Determine the potential difference Va ? Vb shown in the circuit below
a.
?5.0 V
b.
+5.0 V
c.
?10 V
d.
+10 V
e.
0 V
b
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A 1.0-kg object is moving with a constant velocity 2.0 m/s toward the north. There are two forces acting on the object. One of the forces is 3.0 N north. What is the second force that acts on the object?
A) 1.0 N north. B) 3.0 N north. C) 3.0 N south. D) 2.0 N north. E) 0.
In this figure a time sequence shows one complete cycle for the vibration of an object on a spring. How would the equilibrium position of the object change if its mass were increased?
a. It would go up. b. It would go down. c. It would remain the same.
Power: The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
A. The power is still 2.0 kW. B. The power increases to 2.2 kW. C. The power decreases to 1.8 kW. D. None of the given answers is correct.
In nuclear fusion, energy is produced because:
a) Hydrogen is not stable. b) the mass of the reacting chemicals is larger than that of the products. c) of the energetic impact of collisions. d) gravity leads to collapse. e) positrons are produced.