Astronaut Neil during his lunar mission recorded his weight. He noticed a big difference in his weight compared to his weight taken when he was on earth. If his weight on earth was 90kgs, what would be his weight on moon and what could be the reason for this difference? a. His weight will be 5kg; this is because moon’s gravity is 1/10th as compared to that of the earth.
b. His weight will be 45kg; this is because moon’s gravity is 1/7th as compared to that of the earth.
c. His weight will be 5kg; this is because moon’s gravity is 1/8th as compared to that of the earth.
d. His weight will be 15kg; this is because moon’s gravity is 1/6th as compared to that of the earth.

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.