A venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (r = 1.2 kg/m3.)
a. 70 Pa
b. 85 Pa
c. 100 Pa
d. 120 Pa
e. 81 Pa
E
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Stars of type ________ should last about ten billion years on the main sequence
Fill in the blank(s) with correct word
Calculate the reaction energy (Q value) for the reaction 7Li + 1H ? 4He + 4He, given the following masses:
7Li: 7.016005 u 1H: 1.007825 u 4He: 4.002603 u (1 u = 931.5 MeV/c2) A) 15.37 MeV B) 17.35 MeV C) 17.53 MeV D) 13.57 MeV E) 13.35 MeV
What is this object?
A) Ice particles and water vapor are spraying out from the surface. B) A comet is impacting the surface. C) Pebble-size particles from Saturn's rings are raining down onto the surface. D) Sunlight is reflecting off clouds in Enceladus's atmosphere.
Daisy raises 10.Kg to a height of 2.5 meters in 2.0 seconds. (a) How much work did she do? (b) How much power was expended? (c) If she raises it in 1.0 s rather than 2.0 s, how do the work and power change?
What will be an ideal response?