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
A
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Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
A. 80 N B. 40 N C. 69 N D. 57 N E. 75 N
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion. The net force on the body
a. is zero c. points up b. has its largest magnitude d. points down
The impedance of the parallel RLC circuit shown is given by
A.
B.
C.
D.
E.
Briefly explain how dark matter affects the expansion rate of the universe and the significance of the term critical density in the absence of any mysterious repulsive force
What will be an ideal response?