Physics, 19.12.2019 03:31 hannahcolleen4895

Professor goetz took a heavy marine 100 foot, 0.75 lb per foot rope and through it through his office window. one end of the rope touches the ground. professor goetz missed his lunch and can only exert 300kcal (the equivalent of a healthy sandwich). he realized he does not know if he has enough energy to lift the rope back into his office. a) how much energy in kcalories is needed to lift the rope half way from the ground. b) calculate whether he is capable of lifting the rope all the way up. c) a person who eat a candy gains extra 50kcal. if this energy is used to lift the rope, how many feet will it be lifted from the ground.

Answers: 2

Show answers

Another question on Physics

Physics, 22.06.2019 03:30

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.

Answers: 3

Answer

Physics, 22.06.2019 10:30

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Answers: 2

Answer

Physics, 22.06.2019 10:30

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Answers: 2

Answer

Physics, 22.06.2019 16:40

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel

Answers: 3

Answer

You know the right answer?

Professor goetz took a heavy marine 100 foot, 0.75 lb per foot rope and through it through his offic...

Questions