Work output of a machine is always less that the work input due too

Which of the following is NOT true of exercise machines? A. Most exercise machines are expensive to purchase individually. B. Most exercise machines require spotters for safe operation. C.

A hockey goalie is standing on ice. Another player fires a puck (m = 0.170 kg) at the goalie with a velocity of + 41.0 m/s. (a) If the goalie catches the puck with his glove in a time of 2.

Energy transformed by a moving object is

In the past, how did people use the systematic movement of celestial bodies? Select all that apply. making agricultural decisions shipping navigation predicting the future spiritual and religious practices tracking storms

A certain rifle bullet has a mass of 6.45 g. Calculate the de Broglie wavelength of the bullet traveling at 1313 miles per hour.

What does deltaX mean in physics?

Which activity involves using fossil fuels directly or indirectly? 1) eating fresh fruit for a snack 2) cooking hot dogs on a campfire 3) using crayons to color 4) walking to school

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction

Where would aliens be if they really do exist here on Earth?