Explain the differences between a physical and chemical change, and give examples of each.

What causes the ocean waves that surfers use for their sport? a. density differences in water b. salinity differences in water c. sunlight heating water d. wind blowing across water

A horizontal conveyer belt moving at 3 ft/s receives sand from a hopper. The sand falls vertically from the hopper to the belt at a speed of 5 ft/s and a flow rate of 500 lbm/s (the density of sand is ~2700 lbm/cubic yard).

A bond formed by the attraction between positively charged metal ions and the electrons around them. a. Metallic bond b. Polyatomic ion c. Covalent bond

What determines the pitch of a sound wave

Which statements describe the applications of nuclear medicine scans? Check all that apply. O assess disease progression and tissue function utilize ultrasound utilize a biologically active molecule require a CT scan utilize a radionuclide tracer

A charge if 2 nC is placed 10cm to the right of a conducting sphere with a diameter of 2 cm. A charge of 5 nC is placed 10 nC to the left of the same sphere. determine the charge at the center of the sphere.

1) How is chemical energy transformed into potential energy?

A double-paned window has two glass panes separated by a layer of air. Why is air, rather than glass, used to fill this space?

To determine waves frequency you must know the what

What is the average speed in miles per hour of the car that traveled a total of 200 miles in 5.5 hours