Na siloměr zavěsíme pod sebe závaží s hmotnostmi 50 gramů, 100 gramů a 200 gramů. Jak velkou sílu bude ukazovat siloměr?

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

An owl dives toward the ground with a constant velocity of 4.40 m/s at 53.0° below the horizontal. the sun is directly overhead and casts a shadow of the owl directly below it. what is the speed (in m/s) of its shadow on level ground?

Convection currents are caused by differences in what two things?