Real world efficiency are generally very high in the 90 percent range, true or false?

A student hypothesizes that the bubbles on this water plant are oxygen gas (o2). however, identifying a gas as o2 with direct evidence requires many kinds of equipment. which observation would provide indirect evidence that the bubbles are not o2? a.

What is the time it takes to stop a rolling cart traveling forward with 30N and has a change in momentum of 60 kgm/s

Which example best illustrates kinetic energy? A. A car parked on top a hill B. A book on top of a book shelf C. A comet that is flying through space D. A pencil laying down on a desk

Everyone is trying to living a perfect life via social media.

In most circumstances, the normal force acting on an objectand the force of static friction do no work on the object. however, the reason that the work is zero is different for the two cases. explain why each does no work.

A car's position in relation to time is plotted on the graph. What is the car's average velocity for segment C? A) - 4 m/s B) - 0.25 m/s C) 0.25 m/s D) 4 m/s

What percent of my Iodine-131 sample will be left after 7 half-lives?

A 58.0 kg snow skier is on the top of 351 m high hill. After she has gone down a vertical distance of 142 m, what is her mechanical energy? Explain your answer (CER) !

A sphere has a mass of 2.10kg and travels along a horizontal plane at the velocity of 12.2m/s. Find the energy

What is the force required to accelerate a baseball with a mass of 0.145 kilograms and an acceleration of 35.00 meters/second squared?