Will the light from two very close stars produce an interference pattern?
a. yes; intense light from two nearby stars creates very obvious interference patterns.
b. no; the light from two different incandescent objects is not coherent, and is emitted in a range of frequencies.
c. no; the light is too intense to produce a discernable interference pattern, it gets washed out.
d. yes; if they are very close to each other, the light has a large overlapping area and in this area you will see interference.

The density of a substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

The consumption of fossil fuels could be