Explanation

Given kinetic energy (K.E) = 1 J and mass (m) = 1 kg:

K.E = ½mv²

1 = ½ * 1 * v²

v² = 2

v = √2 ≈ 1.414

The correct answer is 1.4 m s⁻¹.

Explanation

The human body has around 600 muscles that help in movement, posture, and vital functions.

These include skeletal, smooth, and cardiac muscles.

Explanation

"Expand on" means to provide more details or explanation about something.

It fits contextually as you're asking someone to elaborate on their ideas.

Explanation

"Honour" fits the context of a polite or respectful request, implying it would be a privilege to dine together.

Honour means اعزاز

Explanation

To convert a percentage to decimal, divide by 100: 40 ÷ 100 = 0.4.

Explanation

Sonorous materials produce a ringing sound when struck.

Metals are sonorous due to their ability to vibrate and transmit sound.

Explanation

Let's calculate the total work hours:

195 men * 10 hours/day * 20 days = 39,000 man-hours

To finish the job in 15 days working 13 hours/day:

Let x be the number of men needed:

x men * 13 hours/day * 15 days = 39,000 man-hours

195 * 10 * 20 = x * 13 * 15

39,000 = 195x

x = 39,000 / 195

x = 200

The number of men is 200.

Explanation

The correct phrase is "We should not swim after a meal" as it's advised to wait before swimming.

"After" indicates the time following an event.

Explanation

• The asteroid belt is a region of space where many small rocky bodies, called asteroids, orbit the Sun.
• It's also known as planetoids or minor planets.
• It is located between the orbits of Mars and Jupiter, spanning from about 2.2 to 3.2 astronomical units (AU) from the Sun.

Explanation

Vertical columns in the periodic table are called groups.

Horizontal rows are called periods.