Match each scientist with the best description of his work apex. a. dalton b. thomson c. bohr d. de broglie and schrodinger e. chadwick f. mendeleev g. moseley 1.atoms contain neutrons 2.there are negatively charged particles in atoms 3.the periodic table is organized by atomic number 4.electrons are a negatively charged cloud around the nucleus 5.matter is made up of atoms 6.the periodic table is organized by atomic mass 7.electrons move in orbits around the nucleus

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same