Gravitation — Physics STD 11 Science — Question

A steel girder can bear a load of 25 tonnes. If the depth of the girdes is doubled, how much load can it bear?

Find the angle of projection at which horizontal range and maximum height are equal.

What are the two basic characteristics of a simple harmonic motion?

In an electric store heat keeps on coming out continously, yet its temperature becomes stable after some time. Why?

Three particles having equal masses are placed at the three corners of an equilateral triangle of side a. Find the moment of inertia of the system relative to the axis passing through any one particle and perpendicular to the plane of the triangle.

A wire forming a loop is dipped into soap solution and taken out so that a film of soap solution is formed. A loop of 6.28cm long thread is gently put on the film and the film is pricked with a needle inside the loop. The thread loop takes the shape of a circle. Find the tension in the thread. Surface tension of soap solution = 0.030N/m.

Answer the following: The mean diameter of a thin brass rod is to be measured by vernier callipers. Why is a set of 100 measurements of the diameter expected to yield a more reliable estimate than a set of 5 measurements only?

If the length of a wire is cut to half then
(i) What would be the effect on its increase in length within the given weight?
(ii) What would be the effect on the maximum weight which it bears?

Out of the four fundamental forces, which force is weakest and which is strongest?