Ques: Q: What happens to energy in a closed system? Read this paragraph and choose the correct option from the provided answers: Energy is conserved in a closed system. That is, if you add up all the energy of an object(s) at one time it will equal all the energy of said object(s) at a later time. A closed system is a system where no energy is transferred in or out. The total energy of the universe is a constant (i. e. it does not change). The problems below do not consider the situation of energy transfer (called work). So friction and other sources where energy leaves the system are not present. Thus, one simply adds up all the potential energy and kinetic energy before and sets it equal to the addition of the total potential energy and kinetic energy after . Choices: - is replicated - is destroyed - is wasted - is conserved A:
Ans: is conserved

Ques: Q: How close a measurement is to the correct value for that measurement is known as what? Read this paragraph and choose the correct option from the provided answers: Accuracy and Precision of a Measurement Science is based on observation and experimentthat is, on measurements. Accuracy is how close a measurement is to the correct value for that measurement. For example, let us say that you are measuring the length of standard computer paper. The packaging in which you purchased the paper states that it is 11.0 inches long. You measure the length of the paper three times and obtain the following measurements: 11.1 in. , 11.2 in. , and 10.9 in. These measurements are quite accurate because they are very close to the correct value of 11.0 inches. In contrast, if you had obtained a measurement of 12 inches, your measurement would not be very accurate. The precision of a measurement system is refers to how close the agreement is between repeated measurements (which are repeated under the same conditions). Consider the example of the paper measurements. The precision of the measurements refers to the spread of the measured values. One way to analyze the precision of the measurements would be to determine the. Choices: - frequency - rate - temperature - accuracy A:
Ans: accuracy

Ques: Q: The force exerted by a diving board is conservative, provided the internal friction is this? Read this paragraph and choose the correct option from the provided answers: 7.4 Conservative Forces and Potential Energy 9. What is a conservative force? 10. The force exerted by a diving board is conservative, provided the internal friction is negligible. Assuming friction is negligible, describe changes in the potential energy of a diving board as a swimmer dives from it, starting just before the swimmer steps on the board until just after his feet leave it. Define mechanical energy. What is the relationship of mechanical energy to nonconservative forces? What happens to mechanical energy if only conservative forces act? 12. What is the relationship of potential energy to conservative force?. Choices: - static - intrinsic - significant - negligible A:
Ans: negligible

Ques: Q: Where do benthos live in oceans? Read this paragraph and choose the correct option from the provided answers: Three main groups of ocean life are plankton, nekton, and benthos. Plankton float in the water. Nekton swim through the water. Benthos live on the ocean floor. Choices: - On the ocean surface - In deep water - In coral reefs - on the ocean floor A:
Ans:
on the ocean floor