Which of these is a mixture of compounds?

A) sodium (NA) and magnesium (Mg)

B) lithium (Li) and table salt (NaCl)

C) CO2 and CH4

D) hydrogen (H2) and oxygen (O2) combining to make water H2O

A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. if you cut the magnet in half, the right half will

The term "accuracy" best refers to which of the following? a. whether or not a measurement is correct b. how "close together" a set of measurements is c. whether or not a tool for making measurements is useful d.

The study of celestial objects in the universe describes which field of physical science? a. Physics b. Chemistry c. Astronomy d. None of the above User: Scientific knowledge is

An electrical motor provides 0.50W of mechanical power. How much time will it take motor to lift a 0.1 kg mass at constant speed form to a shelf 2.0 m above the floor? a. 0.25s b. 0.40s c. 1.0s d. 4.0s

Mr. Harden's class decides to perform an experiment to determine how long it takes different objects to hit the floor when dropped from a desk.

Compare and contrast the terms melting and freezing

A medical cyclotron used in the production of medical isotopes accelerates protons to 6.5 MeV. The magnetic field in the cyclotron is 1.9 T.

What is the speed of sound in a vacuum?

An object has 60 j of potential energy and 40 j of kinetic energy. then 10 j of the potential energy is converted into kinetic energy. how much work was done on the object?

At what height above earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%?