What is the energy source that heats a contracting protostar?

You are in a hot, dense place. You are surrounded by nuclear reactions that are rapidly fusing hydrogen into helium. You notice that your surroundings are cooling and rapidly dropping in density. Within about 5 minutes, the fusion reactions stop.

In order to analyze a circuit correctly, what values should be known? A. resistances of resistors and voltages of batteries B. size of batteries and time elapsed C. temperatures of resistors and current of batteries D. thickness and length of wires

The frequency of a wave determines which of the following? loudness reflection energy pitch

What effect do oceans have on the temperature of coastal areas? A. Ocean breezes warm the coastal land constantly. B. Ocean currents always cool a coastline. C. Ocean winds prevent extremes of temperature on coastal lands. D.

Which of the following is an example of pure research? Creating new elements to study their properties Producing plastics that are heat-resistant to use in ovensDetermining how to reduce rusting on metal ships and cargo carriersFinding alternatives

A baseball flying through the air has kinetic energy because of its motion. true or false?

How many poles does Jupiter's magnetosphere have? a. 2 c. 8 b. 4 d. 9

Which describes nuclear fusion? The nuclei of two atoms combine to form a larger nucleus. The nucleus of one atom splits to form two smaller nuclei. The electrons of two atoms combine to form a cluster of electrons.

In a class debate, a student argues that the big bang theory is "just a theory." What is most likely to be this student's understanding of scientific theories? A. Theories agree with observations of nature. B. Theories are just guesses. C.

Look at the advertisement. A poster that reads, "There's more to resistors than resistance. If you're really serious about cost, be serious about quality." with tools. Which persuasive media technique is used in this advertisement