Which force can act over distances comparable to the distance between planets?
a. only electrical
c. only magnetic
b. only gravitational
d. All of these choices.
D
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If R1 < R2 < R3, and if these resistors are connected in series in a circuit, which one dissipates the greatest power?
a. R1 c. R2 b. R3 d. All are equal in power dissipation.
Simple Harmonic Motion: The position of an object that is oscillating on an ideal spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. Write an expression for the acceleration of the particle as a function of time using the cosine function.
What will be an ideal response?
High-voltage wires in power lines are not high-current wires because the current in them is
A) not the same as the current that powers the distant load. B) proportional to the voltage drop from beginning to end of each line, rather low. C) both of these D) neither of these
In a hydrogen atom, a given electron has ? = 7. How many values can m? have?
A) 6 B) 7 C) 15 D) 33 E) 98