Dinosaur fossils are too old to be reliably dated using carbon-14, which has a half-life of about 5730 years. suppose we had a 68 million year old dinosaur fossil. how much of the living dinosaur's 14c would be remaining today? (round your answer to five decimal places.)

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n