Why are machines not a 100% efficient?

What makes comets different from asteroids and meteoroids? Question 8 options: A. They don't consist of ice. B. They travel in space. C. They consist of ice. D. They fly.

If samples of silver and lead each had volumes to 1 cm^3 which sample would have the greater mass and what would the difference in the mass be

A ball having a mass of 500 grams is dropped from a height of 9.00 meters what is its kinetic energy when it hits the ground

A proton at speed v = 3.00 * 105 m/s orbits at radius r = 1.00 cm outside a charged sphere. Find the sphere's charge.

A tennis ball is hit when it is 1.30 meters above the court. The ball's velocity leaving the racket is 8.08 m/s horizontally, how far away does the ball land?

What is the value of 9682 when rounded to three significant figures

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is