Answer:
Time = 600 seconds
Explanation:
Given the following data;
Power = 60W
Energy = 36000
To find the time;
Energy = power * time
Substituting into the equation, we have;
36000 = 60 * time
Time = 36000/60
Time = 600 seconds.
Therefore, the bulb was on for 600 seconds.
Due to Ohm's law, I is proportional to V and 1/R:
I ∝ V
I ∝ 1/R
R is proportional to the wire length L:
R ∝ L
Therefore I is also proportional to 1/L:
I ∝ 1/L
Calculate the scale factor due to increased voltage:
k₁ = 24/12 = 2
Calculate the scale factor due to decreased wire length:
k₂ = 1/(0.5/1) = 2
Multiply the original current by the scale factors to get the new current:
I = I₀k₁k₂
I₀ = 100mA, k₁ = 2, k₂ = 2
I = 100(2)(2)
I = 400mA
Answer:
the distance of image from the vertex is 45 cm and the image formed is in the glass.
Explanation:
distance of object, u = - infinity
radius of curvature, R = - 15 cm
refractive index, n = 1.5
Let the distance of image is v.
Use the formula
The image is in the glass.
