Suppose you launch two probes in opposite directions from the Space Station and they meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through spacetime, and those paths curve so that the probes meet.
B) They are following the allowed orbits according to Newton's universal law of gravitation.
C) The force of gravity tugs on the probes and forces them to orbit the Earth.
D) Objects launched in space always follow circular paths, no matter where they are.
A) They are following the straightest possible paths through spacetime, and those paths curve so that the probes meet.
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A heat exchanger wall consists of a copper plate 2 cm thick. The heat transfer coefficients on the two sides of the plate are 2700 and 7000 W/( m2 K), corresponding to fluid temperatures of 92 and 32°C, respectively. Assuming that the thermal conductivity of the wall is 375 W/ ( m K), (a) compute the surface temperatures in °C, and (b) calculate the heat flux in W/ m2.
GIVEN
• Heat exchanger wall, thickness (L) = 2 cm = 0.02 m
• Heat transfer coefficients
? hc1 = 2700 W/(m2 K)
? hc2 = 7000 W/(m2 K)
• Fluid temperatures
? Tf1 = 92°C
? Tf2 = 32°C
• Thermal conductivity of the wall (k) = 375 W/( m K) FIND (a) Surface temperatures (Tw1, Tw1) in °F (b) The heat flux (q/A) in W/m2. ASSUMPTIONS
• One dimensional heat transfer prevails
• The system has reached steady state
• Radiative heat transfer is negligible
SKETCH
The dynamo effect is believed to produce the ____________________ of the Sun
Fill in the blank(s) with correct word
The electron gun in a television tube accelerates electrons (mass = 9.11 × 10?31 kg, charge = 1.60 × 10?19 C) from rest to 3.00 × 107 m/s within a distance of 2.00 cm. What electric field is required?
What will be an ideal response?
A heat engine has an efficiency of 31.4% and receives 8.72 kJ of heat per cycle
(a) How much work does it perform in each cycle? (b) How much heat does it exhaust in each cycle? What will be an ideal response?