Embibe Experts Solutions for Chapter: Newton's Law of Motion, Exercise 2: Exercise 2

A block of mass $M$ is at rest on a plane surface inclined at an angle $\theta$ to the horizontal. The magnitude of the force exerted by the plane on the block is:

A spring balance A reads $2 \mathrm{kg}$ when a block of mass $m$ suspended from it. Another balance$B$reads$3 \mathrm{kg}$ when a beaker with a liquid is put on its pan. The two balances are now so arranged that the hanging mass $m$ is fully immersed inside the liquid in the beaker as shown in the figure. In this situation. 

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 $\left(\overrightarrow{F}\right)$ which is obliquely upward as shown. Then

A box, when hung from a spring balance shows a reading of $50 \mathrm{kg}$. If the same box is hung from the same spring balance inside an evacuated chamber, the reading on the scale will be 

In an experiment, setup $A$ consists of two parallel wires which carry currents in opposite directions as shown in the figure. A second setup $B$ is identical to setup $A$, except that there is a metal plate between the wires.

Let $F_A$ and $F_B$ be the magnitude of the force between the two wires in setup $A$ and setup $B$, respectively.

Consider two masses with $m_1>m_2$ connected by a light inextensible string that passes over a pulley of radius $R$ and moment of inertia $I$ about its axis of rotation. The string does not slip on the pulley and the pulley turns without friction. The two masses are released from rest separated by a vertical distance $2h$. When the two masses pass each other, the speed of the masses is proportional to.

In Guericke's experiment to show the effect of atmospheric pressure, two copper hemispheres were tightly fitted to each other to form a hollow sphere and the air from the sphere was pumped out to create vacuum inside. If the radius of each hemisphere is $R$ and the atmospheric pressure is $P$, then the minimum force required (when the two hemispheres are pulled apart by the same force) to separate the hemispheres is

A box filled with water has a small hole on its side near the bottom. It is dropped from the top of a tower, As it falls, a camera attached on the side of the box records the shape of the water stream coming out of the hole. The resulting video will show