Explanation

In SHM, total energy (kinetic + potential) remains constant if no external force or damping is present.

Though kinetic and potential energy change with time, their sum stays the same throughout the motion.

Explanation

The galactic bulge is the bright, dense center of a spiral galaxy.

It contains old stars.

It often a supermassive black hole at the core.

Explanation

e/m = 2E/B²r²

The formula is derived by equating the magnetic Lorentz force to the centripetal force and using the kinetic energy gained from the accelerating voltage E.

This formula correctly relates the charge-to-mass ratio of an electron to the magnetic field B, radius of the circular path r, and accelerating voltage E.

Explanation

When a body moves with uniform velocity, its speed and direction remain constant throughout the motion.

In such a case, the average velocity over any time interval is equal to the instantaneous velocity at any moment.

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

According to the pressure flow theory, roots can act as a sink (when storing food) and as a source (when mobilizing stored food).

This dual role depends on the plant’s growth stage and seasonal needs.

Explanation

When a nitrogen nucleus is hit by an alpha particle, it can produce oxygen and a proton.

This was observed in early nuclear reactions, such as Rutherford's experiment.

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

Gastric juice is composed of approximately 90% water, which helps dissolve food and enzymes.

The remaining 10% includes hydrochloric acid, enzymes like pepsin, and mucus.