Which of the following is true concerning kinetic-molecular theory and heat transfer between relatively hotter object a and relatively colder object b? a. molecules of object a collide with those of object b, and the molecules in object b move faster. b. molecules of object a collide with those of object b, and the molecules in object b move at the same speed. c. molecules of object b collide with those of object a, and the molecules in object a move faster. d. molecules of object b collide with those of object a, and the molecules in object b move slower.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.