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)?

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

Of is j/kg·k. if a 2.6 kg of isk to k,is ?