A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.250 m/s?
a. 5.00 rev/s b. 7.85 rev/s
c. 1.59 rev/s d. 0.80 rev/s
e. 3.18 rev/s
d
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Fluid Flow: An ideal incompressible fluid flows at 0.252 m/s through a 44-mm diameter cylindrical pipe. The pipe widens to a square cross sectional area that is 5.5 cm on a side. Assume steady flow throughout the system.(a) What is the speed of the fluid through the square section of pipe?(b) What is the flow rate in liters per minute?
What will be an ideal response?
On the celestial sphere, the Sun
A) circles once each year along the path called the ecliptic. B) stays always at the same fixed point among the stars. C) circles daily around the celestial equator. D) is the central object.
An electron traveling toward the north with speed 4.0 × 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal
What is the magnitude of the force that the Earth's magnetic field exerts on the electron? (e = 1.60 × 10-19 C) A) 2.3 × 10-18 N B) 3.2 × 10-18 N C) 2.3 × 10-19 N D) 3.2 × 10-19 N E) 2.3 × 10-20 N
When the current through a resistor is increased by a factor of 4, the power dissipated by it
A) decreases by a factor of 4. B) decreases by a factor of 16. C) increases by a factor of 16. D) increases by a factor of 4. E) remain unchanged.