Explanation

An electric generator converts mechanical energy (like rotation from a turbine) into electrical energy using electromagnetic induction.

The mechanical movement causes a conductor to cut magnetic field lines, generating electric current.

Explanation

Our Sun formed about 4.57 billion years ago from a cloud of gas and dust known as a solar nebula.

This process eventually led to the formation of the entire solar system.

Explanation

Since ΔU = 0 for a cyclic process, Q = W.

The gas absorbs 50 J of energy as heat and does 50 J of work, where Q = W = 50 J.

The best answer is The gas absorbs 50 J of energy as heat and does 50 J of work.

Explanation

There are 5 planets visible without a telescope, Mercury, Venus, Mars, Jupiter and Saturn.

Explanation

• Our universe become born about thirteen.7 billion years in the past in a huge expansion that blew area up like a massive balloon.
• That, in a nutshell, is the big Bang theory, which truly all cosmologists and theoretical physicists suggest.
• The evidence helping the idea is considerable and convincing.
  

Explanation

Fringing reefs are directly attached to a shoreline or lie close to the coast of volcanic islands.

They are the most common type of coral reef and develop in the shallow waters near land.

Explanation

Infrasonic sounds have frequencies below 20 Hz, which are too low for human hearing.

Ultrasonic refers to sounds above 20,000 Hz.

Audible is the range between 20 Hz and 20,000 Hz.

Explanation

The speed at a banked turn is given by:

v = √(rg tan(θ))

Given v = √(rg), we can equate:

√(rg tan(θ)) = √(rg)

This simplifies to:

tan(θ) = 1

θ = arctan(1) = 45°.

Explanation

When Thorium (Th) emits a beta particle (β⁻), a neutron converts into a proton, increasing atomic number by 1.

So Thorium (Z=90) becomes Protactinium (Z=91).

Explanation

• Venus and Mercury are the only planets in the solar system that do not have any natural satellites or moons.
• Likely due to their proximity to the Sun and gravitational influences.