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An electric doorbell requires a 12V, 60 Hz ac supply. (a) What turn ratio is required on a transformer to operate from a 120 V, 60 Hz ac supply? (b) Is this a step-up or step-down transformer? (c) If the transformer is connected the wrong way around the circuit, what voltage is supplied to the doorbell?
A 60 kg football player is running down the field at a speed of 5 m/s. He is being chased by a 40 kg player who is running at a speed of 6 m/s. How fast is the second player moving
A football is punted with an initial velocity of 28.7 m/s and an initial angle of 54.1o. What is its hang time
The density of a 2.39-m long rod can be described by the linear density function ?(x) = 107 g/m + 11.9x g/m2, Determine the total mass of the rod
A daredevil plans to bungee jump from a balloon 72.0 m above a carnival midway. He will use a uniform elastic cord, What length of cord should he use
A rectangle has a length of 5.50m and a width of 12.0m. What are the perimeter and area of this rectangle
A baseball is thrown from the roof of 23.1 -tall building with an initial velocity of magnitude 11.5 and directed at an angle of 52.0 above the horizontal. What is the speed of the ball just before it strikes the ground? Use energy methods and ignore..
In diving to a depth of 133 m, an elephant seal also moves 664 m due east of his starting point. What is the magnitude of the seal's displacement
An LC circuit consists of a capacitor, C = 3.52 µF, and an inductor, L = 4.22 mH. The capacitor is fully charged using a battery and then connected to the inductor. Determine the resistance of the resistor
a heat pump has a coefficient of performance equal to 4.35 and requires a power of 1.77 kw to operate.a how much energy
A beam of unpolarised light with a power of 70 mW is passed through two polarisers in series, with their polarisation directions parallel to each other. What is the maximum power that can be transmitted through the two
A geiger counter registers a count rate of 4,000 counts per minute from sample of a radiosotope. twelveminutes later the count rate is 1000 counts per minute. what is the half-life of the radiosotope?
Calculate the acceleration due to gravity on Neptune. The radius of Neptune is about 2.21 x 107 m and its mass is 1.03 x 1026 kg. m/s2 (downward)
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