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An energy efficient light bulb, taking in 28.0 W of power, can produce the same level of brightness as a conventional light bulb operating at power 100 W. The lifetime of the energy efficient bulb is 10000 h and its purchase price is $17.0, whereas the conventional bulb has a lifetime of 750 h and costs $0.420 per bulb. Decide the total savings obtained by using one energy efficient bulb over its lifetime as opposed to using conventional light bulbs over the same time interval. Suppose an energy cost of $0.80 0 per kilowatt-hour.
A 0.200 kg projectile is fired with a velocity of +745m/s at a 2.0kg wooden block that rests on a frictionless table. The velocity of the block, immediately after the projectile passes through it, is +45 m/s. Find out the velocity with which the p..
Suppose you have a lens system that is to be used primarily for 770 nm light. What is the second thinnest coating of fluorite that would be nonreflective for this wavelength
A 300 bird flying along at 6.0 m/s sees a 7.0 g insect heading straight toward it with a speed of 25m/s (as measured by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch. What is the bird's speed immed..
Two protons are moving directly toward one another. When they are very far apart, their initial speeds are 2.10 e 10^6 m/s. What is the distance of closest approach? Please show work in the answer because I am attempting to learn this.
A billiard ball A moving at 5.00m/s hits another ball B, initially at rest, of the same mass. Find the velocity (magnitude and direction) of the second ball after the collision
A small current element located at the origin has a length of 2.00 mm and carries a current of 2.0 A in the +z direction. Discover the direction and magnitude of the magnetic field due to this current element at the point (0.0, 0.3m, 0.3m)
Linear polarizers whose transmission axes make an angle of 45degree with each other The transmitted light intensity through both polarizers is what percentage of the incident intensity?
During 0.27 s, a wheel rotates through an angle of 2.20 rad as a point on the periphery of the wheel moves with a constant speed of 2.69 m/s
A certain telescope has an objective mirror with an aperture diameter of 153 mm and a focal length of 1610 mm. It captures the image of a nebula on photographic film at its prime focus by an exposure time of 1.34 minutes.
A 1500 kg car traveling at 90 km/h east collides with a 3000 kg cartraveling at 60 km/h south. What is the direction of motion of the cars after collision
q1. a force vector points at an angle of 64.9 deg above the x axis. it has a y component of 276 newtons n. find out a
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