Explain why engineers use gears in design? [2 pts] Circle either True or False for the statements below. True or False If two interlocking gears have the same radius, then the absolute value of the torque in each gear will be the same. [2 pts] True or False You can increase power by increasing the angular velocity of the shaft. [2 pts] True or False You can increase power by slowing down the frequency of the shaft. [2 pts] True or False Interlocking gears of different radii must experience the same angle of twist.

Engineers use gears in design for transmitting motion, controlling speed and power, and adjusting torque, while the statements are explained as follows: False, True, False, True.

Engineers use gears in design for various reasons, including:

Transmitting and converting rotational motion: Gears are used to transfer motion between rotating shafts, change the direction of rotation, or change the speed of rotation.

Increasing or decreasing torque: Gears allow engineers to amplify or reduce the torque applied to a system, depending on the gear ratio.

Controlling speed and power: By selecting different gear ratios, engineers can control the speed and power output of a system.

Regarding the statements:

False: The torque in each gear depends on the force applied and the radius of the gear. If two interlocking gears have the same radius, the torque can still be different if the applied forces are different.

True: Increasing the angular velocity (rotational speed) of the shaft increases the power output of the system, assuming the torque remains constant.

False: Slowing down the frequency (rotational speed) of the shaft reduces the power output of the system since power is directly proportional to both torque and rotational speed.

True: Interlocking gears of different radii will experience different angles of twist as they rotate due to the difference in the circumference and rotational speed of the gears.

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Read the following passage:
I knew how to act and the right things to say, but I felt like a phony. I really cared about Lilly and I wanted her parents to like me, but this world was so different from mine. I wasn't comfortable in these clothes or around their friends. I felt like they could see right through me - like they knew where I came from and who my parents were. I decided to reveal my insecurities to Lilly, and she quickly put my mind at ease. She explained how much her family admired me and wanted to me to be a part of them.
Which statement describes the aesthetic impact the author most likely intends the resolution to have on the reader?
A. The author wants readers to gain a sense of relief and satisfaction.
B. The author wants readers to consider the purpose of family conflicts.
C. The author wants readers to feel disappointment and sadness.
D. The author wants readers to question the reliability of the narrator.

This is an excerpt from- Sexual selection and special design authored by Steven W Gangestad, in the Annals New York academy of Science. Answer the questions based on the excerpt provided below. "…..Women claim men’s scent importantly affects their attraction to them. Moreover, evidence suggests that women’s olfaction changes across menstrual cycle. For instance, women tend to rate androstenone, a steroid found in men’s sweat, more positively near ovulation than during non-fertile phases.
In an initial study, we asked 41 men to wear T-shirt for two consecutive nights. During the two-day period, they were to wash only with unscented soap, not to wear any fragrances or colognes, not eat certain strong foods, and not to sleep with another person. They dropped shirts off at our lab on a designated morning. Later that same morning and throughout the next day, women came in, smelled each T-shirt and rated its attractiveness (a composite of two ratings: pleasantness and sexiness). For each woman, we regressed her rating on men’s symmetry to yield "a preference for symmetry" score (the regression slope, a measure of the change in rating as a function of a change in symmetry). We then examined the correlation of these preference scores with women’s estimated fertility based on their self-reported day of the cycle and actuarial data on probability of conception for each day. Across 28 normally ovulating women the correlation was 0.54, p<0.001. Examination of the bivariate plot revealed that when women’s fertility was near zero (very early and late in the cycle), they had no systematic preference for the scent of either symmetrical or asymmetrical men. As their fertility increased, however, they increasingly preferred the scent of symmetrical men.
A subsequent study replicated and extended that result in a larger sample of about 50 normally ovulating women and 80 men. Women’s preference for symmetry correlated 0.42 with their fertility based on the day of their cycle, p<0.001. We asked men how many times they showered and whether they wore any fragrances. The number of times men showered predicted the attractiveness of their scent. When this variable was partialled out and all men who wore fragrances were eliminated from the analysis, the correlation between women’s symmetry and their fertility actually increased, r=0.48, p<0.001. In a third study in our lab, this result was once again replicated, r=0.26, p<0.05. When data from all three studies were pooled, the correlation between women’s preference for symmetry and the fertile phase of their cycle was r=0.40, p<0.0001." [Note: p values reported here means that correlation r is statistically significant]
From this scenario, the immune systems of humans should be exceptionally high. Yet, there is a rising incidence of autoimmune diseases and lack thereof immunity. What form of selection do you think is at play here? Explain.