newton's 1st law B. Newton's 2nd law C. Newton's 3rd law D. Newton's law of gravity

What is the total mechanical energy of a 200 kg roller coaster moving with a velocity of 16 m/s at a height of 18 m above the ground?

The state of matter that has particles that slide by one another

The waves produced by earthquakes are known as seismic waves.

Select the correct answer. What is the function of polarized glasses? OA. to eliminate horizontally polarized light OB. to eliminate vertically polarized light c. to allow all light OD. to block all polarized light

Birds, squirrels, and chipmunks all living in the same tree, using the same resources, are an example of:

Does air resistence decrease with speed