PLEASE ANSWER NOW
Which of the following describes a way in which the electric force is different from the gravitational force?
A
The electric force is a
contact force.
B
The electric force increases as the
distance between the interacting
objects increases
C
The electric force depends primarily
on the mass of an object.
D
The electric force can be
either attractive or repulsive.

Astring that is fixed at both ends has a length of 1.05 m. when the string vibrates at a frequency of 91.0 hz, a standing wave with five loops is formed. (a) what is the wavelength of the waves that travel on the string? (b) what is the speed of the waves? (c) what is the fundamental frequency of the string?

What is magnetic flux? explain faraday's law of induction.

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.