Only a fraction of the electric energy supplied to a tungsten lightbulb is converted to visible light. the rest of the energy shows up as infrared radiation (i. e., heat). a 75-w lightbulb converts 15.0 percent of the energy supplied to it into visible light (assume the wavelength to be 550 nm). how many photons are emitted by the lightbulb per second (1 w = 1 j/s)?

1.in one challenge on the titan games, competitors have to lift 200 pounds up a long ramp. angel is able to move the weight in 42 seconds. anthony gets it done in only 38 seconds. which statement is true? angel has more power than anthony. angel does more work than anthony. anthony does more work than angel. anthony has more power than angel. 2.a mountain climber exerts 41,000 j of work to climb a cliff. how much power does the climber need if she wants to finish in only 500 seconds? power = work / time 20,500,000 watts 82 watts 0.0122 watts 41,500 watts 3.your family is moving to a new apartment. while lifting a box 83 joules of work is done to put the box on a truck, you exert an upward force of 75 n for 3 s. how much power is required to do this? (hint: you only need two of the 3 numbers given! ) power = work / time 249 watts 25 watts 2075 watts 27.7 watts

If vx = 7.00 units and vy = -7.60 units, determine the magnitude of v⃗ . determine the direction of v⃗ .

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is