
30 Two point charges q and q are separated by a distance a. At a point a/3 from q and along the line joining the two charges the potential is zero. (Assume the potential is zero very far from all charges.) (a) Which of the following statements is true?

Which of the systems below has the most potential energy stored in its spring(s), relative to the relaxed position?

The week of the exam my father, who is also a professor and was visiting UMass on sabbatical, and I went to Target and WalMart to purchase as many clipboards as they had. The students managed the best they could and persevered. I think we owe it to our students to provide physical surroundings...

1 Throwing a 3 kg hand grenade off a platform 40 m off the ground, with vx = 10m/s. Two seconds later a 2 kg piece hits the ground 10 m from the base of the platform. Where is the 1 kg piece at that time? Remember that Momentum is a Vector! A car (m=1000kg, v =40m/s) collides at right angles...

C. starts out as bright as it was at t1, then dims and goes out. D. glows with constant brightness. E. glows much more faintly than at t1, then goes out. How does the bulb affect how long it takes to charge the capacitor? Change the bulb to a different type. Why does it affect how long it...

2. (a) A voltage source produces a voltage V when its terminals are disconnected (open circuit). When a device that draws a current I is connected across its terminals, the voltage decreases to V V . What is the internal resistance? (b) A current source produces a current of I when a wire...

15. A circuit consists of an inductor (inductance L) connected directly to a 120 V, 60 Hz wall receptacle. What is the smallest L you could use and avoid blowing the 20 A fuse? A similar circuit consists of a capacitor connected directly to a wall receptacle. What is the largest C you could...

If you estimate 0 ~ 1011, what is the area of the plates to have a 1.0 Farad capacitance? A bank of three capacitors (C1, C2, C3) is connected as follows. C2=1 F What is the effective total capacitance of the bank? A light bulb is attached to a battery with constant voltage V. The light...

For Newton, the time interval between two physical events dt is also absolute, or as he put it absolute and mathematical time, of itself, and from its own nature, flows equably without relation to anything external, and by another name is called duration. That remains the same with respect to...

For example, we will learn later in the course that the electrons in metals can have substantial motion (a tenth the speed of light) at absolute zero. An important insight you will learn from this course is that entropy is a deeper and more important concept than temperature and it is through...
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 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
1. Can you show me step by step how to solve this problem?:
 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?