pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe transporting 30°C water. If a laminar flow exists, the flow rate is nearest:
(A) 0.00195 L/s
(B) 0.00243 L/s
(C) 0.00732 L/s
(D) 0.00991 L/s
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How long will it take a 7.08 hp motor to lift a 250 kg beam directly upward at constant velocity from the ground to a height of 45.0 m? Assume frictional forces are negligible. (1 hp = 746 W)
A) 20.9 s B) 1.56 × 104 s C) 2.18 × 104 s D) 39.7 s
An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall, (a) where is the image formed? (b) how tall is it?
What will be an ideal response?
A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light
It is unstable, and is observed to decay in an average 37.0 ?s. If this particle were at rest in the laboratory, what would be its average lifetime? A) 2.9 µs B) 18 µs C) 5.3 µs D) 12 µs E) 4.3 µs
A proton (mass = 1.67 × 10^-27 kg) has a kinetic energy of 1.00 MeV. If its momentum is measured with an uncertainty of 2.00%, what is the minimum uncertainty in its position? (h = 6.63 × 10^-34 J×s and 1 eV = 1.6 × 10^-19 J)
a. 9.08 × 10^-14 m c. 5.64 × 10^-14 m b. 1.14 × 10^-13 m d. 2.28 × 10^-13 m