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Electronic flash units for cameras contain a capacitor for storing the energy used to produce a flash. In one such unit the flash lasts for 0.00129 s with an average light power output of 1,657 W. If the conversion of electrical energy to light is 95% efficient (the rest of the energy goes to thermal energy), what is the capacitance? Assume the camera batteries can create a potential difference of 12 V between the capacitor plates. (answer in F.)
For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. determine the recoil velocity
A solution has a hydronium-ion concentration of 1.0 x 10-5 mol per liter. What is the hydroxide-ion concentration of this solution
A parallel plate capacitor with a plate area of 30.0 cm2 and air in the space between the plates, which are separated by 1.7 mm, is connected to a 18.0-V battery. If the plates are pulled back so that the separation increases to 5.1 mm, how much work..
The period of a pendulum is proportional to the square root of its length. A 2.5 m long pendulum has a period of 3.0s
A series circuit has a peak voltage of 114 and a peak current of 3 . If the current lags the voltage by 42 , what is the average power of the circuit?
You are driving a car which is heading 25 m/s towards a brick wall. You sound a horn which emits at a frequency of 500 Hz when at rest. What is the beat frequency that you hear
A long solenoid has 231 turns in a length of 13 cm, radius of 1.8 cm, and I= 1.3 A. Find the magnitude of the average induced emf in the coil
On a highly polished, essentially frictionless lunch counter, a 0.410 submarine sandwich moving 2.90 to the left collides with a 0.260 grilled cheese sandwich moving 1.05 to the right. How much mechanical energy dissipates in the collision
A cylinder of mass 6.6 kg and radius 0.10 m rolls along a level floor. Its center of mass has a speed of 0.8 m/s. Find the kinetic energy of rotation
Two point charges q = 63.0 nC and q = -63.0 nC are in vacuum located on the x axis at -46.0 cm and 46.0 cm, calculate the total electric flux through the y-z plane
Two converging lenses (f1 = 9.00 cm and f2 = 6.00 cm) are separated by 18.0 cm. The lens on the left has the longer focal length. Locate the final image relative to the lens on the right
Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm, what force is exerted by the biceps muscle
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