In the reaction HF + Al AlF3 + H2, which two substances would have a coefficient of 2 if the reaction were balanced?

Check all that apply.

A. H2

B. Al

C. AlF3

D. HF

A rifle bullet travels 5000 feet in 4 seconds. What is the speed of the bullet?

The boundary of the north american plate and the african plate in the atlantic ocean is an example of which type of plate boundary?

Two resistors have resistances R1 = (24 + - 0.5) ohm and R2 = (8 + -0.3) ohm. Calculate the absolute error and the percentage relative error in calculating the combination of two resistances when they are in parallel.

Which example illustrates a chemical change?

Two different polymeric materials were evaluated to determine their respective fatigue endurance behavior. Both materials were tested separately in laboratory air and in flowing water.

A one-piece cylinder has a core section protruding from the larger drum and is free to rotate around its central axis. A rope wrapped around the drum of radius 1.39 m exerts a force of 3.34 N to the right on the cylinder.

In which of the following situations or places would you want to reduce the force of friction? More than one answer A. Skiing down a hill during a race. B. Walking down a steep hill. C. Sitting in the bed of a pickup truck while it turns a corner. D.

What are five examples that illustrate a machine or a person doing work on another?

An aerophone is an instrument that causes what to vibrate

Consider the Bose-Einstein distribution: F60 per unit energy can be written as N aE 6.) (20pts) Assuming BE <<1, obtain an expression for the average number of particles in the energy range 0SESE 7) (10pts) Assuming T-300.0K, E - 3.5 x 102 J, α = (3.