State how the centripetal force is provided in the following examples:
a) a planet orbiting the Sun,
b) a child on a playground roundabout,
c) a train on a curved track,
d) a passenger in a car going round a corner.​

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

How can you increase the strength of an electromagnet?

Which scientist was the first to propose the heliocentric model of the universe? a. aristotle b. isaac newton c. galileo galilei d. nicolaus copernicus