Recent content by exec

Homework Statement ==================== <---- aluminium plate ⁣⁣⁣⁣⁣⁢⁢⁢⁠⁡⁡⁢⁢⁢...O .....O... <---- heat coil(O) Given an aluminium plate put on 2 heating coil(O), assuming no heat loss, how much is the heat transfer rate from the coil to the plate? Put the power of each coil as W...

Homework Statement An experiment is carried out to study the rate of cooling with an apparatus consisting of a water-filled beaker sealed with a two-hole stopper with one thermometer and one stirrer. The beaker is put on a wooden liner. State two precautionary steps to be taken so that the...

Homework Statement Consider a closed circuit containing a cell and nothing else. If we assume that the wire contributes no resistance, and there is no internal resistance in the cell. Would there be current flowing in the wire? It's like if you're putting an ammeter in the middle of the...

When I first study the chapter Charge, I was told that charges are quantized, that is, you can't find a charge of like 6.2e or 1/3e. But later, when I got into the quantum theory, I was told that there are quarks, which have charges like +2/3e or -1/3e. Don't these two statements...

When we study physics or chemistry, we often see particles, atoms, neutrons, protons, electrons, etc being portrayed as little spheres. But in fact, how do we know if they are spherical?

When velocity does not vary linearly with time, acceleration is not constant, which means, those equations which hold only when acceleration is constant cannot be used. In this case, velocity varies with the square of time, plotting a graph of velocity versus time shows that the graph is a...

Using your solution, you've got a wrong answer? r^2 = (3.84E5)^5?

Equal number of moles of gas occupies the same volume. As in at stp, one mole of any gas occupies a volume of 22.4dm3.

It depends not only on the relative speed of source to an observer(or relative speed of observer to a source), but also on the relative speed of each of the source and observer to the medium(eg air).

There shouldn't be problems, as long as the rope is assumed to be wrapped on the rim of the cylinder throughout the whole process.

Suppose the radius of curvature of the lens(plano-convex, I studied that before, couldn't quite remember) = R, and the incident light is directed towards the lens upright. We're now concerned with the radii of circular inteference,r. As you've said, we're concerned with the phase change(180)...

Real image of the first lens becomes the virtual object to the second lens, vice versa. f = 16.0cm , o=20.0cm. The resulting image of the first lens = V/R? Treat the real image of the first lens as the virtual object(o = negative) for the second lens. Treat the virtual image of the first lens...