Identify the chemical change below

a) a piece of wood burns in a fire

b) two pieces of paper are stapled together

c) water is removed by drying wet clothes on a laundry line

d) a large log is cut into boards

What kind of matter fills a ballon?

What is carbon dating

If the output force is greater than the input force of a simple machine, the mechanical advantage is less than one. A. True B. False

Idil's momentum is 107 kg·m/sec when she walks at 3.4 m/sec. What's her mass?

Which of use following provides electrical safety?

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.

What methods can be used to break down substances into elements

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

The hinge at A and cable BDC support beam ABC. Cable BDC passes over the pulley D that is pinned to the ceiling. (Assume that the + x-axis is to the right and the + y-axis is up along the page.