The piece of wood shown above has a mass of 20 grams. Calculate its volume and density. Then use Figure 2.9 on page 37 to determine which type of wood it is. What are the two factors that
determine a material's density?

2cm
5cm
3cm

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?