What mechanism is most responsible for generating the internal heat of Io that drives the volcanic activity?
A) accretion
B) radioactive decay
C) differentiation
D) tidal heating
E) bombardment
D
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The acceleration of a rocket increases as it travels upward from the ground mainly because
A) gravity becomes weaker with increased distance. B) the applied force on the rocket increases as fuel is burned. C) the mass of the rocket decreases as fuel is burned.
Conservation of Momentum: The momentum of an isolated system is conserved
A. only in inelastic collisions. B. only in elastic collisions. C. in both elastic and inelastic collisions.
A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:
(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm
Determine the temperature distribution and heat flow rate per meter length in a long concrete block having the shape shown below. The cross-sectional area of the block is square and the hole is centered.
GIVEN
A long concrete block having the shape shown below
The cross-sectional area of the block is square
The hole is centered
FIND
(a) The temperature distribution in the block
(b) The heat flow rate per meter length
ASSUMPTIONS
The heat flow is two dimensional and in steady state
The thermal conductivity in the block is uniform
SKETCH
