Fthe resistance remains constant and the voltage doubles, what effect will that have on the power?   a. the power will remain the same. b. the power will decrease by a factor of 2. c. the power will decrease by a factor of 4. d. the power will increase by a factor of 2. e. the power will increase by a factor of 4

The power will increase by a factor of 4

E is correct.

Explanation:

Given that,

The power of the circuit in form of voltage

If the resistance remains constant then

using this equation we will compare P and V

Where,

Now, we substitute the value into formula  and we get

Hence, The power will increase by a factor of 4

im guessing the west of station b

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s