A machine supply energy at a rate of 4000 W and does used to work at a rate of 3760 W what is the efficiency of the machine?

An elevator of mass 3000 kg is ascending at a steady speed of 2.0 m/s. What is the force in the cable supporting the elevator?

An athlete whose mass is 97.0 kg kg is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 420 N N. He lifts the barbell a distance of 0.65 m m in a time of 1.5 s s.

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? A) Solid melts. B) Heat is given off.

If our Sun and solar system had formed at the same time as the very first stars in the universe, describe how and why our solar system would be different than the one we have today and the impact this would likely have had on the formation of life.

What effect does solar wind have on mercury Venus and mars

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?

A pendulum bob is made from a sphere filled with water. What would happen to the frequency of vibration of this pendulum if the sphere had a hole in it that allowed the water to leak out slowly?

Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor when its total mechanical energy is 41.70 J? Round to the nearest number.

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines