While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 watts during a race, how fast is the person running? Assume a running step is 1.5 m long.
What will be an ideal response?
2.92 m/s
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Two parallel conductors each of 0.50-m length, separated by 5.0 × 10^-3 m and carrying 3.0 A in the same direction, will experience what type and magnitude of mutual force? (magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A)
a. attractive, 1.8 × 10^-4 N c. repulsive, 0.60 × 10^-4 N b. repulsive, 1.8 × 10^-4 N d. attractive, 0.06 × 10^-4 N
When a 10-N object is suspended at rest by two equally-taut vertical strands of rope, the tension in each strand is
A) less than 5 N. B) 5 N. C) more than 5 N. D) 10 N.
A negative charge, if free, will tend to move
A) from high potential to low potential. B) from low potential to high potential. C) toward infinity. D) away from infinity. E) in the direction of the electric field.
Write out the electron configuration for the ground state of the phosphorus atom, which has 15 electrons
What will be an ideal response?