Which of the following is a physical change? adding acid to milk to form sour cream, adding enzymes to milk to form cheese, adding bacteria to heated milk to form yogurt, adding sugar to milk to form sweetened milk

Antonio wants to replace the lightbulbs in his house. How much money would he save in one year by replacing 10 incandescent bulbs with 10 CFL bulbs? incandescent$1.47 per bulb CFL $3.99 annual operating cost incandescent $32.86 CFL $7.67

Sound with frequency 1240 Hz leaves a room through a doorway with a width of 1.13 m. At what minimum angle relative to the centerline perpendicular to the doorway will someone outside the room hear no sound?

A train is accelerating at a rate of 2m/s2. if it's initial velocity is 20 m/s, what is its velocity after 30 seconds

One timing problem in using fiscal policy to counter a recession is the "legislative lag" that occurs between the

If you weigh 150 lbs. on the surface of Earth, how much would you weigh on Venus? On Mars?

Which sentence states Newton's third law? If two objects collide, each object exerts a force in the same direction as the other. If two objects collide, each object exerts a force equal to and in the opposite direction of the other.

Why did the chicken cross the road.

A 98.1 kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.69 rad/s. A monkey drops a 9.29 kg bunch of bananas vertically onto the platform.

7. A type of non-renewable energy would be: O wind O petroleum O water solar

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?