A good heat conductor is   Question 1 options: 1 a poor insulator. 2 neither of these 3 a good insulator.

Homework 3: Problem 9:   An electric coffeemaker has a 790-W heating element. The specific heat of water is 4.19 × 103 J/(kg⋅°C).   How long, in seconds, does it take the coffeemaker to heat 0.57 L of water from 18°C to 95°C, assuming all the heat produced by the heating element goes into the water?  Δt = ______

Review 8-64 (algorithmic) Question Help ▼ When boiling water, a hot plate takes an average of 8 minutes [min] and 35 seconds [s] to boil 110 milliliters [mL] of water. Assume the temperature in the lab is 71 degrees Fahrenheit ["F]. The hot plate is rated to provide 385 watts [W]. If we wish to boil 110 milliliters [mL] of acetone using this same hot plate, how long do we expect the process to take? Acetone has a boiling point of 56 degrees Celsius [c]. [Hint: you must determine the efficiency of the hotplate.] Click the icon to view conversion formulas for temperature scales. Click the icon to view the factors for conversions involving temperature differences. Click the icon to view the conversion table. E Click the icon to view the density of water. E Click the icon to view the table of specific heats. E Click the icon to view the specific gravities of liquids. The time required to boil 110 mL of acetone is s. (Round your answer to the nearest whole number.) More Enter your answer in…

A 1.82 m wide by 1.11 m high metal plate must be insulated to prevent contact burn injuries.  If the heat transfer rate is 136 W and the temperature across the insulation must be reduced from 87.3°C to 40.3°C, what is the minimum thickness (in cm) of insulation required [round your final answer to two decimal places]? {kins = 0.031 W/m∙K}