Physics Homework Aid

Physics holds significant importance among the natural sciences, elucidating life's wonders and ranking among the most challenging subjects to master.

QuestionAI is a rich and user-friendly physics problem solver for novice physicists, enabling exploration of atomic properties and interactions, alongside molecular trajectories under various forces. Furthermore, you can delve into the mysteries concealed amidst galaxies with fellow physics enthusiasts. Boldly pose your conjectures and queries to the AI, and authoritative answers will readily emerge.

__ 14. How many millignams are in 2.5 kg? a 2.5times 10^5mg 2.5times 10^-4mg b. 25 mg 2.5times 10^2mg __ 15. The closeness of a measurement to its true value is a measure of its: a. usefulness. c. accuracy. b. precision. d. reproducfbility. __ 16. Which of these measurements ents is expressed to three significant figures? a 0.070mm c. 7007 mg b. 7.30times 10^-7km d. 0.007 m __ 17. A metric unit of volume is the: c. km. a.L b. mg. d. K. __ 18. The number of seconds in a 40-hour work week can be calculated as follows: a 60stimes (1min)/(60s)times (1h)/(60min)= c. 40htimes (60min)/(1h)times (60s)/(1min)= b 1stimes (1min)/(60s)times (40h)/(60min)= d. 40htimes (60min)/(40h)times (60s)/(60min)= __ 19. The metric prefix kilo-means: c. 1000 times smaller. a. 100 times smaller. b. 1000 times larger. d. 100 times larger.

B. Multiple Choice __ 11. How many significant figures are in the measurement 2103.2 g ? a. 2 C. 4 b. 3 d. 5 __ 12. Which of these equalities is not correct? a 100cg=1g C. 1cm^3=1mL b 1000mm=1m. d. 10kg=1g __ 13. How many of the zeros in the measurement 0.0000402200 m are significant? a. 2 C. 7 b. 3 d. 8 __ 14. How many milligrams are in 2.5 kg a 2.5times 10^6mg C 2.5times 10^-4mg b. 25 mg. d 2.5times 10^2mg

During which process would you expect the temperature of the surroundings to increase? Dissolving salt in water Melting ice Evaporating water Burning wood

Put the stages of the life span of the Sun in order. nebula: square red giant: square protostar: square white dwarf: square main sequence: square

(d) Two students investigated the reflection of light by a plane mirror. Figure 3 shows the different equipment the students used. Explain two ways that Method A is better than Method B. __ 1.