Newton's Second Law in 1 Dimension: A 1200-kg car is pulling a 500-kg trailer along level ground. Friction of the road on the trailer is negligible. The car accelerates with an acceleration of 1.3 m/s2. What is the force exerted by the car on the trailer?
A. 550 N
B. 600 N
C. 650 N
D. 700 N
E. 750 N
Answer: C
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The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. These data were obtained by measuring __________.
Fill in the blank(s) with the appropriate word(s).
What observations suggest the mass of the Galaxy goes much farther out than its visible disc?
A) the rotation curve of the outermost portions of the disc B) 21-cm maps of the spiral arms C) infrared observations of distant brown dwarfs D) the orbits of the open clusters in the disc E) X-ray images of other galaxies' discs from Chandra
A very thin silicon chip is bonded to a 6-mm thick aluminum substrate by a 0.02-mm thick epoxy glue. Both surfaces of this chip-aluminum system are cooled by air at 250C, where the convective heat transfer coefficient of air flow is 100 W/(m2 K). If the heat dissipation per unit area from the chip is 104 W/m2 under steady state condition, draw the thermal circuit for the system and determine the operating temperature of the chip.
GIVEN
Silicon chip bonded to 6-mm thick aluminum substrate bye 0.02-mm thick epoxy glue
Air temperature(T?)=250C
Convective heat transfer coefficient(h?)=100 W/(m2 K)
Heat dissipation from chip(q/A)= 104 W/m2
FIND
Draw thermal circuit of system
Operating temperature of the chip.
ASSUMPTIONS
1-Dimensional Steady state conditions prevail
Negligible heat loss from the sides
Isothermal chip
Negliglble radiation
SKETCH
How does the greenhouse effect affect Earth?
What will be an ideal response?