How many trees were sold in all during 1999 and 2000?

The specific heat capacity of iron is 440j (kgK) How much thermal energy is gained when the temeperature of 800g of iron is raised by 120 degrees C?

you and a friend sit still on a spinning merry-go-round. The merry-go-round spins 5 times every second, and to a stationary observer, you have a speed of 9m/s. From your frame of reference, what is the speed of your friend?

After walking across a carpeted floor in socks, Jim brings his finger near a metal doorknob and receives a shock. what does that demonstrate

Punnett squares are convenient ways to represent the types and frequencies of gametes and progeny in experimental crosses. this punnett square shows the results of a yy x yy cross to form f2 progeny.

Define "Law of Conservation of Energy"

Steam moves into a cylinder of a steam engine at a constant pressure and does 2.34 J of work on a piston. The diameter of the piston is 3.4 cm and the piston travels 4.6cm. What is the pressure of the steam?

Identify each type of simple machine.

A car's speedometer reads 20 m/s after accelerating, from a standing start, for 25s. What was the magnitude of its acceleration?

What happens to the period of a pendulum and the period of a spring as the amplitude of the oscillation increases? Briefly give an explanation for this relationship.

The element that is most abundant in earth is