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A double convex lens has 10cm and 15cm as its 2 radii of curvature. The image of an object placed 30cm from the lens is formed at 20 cm from the lens on the other side. Find the refractive index of the material of the lens. What will be the focal length ? What will be the focal length of the lens if it is immersed in water of RI 1.33?
A 200-m-wide river flows due east at a uniform speed of 4.5m/s. A boat with a speed of 9.0m/s relative to the water leaves the south bank pointed in a direction 28o west of north. How long does it take for the boat to cross the river
It is then projected up the same plane with an initial speed 4.40 m/s. Explain how far up the incline will the block move before coming to rest?
An electric vehicle starts from rest and accelerates at a rate a1 in a straight line until it reaches a speed of v. How much time elapses from start to stop
In one cycle, a heat engine does 310 J of work and releases 620 J of heat to a lower-temperature reservoir. What is the efficiency of the engine
A coil has an inductance of 0.45 H and a resistance of 42 ohms. The coil is connected to a 5.6 V ideal battery. At what rate is the energy being dissipated
a proton with a momentum of 200 GeV/c collides with a proton at rest. Calculate the total energy in the center-of-mass system
A 2.75-gram air inflated balloon is given an excess negative charge, q1 = -3.00 × 10-8 C, by rubbing it with a blanket. It is found that a charged rod can be held above the balloon at a distance of d = 5.20 cm to make the balloon float. In order f..
The distance between points A and B along the open flow path is 500 ft. Calculate the total head loss between points A and B. Assume A and B are at the same elevation.
Find out the dividends per share for preferred and common stock for each year. Prepare a brief memo (no more than 120 words) giving the arguments for and against offering this preferred stock. In the memo also briefly mention other methods of obtai..
A uniform diving board, 12m long and 20kg mass is placed on a platform. How far can a 60kg person walk down the board from the edge of the platform without board tipping over.
a 26.5 kg boy slides down a steep slide at a water park that is 10.9 m long and angled 75 degrees above the ground. what is the magnitude of the boys acceleration as he travels down the slide
An empty storage tank has a volume of 135 ft3. What is the buoyant force exerted on it by the air
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