Which is the correctly balanced equation for the reaction of rust, Fe2O3, and hydrochloric acid, HCl? Fe2O3 + HCl → FeCl3 + H2O Fe2O3 + 3 HCl → 2 FeCl3 + H2O Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O Fe2O3 + 3 HCl → 2 FeCl3 + 3 H2O

For work to be done on a block of wood, which of the following must happen?

If a skater who is spinning pulls her arms in so as to reduce her rotational inertia by half, by how much will her angular momentum change? by how much will her rate of spin change?

Why does lowering the centre of gravity increase stability?

The following two formulas are equivalent: D = m / V and V = m / D. true or false

1. A speed-time graph shows that a car moves at 20 m/s for 15 s. The car's speed then steadily decreases until it comes to a stop at 40 s. Which of the following describes the slope of the speed-time graph from 15 s to 40 s? A.

Which of the following statements does not describe the structure of an atom? a. An atom has a small, dense center called the nucleus. b. Inside the nucleus of an atom are protons and electrons. c. Protons are positively charged sub-atomic particles.

A. Which skill related fitness component is your strongest and weakest?

A 100 N box is placed on an inclined plane that makes a 30° angle with the horizontal. Calculate the component of gravitational force that acts down the inclined plane. A. 25 N B. 50 N C. 87 N D. 100 N

Approximately how many kelvins are equal to 60 c? a. 289k b. 323k c. 333k d. 413k

What are two ways to change velocity?