The size of the electric current in an electrical conductor is a function of which of the following?
a. velocity of charge carriers
b. conductor cross-sectional area
c. density of charge carriers
d. All of the above choices are valid.
d
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Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3
What is the speed of the air when it leaves the nozzle? A) 176 m/s B) 29.3 m/s C) 88.0 m/s D) 35.2 m/s E) 343 m/s
The study of eclipsing binary star systems provides information about the radii of stars.
Answer the following statement true (T) or false (F)
Based on the results from Planck, the overall composition of the universe is
A) 100% ordinary (baryonic) matter. B) 15% ordinary (baryonic) matter, 85% nonbaryonic dark matter. C) 1% ordinary (baryonic) matter, 99% nonbaryonic dark matter. D) 4% ordinary (baryonic) matter, 23% nonbaryonic dark matter, 73% dark energy.
An 1800 kg car traveling at 35.0 m/s strikes a wall. If the car comes to rest in 0.500 seconds, then the average force of the wall on the car is
A. 
B. 
C. 
D. 
E. 