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An electric motor is plugged into a standard 120V electrical service. At startup a current of 23.4A is measured. What is the back emf if an operating current of 5.4A is measured once the motor is operating at speed? If a resistor is added to limit the in-rush (starting) current to 10A. What vaule is needed and what is the operating current with the new resistor added.
A 87 arrow is fired from a bow whose string exerts an average force of 120N on the arrow over a distance of 78cm. Evaluate the speed of the arrow as it leaves the bow?
A ball rolls off a table with a horizontal velocity of 5 m/s If it takes 0.6 secs for it to reach the floor A. What is the verticle componet of the balls velocity just before it hits the floor? (use g= 10 m/s^2) B. What is the horizontal componet ..
In a physics demonstration, two rubber balls are dropped down a tube towards the ground,with the lighter ball behind, How high does the light ball rise after the two collisions
Plutonium decays radioactively by emitting an alpha particle from its nucleus, If the alpha particle comes from the surface of the Plutonium nucleus, what is its greatest acceleration
Two charges Q1 = 48 muC and Q2 = 88 muC are found to have a potential energy of 43 J . What is the distance between the charges?
A 54.0 kg ice skater is gliding along the ice, heading due north at 4.10 m/s. What is the minimum value of Ug that allows her to continue moving straight north
If this system is used with a detector with an intrinsic pulse height resolution of 4%, what will be the expected overall pulse height resolution
Two long, straight, parallel wires of length 3.6 m carry parallel currents of 3.2 A and 0.9 A. What is the magnitude of the force between the two wires
Assume you are 80cm from a plane mirror. What area of the mirror is used to reflect rays entering one eye from a point on the tip of your nose if your pupil diameter is 5.60 mm.
A delivery truck travels 32 blocks north, 16 blocks east, and 26 blocks south. Assume the blocks are equal length. Illustrate what is the magnitude of its final displacement from the origin?
Evaluate (a) the acceleration of each object, (b) the tension in the string, and (c) the coefficient of kinetic friction between m2 and the incline.
A spaceship is visiting Planet X. While descending to the surface,its rockets produce 25 kN of upward thrust and the spaceship%u2019s speed decreases at a rate of 0.15 m/s2. What is the mass of the spaceship
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