Forces and Laws...

A body is at rest on the surface of the earth. Which of the following statements is correct?

What force is required to produce an acceleration of $$3 {m}/{{s}^{2}}$$ in an object of mass $$0.7 kg$$?

A Gardner waters the plants by a pipe of diameter $$1\ mm$$. The water comes out at the rate or $$10\ cm^{3}/sec$$. The reaction force exerted on the hand of the Gardner is:

A rocket of mass 1000 kg is to be projected vertically upwards. The gases are exhausted vertically downwards with velocity $$100\, ms ^{-1}$$ with respect to the rocket. What is the minimum rate of burning of fuel, so as to just lift the rocket upwards against, the gravitational attraction? (Take $$g= 10\, ms^{-2} $$) :

A ship of mass $$3 \times 10^7$$ kg, initially at rest, is pulled by a force of $$5 \times 10^4 N$$ through a distance of 3 m. Assuming that the resistance due to water is negligible, the speed of the ship is

A rider on horse falls back when horse starts running all of a sudden because

Two small spheres of masses $${M}_{1}$$ and $${M}_{2}$$ are suspended by weightless insulating threads of lengths $${L}_{1}$$ and $${L}_{2}$$, the spheres carry charges $${Q}_{1}$$ and $${Q}_{2}$$ respectively. The spheres are suspended such that they are in level with another and the threads are inclined to the vertical at angles of $${\theta}_{1}$$ and $${\theta}_{2}$$ as shown, which one of the following conditions is essential, if $${ \theta  }_{ 1 }={ \theta  }_{ 2 }:$$

A free-floating astronaut A pushes another free-floating astronaut B in space. The mass of A is greater than that of B. The force exerted by the astronaut A on the astronaut B will be.

A small child tries to move a large rubber toy placed on the ground. The toy does not move but gets deformed under her pushing force $$\left( { F }  \right) $$ which is obliquely upward as shown. Then

Which of the following is not the characteristics of matter?