PART - 2 CH - 13 Oscillations — Physics STD 11 Science — Question

A circular road of radius 50m has the angle of banking equal to 30°. At what speed should a vehicle go on this road so that the friction is not used?

The velocity of a particle is v = 5 + 2 (a₁ + a₂t) where a₁ and _a2 are constants and t is the time. What is the acceleration of the particle?

The audible frequency range of a human ear is 20Hz-20kHz. Convert this into the corresponding wavelength range. Take the speed of sound in air at ordinary temperature to be 340m/s.

How many metric tons are there in teragram?

A monkey climbs up a slippery pole for 3 seconds and subsequently slips for 3 seconds. Its velocity at time t is given by v(t) = 2t(3 - t); 0 < t < 3 and v(t) = -(t - 3)(6 - t) for 3 < t < 6s in m/s. It repeats this cycle till it reaches the height of 20m.
At what time is its average velocity maximum?

An unruly demonstrator lifts a stone of mass 200g from the ground and throws it at his opponent. At the time of projection, the stone is 150cm above the ground and has a speed of 3.00m/s. Calculate the work done by the demonstrator during the process. If it takes one second for the demonstrator to lift the stone and throw, what horsepower does he use?

A boy is standing on a platform which is free to rotate about its axis. The boy holds an open umbrella in his hand. The axis of the umbrella coincides with that of the platform. The moment of inertia of ''the platform plus the boy system'' is 3.0 × 10^-3kg-m² and that of the umbrella is 2.0 × 10³kg-m². The boy starts spinning the umbrella about the axis at an angular speed of 2.0rev/s with respect to himself. Find the angular velocity imparted to the platform.

A nearsighted person cannot clearly see beyond 200cm. Find the power of the lens needed to see objects at large distances.

An iron needle is attracted to the ends of a bar magnet but not to the middle region of the magnet. Is the material making up the ends of a bar magnet different from that of the middle region?