What does kepler's second law state? a. planets travel in ellipses. b. planets sweep equal areas in equal times. c. a planet's apparent backward movement is termed retrograde motion. d. an object's orbital period is related to its distance from the object it orbits.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?