A block is pulled across a floor as shown in the vector diagram. The greater component of F is in the
1) horizontal direction,
2) vertical direction,
although both horizontal and vertical components would be of equal magnitude if vector F were
3) horizontal.
4) vertical.
5) at an angle of 45°.
Answer: 2, 5
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A 120-V rms voltage at 1000 Hz is applied to a series RLC circuit with an equal value of inductive and capacitive reactance and a 200-? resistance. What is the impedance of this circuit?
A) 240 ? B) 120 ? C) 100 ? D) 0 ? E) 200 ?
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When a positive charge q is placed in the field created by two other charges Q1 and Q2, each a distance r away from q, the acceleration of q is
A. in the direction of the charge Q1 or Q2 of smaller magnitude. B. in the direction of the charge Q1 or Q2 of greater magnitude. C. in the direction of the negative charge if Q1 and Q2 are of opposite sign. D. in the direction of the positive charge if Q1 and Q2 are of opposite sign. E. in a direction determined by the vector sum of the electric fields of Q1 and Q2.
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. -0.64 kJ b. -0.40 kJ c. -0.52 kJ d. -0.28 kJ e. -0.76 kJ