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A 100-W, 120-V lightbulb has a resistance of 12 Ohms when cold (20 degrees C) and 140 Ohms when on (hot). Calculate its power consumption at (a) the instant it is turned on, and (b) after a few moments when it is hot.
A child looks at a reflective Christmas tree ball ornament that has a diameter of 9.0cm, How far is the child's face from the ball
In an instant given two cars are moving in opposite directions and they are separate a distance of 300km. Determine the distance in Km that each car travel in that time
a pion decays into a muon and a neeutrino. in the rest frame of the pion the muon always has a speed of .507c. if a
The level of the liquid surface in the tank can be calculated. If the pressure on the gage is 20 kPa, Determine the depth d of liquid in the tank?
A bullet with mass 5.06 g is fired horizontally into a 2.038-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
The speed of a bobsled is increasing because it has an acceleration of . At a given instant in time, the forces resisting the motion, including kinetic friction and air resistance, total 500 N.
A toroidal solenoid has a mean radius of 18.0 cm and a cross-sectional area of 4.00 cm^2 and is wound uniformly with 115 turns. What is the mutual inductance (M) of these coils
Assume that a drop of mercury is an isolated sphere. What is the capacitance of a drop that results when 10 drops each of radius R = 2.80 mm merge
A playground merry-go-round, made in the shape of a solid disk, hasa diameter of 2.50 m and a mass of 350.0 kg. Two children, each ofmass 30.0 kg, sit on opposite sides at the edge of the platform.Approximate the children as point masses.
A vacuum cleaner is connected to a 120V socket and uses 3.0 A when the back emf generated by the electric motor is 72 volts. What is the resistance of the coil in the motor?
The spaceship Enterprise 1 is moving directly away from earth at a velocity that an earth-based observer measures to be +0.80c. A sister ship, What is the velocity of Enterprise 2
A string 1.4 m long with a mass of 2.1 g is stretched between two fixed points with a tension of 80 N. Find the frequency of the fundamental on this string
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