What enables the ear pinna to be folded and twisted while the nose tip can't be twisted?

Small intestine in very long and coiled. Even if we jump and run, why it does not get twisted? What can happen of it gets twisted?

Answer the following questions:Make two sufficiently long, identical tubes out of a cardboard. Arrange them on a table, in front of a wall as shown in figure . Place a clock near the end of one of the tubes and try to hear the ticking of the clock at the end of the other tube by placing your ear there. Adjust the angles of the two tubes till you can hear the sound very clearly Measure the angle of incidence theta_1 and the angle of reflection theta_2 . Try to see if they are related in any way. In the experiment, what will happen if you lift one of the tubes to some height?

Try this. Draw a cage on one side of a cardboard' and a bird on the other side. Hang the cardboard with the help of a thread. Twist the thread and leave it. What do you see and why?

A coil cosists of 400 turns of wire. Each turn is a square of side d= 20 cm. A uniform magnetic field directed perpendicular to the plane of the coil is turned on. If the field changes linearly from 0 to 0.50 T in 0.8 s, what is the magnitude of induced emf in the coil while is the field is changing?

Shreyas choked while eating dinner. How can you help him? What is the immediate help that can be give to him?

Intext Question. Take two convex lenses of different sizes. Collect sunlight on a paper using one of the lenses. The paper will start burning after a while. Note the time required for the paper to start burning. Repeat the process for the second lens. Is the time required the same in both cases? What can you tell from this?

A rod of mass M and length l is suspended freely from its end and it can oscillate in the vertical plane about the point of suspension. It is pulled to one side and then released. It passes through the equilibrium position with angular speed omega . What is the kinetic energy while passing through the mean position?

One end of a massless rope, which passes over a massless and frictionless pulley P is tied to a hook C while the other end is free. Maximum tension that the rope can bear is 360 N. With what value of minimum safe accleration with value of minimum safe acceleration (in "m s"^(-2) ) can a monkey of 60 kg move down on the rope?

A winding wire which is used to prepare a solenoid of length 80 cm can bear a maximum cuurent of 10 A. the cross-sectional radius of the solenoid is 3 cm. what should be the length of the winding wire if a magnetiic field of 0.2 T is to be produced at the centre of the solenoid along its axis?