What distinguishes a derived unit from a base unit?
What will be an ideal response?
A derived unit can be expressed in terms of a combination of base units.
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A proton (mass = 1.67 × 10^?27 kg, charge = 1.60 × 10^?19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB ? VA
a. +15 V b. ?15 V c. ?33 V d. +33 V e. ?20 V
Power: For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?
A. 1/(resistance) B. resistance C. potential D. (potential)2 E. 1/(potential)
When you blow some air above a paper strip, the paper rises. This happens because
A) the air above the paper moves slower and the pressure is higher. B) the air above the paper moves faster and the pressure is lower. C) the air above the paper moves faster and the pressure is higher. D) the air above the paper moves slower and the pressure is lower. E) the air above the paper moves faster and the pressure remains constant.
According to Archimedes’ principle, the buoyant force
A. is equal to the mass of the object B. is always greater than the weight of the object C. is equal to the weight of the displaced fluid D. is less than the weight of the displaced fluid if the object sinks