Are energy transformations always efficient

What two factors affect the gravitational force between two objects

The gravitational force between two objects with masses, m1 and m2, separated by a distance "r" is given by F = (Gm1m2) / r2, where G is a constant. When the mass of m2 increases, the force between the two objects:

There is a electric train traveling north, and the wind is blowing south. Which way is the steam going.

The earth pulls on an apple with 0.5 N of force. Which statement is the most accurate about this situation? a. The apple is in static equilibrium. b.

An engineer weighs a sample of mercury (ρ = 13.6 * 103 kg/m3) and finds that the weight of the sample is 6.0 n. what is the sample's volume? the acceleration of gravity is 9.81 m/s 2. answer in units of m3.

Why would an object float in water, but sink in rubbing alcohol?

What happens to the volume of solids, liquids, and gases when they are heated. Devise your own chart for your answer.

Which chemical compounds absorb large amounts of the sun's energy in the atmosphere? Select one: a. Nitrogen compounds, water vapor, and carbon compounds b. Carbon dioxide, water vapor, and dust c. Methane, nitrogen compounds, and dust d.

As protostars continue to contract, their cores become hotter and more dense until what process begins ...

Emily jogs 3 laps at the track to warm up. She jogs at 5 mph. Then she runs 3 more laps at 7 mph. What is true about her average speed and her average velocity?