A sand mover at a quarry lifts 2,000 kg of sand per minute a vertical distance of 12 meters. The sand is initially at rest and is discharged at the top of the sand mover with speed 5 m/s into a loading chute
At what minimum rate must power be supplied to this machine? A) 524 w
B) 3.92 kw
C) 6.65 kw
D) 4.34 kw
E) 1.13 kw
D
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Except for hydrogen and most of the helium, all the elements have been formed through stellar nucleosynthesis
Indicate whether the statement is true or false
A(n) ______________ is an elementary particle with a charge of –1.6 × 10^-19 C
a. electron b. neutron c. proton d. atom
A proton is moving at a speed of 3.2 × 106 m/s at an angle of 80° to a uniform magnetic field of strength 1.5 × 10-4 T
What is the distance moved by the proton along the spiral path as it completes one revolution? (This distance is called the "pitch" of the helix.) A) 1370 m B) 1390 m C) 240 m D) 220 m E) cannot be determined
What is the temperature of 3.0 moles of gas at a pressure of 250 kPa held in a volume of 15 L?
A) 150 K B) 200 K C) 250 K D) 300 K E) 350 K