Select three (3) topics, preferably engineering in nature, and write the rescarch questions in each of the topic using the format below. TOPICS RESEARCH QUESTIONS

An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).

1. Please help me solve this mech. engineering question

INDUSTRIAL ENGINEERING and ELECTRONICS   Discuss briefly the inventions and significant technologies employed in each of the four Industrial Revolutions (Industry 1.0–Industry 4.0) and how they made people's lives simpler, particularly in terms of production and manufacturing.   Please explain clearly thank you.

You are designing a solar panel cover to protect rooftop solar panels from beingdamaged by debris.  At some point during the day, the panels form a 60-degree angle relative to the sun’s rays. The panels are 3m x 1m wide. a) What property of incident radiation do you want to maximize to allow the maximize amount of light to hit the panels below your cover? b) If the absorptivity is 0.2 and the reflectivity is 0.1, what percentage of the radiation reaches the solar panels? c) If the irradiation, G, is 220 W/m2, how much power passes into the solar panels below the cover?