BTEC Applied Science Unit 5 physics Questions and Answers 100% Correct

What are the standard units of mass, length and time? - ANSWER-Kilograms, metres and seconds What are the SI prefixes for 10^3, 10^6 and 10^9? - ANSWER-kilo, mega, giga What are the SI prefixes for 10^-3, 10^-6 and 10^-9? - ANSWER-milli, micro, nano What is work done? - ANSWER-The energy transferred in moving something What is power? - ANSWER-the rate at which work is done What happens to a gas when it is compressed? - ANSWER-Particles get closer together Gas pressure increases More collisions between particles and container Temperature of gas rises How do you calculate work done from a P-V graph? - ANSWER-The area under the graph What is efficiency? - ANSWER-the percentage of the work input that becomes useful work output What is thermal equilibrium? - ANSWER-when two objects have the same temperatures and net heat transfer is zero What is the first law of thermodynamics? - ANSWER-The change in a system's internal energy is equal to the difference between heat added to the system from its surroundings and work done by the system on its surroundings What are ideal gases? - ANSWER-All collisions are elastic All motion is random There are no forces between particles What is absolute zero? - ANSWER-0 K Particles have 0 kinetic energy What is the second law of thermodynamics? - ANSWER-Heat will not flow from a colder body to a hotter one without an input of work. A natural process cannot fully be reversed.