Question

Asked Sep 25, 2019

26 views

24.45 Electronic flash units for cameras contain a capacitor for storing the energy used to produce the flash. In one such unit, the flash lasts for 1/675 s with an average light power output of 2.70 x 10⁵ W. (a) If the conversion of electrical energy to light is 95% efficient (the rest of the energy goes to thermal energy), how much energy must be stored in the capacitor for one flash? (b) The capacitor has a potential difference between its plates of 125 V when the stored energy equals the value calculated in part (a). What is the capacitance?

HINTS: Part (a) is about Physics 1. Energy = Power x Time, so U = 95% of 2.7E+05 x (1/675). Then one can use U = CV^{2} / 2 for part (b).

Step 1

a)

The relation between Energy and Power is given as,

Step 2

Here *E *is the energy stored in the flash, *P* is the average light power output and *t *is the time for

which the flash lasts.

Substituting the 2.7 x 10^{5} W for *P*, 1/675 for *t* and solve for *E *as,

Step 3

The effective electrical energy *U *that is c...

Tagged in

Q: As a city planner, you receive complaints from local residents about the safety of nearby roads and ...

A: Using law of conservation of energy,

Q: How do several motions that are represented by x(t) lines with various slopes differ from each other...

A: Let x(t) be a straight line with a slope. The general form of straight line passing through the orig...

Q: A block of mass m1 is placed on top of a block of mass m2. You push the two blocks so that they move...

A: Free body diagram of the mass m2 is shown below.

Q: How does the diameter of the Sun compare with the diameter of the Moon’s orbit around the Earth?

A: The diameter of the Moon’s orbit around the Earth is, 769000km.The diameter of the sun’s orbit is 13...

Q: The sled dog in figure drags sleds A and B across the snow. The coefficient of friction between the ...

A: Frictional force on slide A is,

Q: A +6.00uC charge and a -3.00 uC are located at 2 vertices of an equilateral triangle 10.0cm on the s...

A: Calculating electric at top vertex due to both the charges:

Q: In the figure particles 2 and 4, of charge –e, are fixed in place on a y axis, at y2 = -9.42 cm and ...

A: (a) In the initial configuration, the force experienced by the charge particle 5 due to charge parti...

Q: Can you please do number 4? Thank you.

A: Click to see the answer

Q: * 16. In the most bizarre wildlife documentary ever made, Animal Kingdom has filmed a rainbow trout ...

A: GivenInitial velocity of the fish u = 35 m/sProjectile angle θ = 37otime of flight t = 3 s