The uncertainty in the position of a proton is 0.053 nm. What is the uncertainty in its speed?
A) 2.2 m/s
B) 0.60 km/s
C) 0.98 km/s
D) 37. m/s
E) 1.2 km/s
E
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Three charges are placed as follows along the x- and y-axis of an xy-coordinate system: q1 = 2.00 ?C at x1 = 0 m, q2 = -4.00 ?C at x2 = 3.00 m, and q3 = 6.00 ?C at y = 4.00 m. What is the electric potential energy of this system of charges?
A) -40.2 mJ B) 40.2 mJ C) -94.2 mJ D) 94.2 mJ E) 0 J
Five moles of an ideal gas expands isothermally at 100°C to five times its initial volume. Find the heat flow into the system
a. 2.5 × 10^4 J b. 1.1 × 10^4 J c. 6.7 × 10^3 J d. 2.9 × 10^3 J e. 7.0 × 10^2 J
A 1200 W hair dryer used for 10 minutes uses as much energy as a 1000 W hair dryer run 12 minutes
What will be an ideal response?
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z is neutral (has no net charge.) e. Y is negatively charged or neutral (has no net charge.)