Explanation

• The correct answer is: Simple machines magnify the force you use.
• This statement is true for many simple machines, such as levers, pulleys, and wheel and axle systems.
• Which are designed to multiply the force you apply, making it easier to lift, move, or apply force to an object.

Explanation

Petroleum, natural gas & coal are called non-renewable energy sources.

The most popular renewable energy sources currently are:

1.      Solar energy

2.      Wind energy

3.      Hydro energy

4.      Tidal energy

5.      Geothermal energy

6.      Biomass energy

Explanation

Electric flux through a surface is defined clearly only for a closed surface.

Gauss’s Law applies to closed surfaces to calculate total flux.

Explanation

The word "transistor" is derived from "transfer" and "resistor".

It signifies the transfer of resistance — specifically, it controls a large output resistance using a small input resistance.

In essence, a transistor transfers a signal from a low-resistance circuit to a high-resistance circuit, acting as an amplifier or switch.

Explanation

Shock absorbers in cars are designed to reduce the amplitude of vibrations (oscillations) after hitting a bump.

This is done by dissipating energy (usually through hydraulic or pneumatic damping).

The motion gradually dies out over time, which is characteristic of a damped oscillation.

Explanation

 Half-life definition:

The half-life of a radioactive substance is the time it takes for half of the atoms in a sample to decay. 

This decay process is inherent to the specific nucleus of the atom, meaning the half-life is a property of the substance itself and is independent of factors like the amount present or how old the sample is. 

Explanation

Soft iron is most suitable for transformer cores due to its high magnetic permeability and low hysteresis loss.

It allows efficient magnetic flux linkage, improving transformer performance.

Explanation

A body is in translational equilibrium when the vector sum of all forces acting on it is zero, meaning ∑F = 0.

This implies the sum of forces in both the x and y directions are also zero, i.e., ∑Fx = 0 and ∑Fy = 0.

The statement ∑τ = 0 is related to rotational equilibrium, not translational equilibrium.

The condition ∑β = 0 is not standard terminology in physics.

Explanation

Step 1: Use projectile motion

The maximum range of a projectile (ignoring air resistance) is given by:

R=v^2sin(2θ)/g​

The maximum range occurs when θ=45∘the value is maximum at (i.e.,sin(90∘)=1).

Step 2: Plug in values

• $v = 12 text{m/s}$

• g=10 m/s^2

R=12^2⋅1 ​/ 10 

= 144/10

​=14.4 meters

Explanation

According to Kirchhoff's law:

Coefficient of emission (e) + Coefficient of reflection (r) + Coefficient of transmission (t) = 1

Given: t = 0.33, r = 0.64

e + 0.64 + 0.33 = 1

e = 1 - 0.97

= 0.03