Which observations correctly describe the second law of thermodynamics? Check all that apply. Thermal energy that is not used to do work is often released to the surroundings. Thermal energy flows from a cooler object to a warmer object. Thermal energy flows from a warmer object to a cooler object. Thermal energy is released as unusable energy by a heat engine, which is never 100 percent efficient. Thermal energy flows when two objects in contact have a temperature difference.

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.

The volume of the a sphere whoes diameter is 18 cm is cubic cm . if it's diameter were reduced by half, it's volume would be of its original volume