Why do you think it is difficult to use carbon-14 to determine the age of extremely old objects (over 50,000 years)?

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon