A 500. gram sample of nickle-63 has a half-life of 100. years and has decayed for 500. years. How much of the original 500. gram sample remains?

87.1 grams

574 grams

16,000 grams

15.6 grams

Which description correctly summarizes how an electric motor causes an axle to turn? O Force generated through the brushes rotates the commutators.

A particular engine takes in 10000 j of heat, does 2000 j of work, and as it runs discharges heat. its own energy is the same when it has finished as when it started. how much heat did it discharge if this is a closed system

The moon is always circling around the earth, in a stable orbit. This movement is the reason we see the different phases of the moon. The moon is not the only thing in the solar system that is in orbit.

Write the definition of a function print Grade, which takes one parameter containing a string value and returns nothing. The function prints "Grade: " followed by the string parameter.

1. A student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closer circuit. In this diagram, The lightbulb would be a. an insulator b. on c. disconnected d. off 2.

A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C.

A spring (k = 790 N/m) has a length of 48 cm when zero net force is applied to it. What will its length be when 230 N of force is applied to stretch it? Question 3 options: 3.4 m 0.77 m 3.9 m 0.29 m

Inert gas used to make bright city lights True or False

A boulder on top of a cliff has a potential energy of 12400J. How high above is the boulder?

If the graph represents speed what is measured on the x and y axes