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Suppose that we are designing a cardiac pacemaker circuit. The circuit is required to deliver pulses of 1-ms duration to the heart that can be modeled as a 500-? resistance. The peak amplitude of the pulses is required to be 5V. However, the battery delivers only 2.5V. Therefore, we decide to charge two equal value capacitors in parallel from the 2.5-V battery and then switch the capacitors in series with the heart during the 1-ms pulse. What is the minimum value of the capacitors required so the output pulse amplitude remains between 4.9V and 5.0V throughout its 1-ms duration? If the pulses occur once a second, what is the average current drain from the battery? Use approximate calculations assuming constant current during the output pulse. Calculate the ampere-hour rating of the battery so it lasts for five years.
A diffraction grating with 395 lines/mm is 1.00 m in front of a screen. What is the wavelength of light whose first-order maxima will be 16.9 cm from the central maximum on the screen.
Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass and radius of orbit. The satellites fire rockets that provide force needed to keep a circular orbit around the space stat..
The effects of the spin of the earth
Two charged pith balls are suspended on very light 10.7 cm strings. Each has a mass 11.0 g. In stability, the total angle between the strings is 37 degrees. Draw the free body diagram for one of the pith balls and clearly label all forces with magnit..
A 64-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 834 N. What is the acceleration of elevator.
Find out vertical and horizontal components
A 4.20 kg model rocket is launched, expelling 57.0 g of burned fuel from its exhaust at a speed of 675 m/s. What is the velocity of the rocket after fuel has burned.
What is final total energy of the system
If she is served 200 of coffee at 85 in a well-insulated container, how much ice at 0 must she add to obtain a final temperature of 33.
What is the coefficient of static friction
The length of an air column that produces a strong resonance in a cylinder is 0.18m, what is the frequency of the tuning fork being used .
As the block has raised a vertical height of 0.725, the tension in the cord is 4.66 .What is the velocity of the bullet originally.
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