a toy/model steam engine. how it works and how to measure horse power
Answer : Option B) Perfect Circles
Explanation : In heliocentric model where sun is considered to be the center and earth and other planets revolves around it. The shape of the objects in the space is perfectly circle as they move around the sun.
Answer:
47,040 J
Explanation:
GPE= ham
GPE= (60)(9.8)(80)
GPE= 47,040 J
The largest transition metal is copernicium with 112 protons.
Answer:
Q total = 2204.49 kJ
Explanation:
The mass of ice over the windshield is
mass = density * volume
and
volume = area * width= 1 m² * 0.007 m = 0.007 m³
thus
mass = 917 kg/m³ * 0.007 m³ = 6.419 kg
the heat that must reach the ice in order to melt it is
1) sensible heat until melting temperature ( T m = 0°C , assuming that pressure =1 atm since the windshield is exposed to the atmosphere)
2) Latent heat to melt the ice at its melting temperature
1) Q sen = m ice * c ice * ( T final - T initial) = 6.419 kg * 2.108 kJ / Kg °C ( 0°C - (-4°C)) = 54.125 kJ
2) Q lat = m ice * L ice = 6.419 kg * 335 kJ/kg ) = 2150.265 kJ
therefore Q total = Q sen + Q lat = 54.125 kJ + 2150.265 kJ = 2204.49 kJ
this is the minimum amount of heat required , since we did not take into account the heat losses to the surroundings
Note :
- the specific heat of water and ice and also the latent heat were taken from tables.