The fuel is ignited and through work and heat, the potato is expelled. If a potato is ejected from a gun when the ignition of fuel imparts 950 J of work on the potato and releases 1555 J of heat, what is the change in internal energy of the system in J

The change on the internal energy of the system is -2505 joules

Explanation:

To solve this problem, we're going to use the first law of thermodynamics, that it's essentially a law of conservation of energy. It states that the change on the internal energy of a system is the sum of the work (performed on the system or performed by the system) and the heat the system exchange with the surroundings (could be entering on the system or leaving the system), mathematically:

with ΔU the change on the internal energy, Q the heat and W the work.

As the question say the gun imparts on the potato 950 joules of work, that means the work is done by the gone so by convention it's negative. The heat released is 1555 joules and because is leaving the system is negative too, then:

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.