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A motor may be modeled as a series RL circuit. A particular motor operates from an ordinary 60-Hz wall outlet with Erms= 115 V. The motor draws a current of Irms= 2.5 A. If the effective resistance is R= 16 ohms, what is the inductive reactance of the circuit?
A person driving her car at 57km/h approaches an intersection just as the traffic light turns yellow. She knows that yellow light lasts only 2.0 s before turning to red, and she is 30m away from the near side of the intersection.
A 5.00 mL syringe has an inner diameter of 6.00 mm, a needle inner diameter of 0.210 mm, and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100..
federal statute requires that a car's bumper be designed to withstand a 2.50 mph (1.12m/s) collision with an immovable object without damage to the body of the car. Calculate the average force on a bumper
The magnitude of the field produced by a point charge of +5.4 micro-coulombs has a magnitude of 5.9 x 106 N/C, How far is the point from the charge
Three pendulums with strings of the same length and bobs of the same mass are pulled out to angles q1, q2 and q3 respectively and free. The approximation sin q = q holds for all three angles, with q3 > q2 > q1. How do the angular frequencies of th..
The intensity I of light from an isotropic point source is determined as a function of distance r from the source. What is the power of the source
10 A of current flows through a wire oriented perpendicular to a magnetic field strength of .2T, What is the magnetic force per unit length on the wire?
the distance between the slits in the two-slit experiment is 1.50 x 10^ -5 m. What is the distance on the screen between the central bright fringe and the 4th order bright fringe
A 189g block is launched by compressing a spring of constant k= 200 N/m a distance of 15cm. After launch, where does the block finally come to rest? Measure from the left end of the frictional zone
An air conditioner draws 12 A at 220 V ac. The connecting cord is copper wire with a diameter of 1.450 mm. how much power does this air conditioner draw
De Broglie postulated that the relationship ? = h/p is valid for relativistic particles. What is the de Broglie wavelength for a (relativistic) electron
An undersea research chamber is spherical with an external diameter of 3.90m . The mass of the chamber, when occupied, is 30800kg. What is the buoyant force on the chamber
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