Between which of the following surfaces with the force of friction be smallest

If you have a device that has an energy efficiency of 0.4 and you put in 100 units of energy, how many units of useful energy will you get out of it?

Where does the suns rays strike earth most direcly and least directly

Which one of the following is a decomposition reaction? A. 2SO3 (g) → 2SO2 (g) + O2 (g) B. CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g) C. 2LiOH (s) + CO2 (g) → Li2CO3 (s) + H2O (l) D. H2 (g) + Cl2 (g) → 2HCl (g)

During World War 2, there were some cases where the crew fell out of burning aircraft without a parachute and survived the fall. Assume that the crew member reached a constant terminal speed of 126.1 km/hr prior to hitting a stack of loose hay.

the mass of a certain neutron star is 2.5x10^30kg and the radius 7000m. what is the force of gravity on a 1kg object of the surface of the neutron star

34. A steam engine operates between 300K and 600K, the maximum possible efficiency of this engine is a. 100% b. 75% c. 50% d. 25%

How many moles of phosphorus trichloride are in 200 grams of the molecule? 62.67 mol 27,466.6 mol 1.46 mol 0.69 mol

A starship passes Earth at 80% of the speed of light and sends a drone ship forward at half the speed of light rela - tive to itself. Show that the drone travels at 93% of the speed of light relative to Earth.

Rubies are used in electronics

Two kids are on a merry-go-round that is turning at a constant rate. ariel is near the outer edge, and bob is closer to the center. ariel has answer (smaller, the same, or greater angular speed?