Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies
Indicate whether the statement is true or false
FALSE
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An unfueled 1000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". The rocket moves at 160 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 0.80 × 10^4 N b. 0.75 × 10^4 N c. 0.60 × 10^4 N d. 0.35 × 10^4 N
Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the speed of the water greater?
A) point A B) point B C) same at both A and B D) Cannot be determined from the information given.
At Chernobyl, one of the harmful radioactive isotopes was 131I, a beta emitter with a halflife of 8 days. The mass number of the nucleus that remains after this isotope decays is
A) 132. B) 129. C) 131. D) 127. E) 130.
A Venturi tube may be used as the inlet to an automobile carburetor. If the inlet pipe of 2.0-cm diameter narrows to 1.0-cm diameter, what is the pressure drop in the constricted section for airflow of 4.0 m/s in the 2-cm section? (Assume air density is 1.25 kg/m3.)
a. 70 Pa c. 100 Pa b. 84 Pa d. 150 Pa