Energy Transfer and Heat Capacty

Energy Transfer and Heat Capacty

Answer your group discussion question together.

Water

• Shrinks to 4 C

• Expands from 4-0 C

Thermal energy transfer (heating)

• Happens a few ways

• -Conduction- Particles run into each other

• Conductors and insulators are opposites

Open Ended

Your house is 68 degrees there is both tile and carpet. Are they the same temperature? Why or why not?

Thermal Energy Transfer (heating)

• Convection- transfer of thermal energy by movement of particles from one place to another

• Radiation- thermal energy transfer by electromagnetic waves

Heat Capacity

• Thermal energy is related to work

• Heat is a form of energy and is produced regularly

• Mechanical equivalent of heat is

• 1 cal=4.186 J

• 1 kcal= 4186 J

• 1 C= 1 kcal

• 
  

Heat Capacity

• heat is represented in equations by a Q

• adding heat to a system makes it positive

• taking it away makes it negative

A 74 kg person drink a thick rich 305 C milkshake. How many stairs must this peron climb to work off the shake if each stair is 20 cm high?

• Lets first remember that energy and work are related. Q(heat) can be converted to joules from calories

• next we need to remember our work equation. work= Fxd

• then rearrange the equation to determine distance(height)

During a workout a person repeatedly lifts a 6.2 kg barbell through a distance of .58 m. how many reps of this lift are required to burn off 150 C?