Why do helium balloons float? Talk about density of atoms and compare to elements in the air.

The overall magnification of a compound microscope with an objective lens magnification of 5 and an eyepiece magnification of 30 will be A. 6. B. 100. C. 150. D. 280.

A 130 kg block is pulled at a constant speed of 9.0 m/s across a horizontal floor by an applied force of 102 kg directed 37° above the horizontal. what is the rate at which the force does work on the block?

Find the speed of sound in air at 0 ∘C (1100 ft/s) in mph.

Future applications of protons neutrons and electrons?

The word " waxing " can replace the first word of which phrase? a) cooling temperature b) dwindling salaries c) increasing support d) running out of time

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.