Ahot 0.25-kg piece of iron is placed in a calorimeter containing room temperature water. how much heat is lost by the iron as it cools from 125c to 75c? how much heat is gained by the water?
5. the temperature of 2.500 kg substance rises from 20 oc to 60 oc when it absorbs 23,500 joules of heat. calculate the specific heat capacity of the substance. what is the identity of the substance?
7. using the specific heat capacities of water and steam, explain which would be a better coolant for your car's engine if equal masses of each were used.
8. a cube of lead has a temperature of 18c. a second identical cube of lead is twice as hot. what is the temperature of the second lead cube?
2. for each pair of substances, identify the substance that will take more energy to heat from 20c to 100c and explain why. specific heat for water- 4180 j/kg°c. specific heat for silver- 235 j/kg°c. specific heat for iron- 450 j/kg°c.
a. 30 g of water vs. 300 g of water
b. 500 g of iron vs. 500 g of silver

Avalue that describes how heavy an object is and is related to the force of gravity is

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.

Amass m = 74 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 18.4 m and finally a flat straight section at the same height as the center of the loop (18.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.) 1. what is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track? 2. what height above the ground must the mass begin to make it around the loop-the-loop? 3. if the mass has just enough speed to make it around the loop without leaving the track, what will its speed be at the bottom of the loop? 4. if the mass has just enough speed to make it around the loop without leaving the track, what is its speed at the final flat level (18.4 m off the ground)? 5. now a spring with spring constant k = 15600 n/m is used on the final flat surface to stop the mass. how far does the spring compress?