Explanation

Multiplying a vector by a negative number (scalar) reverses its direction.

Example: If $\vec{v}$ has direction, then $-k\vec{v}$ (where $k>0$) points opposite to $\vec{v}$.

Explanation

The centimeter (cm) is a metric unit of length or distance. 

It is equal to 0.01 meters.

Explanation

Physics is the branch of science that studies the properties of matter, energy, and their interactions.

It encompasses mechanics, thermodynamics, electromagnetism, and more.

Explanation

Let's determine the number of significant figures in the number 2.3040.

Rules for Significant Figures:

1. All non-zero digits are significant.
2. Zeros between non-zero digits are significant.
3. Leading zeros (zeros before the first non-zero digit) are not significant.
4. Trailing zeros (zeros after the last non-zero digit) are significant if there is a decimal point.

Now, analyze 2.3040:

• The digits 2, 3, and 4 are non-zero and significant.
• The zero 0 between 3 and 4 is a trapped zero, so it is significant.
• The last zero 0 is a trailing zero and there is a decimal point, so it is significant.

So, the significant digits are: 2, 3, 0, 4, 0 → that's 5 significant figures.

Explanation

1 radian ≈ 57.3 degrees, based on the formula: 

1 radian = 180/𝜋 degrees.

It is a standard angular measurement in mathematics and physics.

Explanation

• Michael Faraday is known as the Father of Electricity.
• He discovered the laws of electromagnetism.
• He also built the first electric generator and first electric motor.

Person	Known as the Father of
Theophrastus	Botany
Galileo Galilei	Modern Physics
Alexander Graham Bell	Telephone
Michael Faraday	Electricity

Explanation

Coal is the most common fuel used worldwide for electricity generation.

It provides a large share of power due to its availability and low cost.

Explanation

Sunlight is mainly produced by nuclear fusion of hydrogen into helium in the Sun’s core.

This process releases huge amounts of energy in the form of light and heat.

Explanation

Explanation

According to Coulomb’s Law, force is inversely proportional to the square of distance: F∝ 1/r².

So, if distance is doubled, force becomes 1/(2)² = 1/2.