Explanation

If the mass is doubled, both angular and linear momentum will be doubled according to the conservation of momentum principle.

Explanation

If the radius of the Earth is reduced to one-fourth of its original value, the escape velocity will be quadrupled.

Explanation

To calculate the focal length of a lens, you can use the formula: P = 1/f

Given that the power of the lens is 10 diopters, we can rearrange the formula to solve for the focal length:

f= 1/p

f= 1/10

f= 0.1m

Since 1 meter = 100 cm, the focal length in centimeters is 0.1m × 100 cm/m= 10cm.

Explanation

Confining a wave to oscillate in one plane is indeed called polarization.

Explanation

In the relation E = F/q , the charge q is always positive.

Explanation

If a positive charge is placed between two negative charges, the system will be unstable due to the repulsive forces between like charges.

Explanation

If the radius is doubled and the angular velocity remains constant, the tangential acceleration will be unchanged.

Explanation

If the lift is accelerated downward, the apparent weight experienced by an object inside the lift is m(g−a).

Explanation

The velocity required to put a satellite into orbit around the Earth is approximately 7.8 km/s.

Explanation

If the current is into the page and the wire is perpendicular to the page, then the magnetic field will be directed counterclockwise.