Newton's Second Law in 1 Dimension: On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?
A. 2.5 m/s2
B. 2.0 m/s2
C. 1.5 m/s2
D. 1.0 m/s2
Answer: D
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Air 1000°C flows at an inlet velocity of 2 m/s between two parallel flat plates spaced 1 cm apart. Estimate the distance from the entrance to the point where the boundary layers meet.
GIVEN
Air flows between two parallel flat plates
Air velocity (U?) = 2 m/s
Plate spacing (S) = 1 cm = 0.01 m
FIND
The distance from the entrance (xc) where the boundary layers meet
ASSUMPTIONS
Steady flow
Air is dry and at a temperature of 1000°C
SKETCH
Compared to our own Galaxy, elliptical galaxies
A) have bluer stars. B) show more internal structure. C) have no arms, but a better defined disk. D) have more dust. E) show no evidence of ongoing star formation.
A wheel of diameter 0.70 m rolls without slipping. A point at the top of the wheel moves with a tangential speed 2.0 m/s
(a) At what speed is the axis of the wheel moving? (b) What is the angular speed of the wheel?
A radioactive substance with a half-life of 3 days has an initial activity of 0.24 Ci. What is its activity after 6 days?
A) 0.48 Ci B) 0.02 Ci C) 0.06 Ci D) 0.23 Ci E) 0.12 Ci