Calculate the speed of sound in air when the temperature of the air is -15 Celsius (I know the answer but I just don’t know how to get it.)

In a vernier instrument the main scale is in 1/2 mm divisions .vernier is made by redividing 19 such divisions into 20 equal parts. calculate the least count of the instrument.

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.

If you put a helium-filled balloon in the refrigerator, what will happen?