A battery is attached to several different capacitors connected in series. Which of the following statements is true?
1.All capacitors have the same charge, and the equivalent capacitance is greater than the capacitance of any of the capacitors in the group.
2.The capacitor with the largest capacitance carries the smallest charge.
3.The potential difference across each capacitor is the same, and the equivalent capacitance is greater than any of the capacitors in the group.
4.The capacitor with the smallest capacitance carries the largest charge.
5.The potential differences across the capacitors are the same only if the capacitances are the same.
3,5
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A 1000-kg car approaches an intersection traveling north at 20.0 m/s
A 1200-kg car approaches the same intersection traveling east at 22.0 m/s. The two cars collide at the intersection and lock together. Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision? A) 29.7 m/s in a direction 47.7° east of north B) 21.1 m/s in a direction 47.7° west of south C) 15.1 m/s in a direction 52.8° east of north D) 21.1 m/s in a direction 52.8° east of north E) 21.1 m/s in a direction 47.7° east of north
A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.45 kg and time of contact with the football is 0.035 s, what is the force exerted on the foot?
a. 14 N b. 13 N c. 390 N d. 860 N e. 900 N
A 50-gram sample of dry ice (solid CO2) is placed in a 4-liter container. The system is sealed and allowed to reach room temperature (20°C). By approximately how much does the pressure inside the container increase when the dry ice turns to gas? (Ignore the initial volume of the sample.)
For a fixed control volume, the reason why the equation below is:
(A) The integrand is independent of time
(B) The limits of integration are independent of time
(C) The flow is a steady flow
(D) The quantity ?? is independent of position