Which of the following statements apply to electric charges ?
A. If a negatively charged rod is brought close to a positively charged object, the two objects will repel.
B. If a positively charge rod is brought close to positively charges object, the two objects will repel.
C. There are three types of charges.
D. Like charges attract, opposite charges repel.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

The substances that are necessary for producing of certain hormones and that store and transport vitamins

The items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element