When using a real machine to do work, input work will always be

Suppose you are on a conveyor belt walkway at an airport. The walkway is moving at 0.50 m/s. You walk backward at 0.80 m/s to hand your suitcase to a friend who is 3.0 m behind you. A security guard stands alongside the walkway watching this.

A student has a weight of 534 N. The student sits in a chair. When the student sits in a chair, how much force does the chair apply to the student?

For which of these questions could a testable hypothesis be developed? Check all that apply. A. Are gases better than solids? B. Do different liquids freeze at the same rate? C.

New York's Finger Lakes were formed by the same process as the Great Lakes. What was this process? A-melting of the polar ice cap B-movement of tectonic plates C-movement of glaciers D-erosion

Two objects of the same mass are on two different planets. Planet A has a force of gravity that is weaker than that of planet B. How will the weights of the objects compare to each other? The weights of the objects will be the same.

A taxi hurries for 1 3/4 hours with a constant speed of 84 mph and then for another 1 hour 45 minutes with a constant speed of 24 mph. what is its average speed for the total trip?

A carbon atom has how many valence electrons?

X-rays UV light waves Sound waves Earthquake waves. All of these have which characteristic in common?

V=345m/s, 7210Hz, X=?

As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e. Determine the energy of the absorbed photon in electronvolts.