An insulated lunch bag keeps food warm by a. increasing the thermal energy of the lunch bag. b. increasing the thermal energy of the food. c. slowing the transfer of thermal energy from the air outside the bag to the food inside the bag. d. slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

The least penetrating form of radiation is