Scientists use different types of microscopes to observe objects that are not visible to the naked eye. a scientist is reviewing various samples of pond water to determine what species of microorganisms live in the pond. the scientist wishes to make drawings of the structure of each microorganism and study each one's method of movement. which of the following microscopes would be best for the scientist to use?
a.
transmission electron microscope
b.
scanning electron microscope
c.
compound light microscope
d.
dissecting microscope

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Blank liquids and gases exert a buoyant force on objects placed in them

Aspring has a relaxed length of 33 cm (0.33 m) and its spring stiffness is 6 n/m. you glue a 76 gram block (0.076 kg) to the top of the spring, and push the block down, compressing the spring so its total length is 15 cm. you make sure the block is at rest, then at time t=0 you quickly move your hand away. the block begins to move upward, because the upward force on the block by the spring is greater than the downward force on the block by the earth. calculate y vs. time for the block during a 0.09-second interval after you release the block, by applying the momentum principle in three steps each of 0.03-second duration.