Tissues — Science STD 9 — Question

When will a body under the action of several forces have 0 acceleration? 

The sound waves travel fastest:

1. In solids.
2. In liquids.
3. In gases.
4. In vacuum.

Who was the first scientist which proposed that "Matter is made up of indivisible particles called atoms"?

If a satellite is revolving around a planet of mass M in an elliptical orbit of semi-major axis a, find the orbital speed of the satellite when it is at a distance r from the focus.

A force of 50N is applied on a nail of area 0.001sqcm.Then the thrust on the nail is equal to:

In an auditorium, when a speech is going on, a window is opened beside the audience, then the absorption of sound:

Provides mechanical support and elasticity to young ______________ plants.

Which of the following is true about distance and time.

Multicellular eukaryotes with cell walls come under the group ?