Explanation

Force is defined as the rate of change of linear momentum with respect to time.

According to Newton’s second law, force causes a change in an object’s momentum.

Explanation

Commutative property means the order doesn’t matter: 𝐴 ∗ 𝐵 = 𝐵 ∗ 𝐴.

Union ∪ is commutative, so 𝐴 ∪ 𝐵 = 𝐵 ∪ 𝐴.

Explanation

Gamma rays consist of radiations similar to x-rays.

They are high-energy electromagnetic waves with no mass or charge.

Explanation

The kinetic energy (KE) of an electron in the nth orbit is given by:

KE = 1/2mv²n

Where m is the mass of the electron and vn is its velocity in the nth orbit.

Explanation

Spring potential energy is given by U = 1/2kx².

If stretching to distance S gives 10 J, then to stretch to 2S, the energy becomes 1/2k(2S)² = 4×10 = 40 J.

So, additional work =  40−10 = 30 J.

Explanation

"People" is plural, so the verb must be plural too.

"Were" is the past tense plural form of "to be," matching the sentence context.

Explanation

The force is acting along the y-axis only, so it has no component along the z-axis.

Answer: 0 N

Explanation

Namaz commanded in Quran for 700 times.

Salat made compulsory in the 10th Nabvi.

Salat Juma became Farz in Madina 2H.

***

Explanation

"1st Ashra of Ramadan is "Days of mercy" (Rehmat).

2nd Ashra of Ramadan is "Days of forgiveness" (Maghfirayat).

3rd Ashra of Ramadan is "Days of refuge from hell fire" (Jahanum ke aag sa nijahat).

Explanation

Direct current is produced when electrons flow constantly in one direction.

It's abbreviated as "DC".

Since direct current flows in one direction only, its electrical pressure or voltage is always oriented in one direction, or "polarity".