What two elements existed before the first stars?

Which atmospheric layer prevents meteoroids from reaching earth's surface

What formula is used to calculate average speed?

A tractor trailer truck carrying boxes of toy rubber ducks stops at a weigh station on the highway. The driver is told that the truck weighs 44,000 pounds. c. The truck drops off its load of toys, then stops at a second weigh station.

What holds the positively charged metal ions together within a metallic bond?

Which of the following processes involves the greatest amount of water loss from the earths surface in florida?

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?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.