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A battery has an emf and an internal resistance r. When the battery is connected to a 25Ω resistor, the current through the battery is 0.55 A. When the battery is connected to a 48 Ω resistor, the current is 0.45 A. Find the emf of battery and its internal resistance.
A 1000kg car moving 40m/s skids to a stop. During the skid, the only force is the frictional force between the tires and the road, What is the initial kinetic energy of the car
A person pulls a toboggan for a distance of 30-m along the snow with a rope directed 25.0° above the snow. The tension in the rope is 98-N.
Verify that the following f-stops and shutter speeds all give the same exposure : f2 at 1/200 s ; f2.8 at 1/100 s ; f4 at 1/50 s ; and f5.6 at 1/25 s.
A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 5.00 km from the source, What is the average power radiated by the source
A 1000-turn loop (radius = 0.032 m) of wire is connected to a (20 ohm) resistor, What is the direction of the induced current
An 7.80 ball, hanging from the ceiling by a light wire 105 long, is struck in an elastic collision by a 2.20 ball moving horizontally at 5.00 just before the collision. Find out the tension in the wire just after the collision.
A 27 pound meteorite struck a car, leaving adent 10 cm deep in the trunk. Ifthe meteorite struck the car with a speed of 250 m/s, what was the magnitude of its deceleration
question as a high-power laser engineer you need to focus a1.17-mm diameter laser beam to a10.3-microm diameter
A bird stands on a dc electric transmission line carrying 2540 A, What is the potential difference between the bird's feet
A man driving a car toward a large vertical wall sounds his horn. The car is traveling at 92 km/h. What is the frequency of the car horn
A blacksmith cools a 1.30-kg chunk of iron, initially at a temperature of 650.0?C, by trickling 15.0?C water over it. How much water did the blacksmith trickle over the iron
An inexpensive microscope has a tube length of 12.0cm , and its objective lens is labeled with a magnification of 10x. Calculate the focal length of the objective lens
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