In the theory of relativity, the mass of a particle with velocity v is , where m₀ is the mass of the particle at rest and c is the speed of light. what happens as v → c⁻?
a. m → m₀
b. m → 1
c. m → 0
d. m → m⁻

The mass would tend to infinite.

v→c ⇒ m→∞

Explanation:

We can calculate the following limit easily:

So,

.

This means that mass will only increase as velocity approaches light velocity . It also means that a particle would need infinite energy to travel at light speed.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27