A 15-?F capacitor and a 25-?F capacitor are connected in parallel, and charged to a potential difference of 60 V. How much energy is then stored in this capacitor combination?
a. 50 mJ
b. 18 mJ
c. 32 mJ
d. 72 mJ
e. 45 mJ
d
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In metabolic pathways that are regulated by feedback inhibition, the _____ inhibits the activity of the _____
a. product; first enzyme b. first enzyme; product c. second enzyme; first enzyme d. last enzyme; first enzyme e. reactant; product
A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg?m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg?m2, what is the final angular speed?
A) 2.25 rad/s B) 4.60 rad/s C) 6.25 rad/s D) 1.76 rad/s E) 0.81 rad/s
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 53° above the horizontal. The weight of the ladder is 30 pounds. A 75-lb boy climbs 6.0-ft up the ladder. What is the magnitude of the friction force exerted on the ladder by the floor?
a. 43 lb b. 34 lb c. 38 lb d. 47 lb e. 24 lb
A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm. The capacitor is connected across a 9.0-V potential source. (?0 = 8.85 × 10-12 C2/N • m2)
(a) What is the magnitude of the electric field between the plates? (b) What is the capacitance of the capacitor? (c) What is the magnitude of the charge on each plate of the capacitor?