Paczka o masie 5kg znajduje się na 7 piętrze, czyli 21 metrów od poziomu zerowego. Oblicz: a) energię potencjalną paczki na 7 piętrze. Podaj wartość energii całkowitej paczki (2pkt)

b) energię potencjalną paczki na 4 piętrze, czyli 12 metrów nad poziomem zerowym (1pkt)

c) energię kinetyczną paczki na 4 piętrze. (1pkt)

d) energię potencjalną i kinetyczną na wysokości 3 metrów na poziomem zerowym (2pkt)

Which seasons are the northern and southern hemispheres experiencing in the image? it is summer in both the northern and southern hemispheres. it is summer in the northern hemisphere and winter in the southern hemisphere. it is winter in both the northern and southern hemispheres. it is winter in the northern hemisphere and summer in the southern hemisphere.

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)