A lamp is switched on for 2.0 hours. The power input to the lamp is 1.0 W. The energy given outby the lamp as light is 7.0 10 3 J.How much energy is converted to other forms by the lamp?A 120 J B 200 J C 3400 J D 7200 J
Question
A lamp is switched on for 2.0 hours. The power input to the lamp is 1.0 W. The energy given outby the lamp as light is 7.0 10 3 J.How much energy is converted to other forms by the lamp?A 120 J B 200 J C 3400 J D 7200 J
Solution
First, we need to calculate the total energy input to the lamp.
The power input to the lamp is 1.0 W (Watt), which is equivalent to 1.0 Joule per second.
The lamp is switched on for 2.0 hours. To convert this to seconds, we multiply by 3600 (since there are 3600 seconds in an hour).
So, the total energy input to the lamp is 1.0 W * 2.0 hours * 3600 seconds/hour = 7200 J (Joules).
The energy given out by the lamp as light is 7.0 x 10^3 J = 7000 J.
The energy converted to other forms by the lamp is the total energy input minus the energy given out as light.
So, the energy converted to other forms is 7200 J - 7000 J = 200 J.
Therefore, the correct answer is B) 200 J.
Similar Questions
A lamp transfers 108 kJ of energy.Calculate the power of this lamp if it is used for 1 hour.Power = _____ W1800300.03108 000
A 100-W light bulb is left on for 8.0 hours. Over this period of time, how much energy was used by the bulb?Select one:a.2 880 000 Jb.28 800 Jc.1.34 hpd.800 Je.288 000 J
Calculate the power of a lamp when it is on for half an hour and does 54 kJ of work.Power = _____ W
17 A motor is used to lift a load vertically upwards.The load has weight W.The motor produces useful power output P.The load is lifted at constant velocity v.Which expression gives the time taken for the motor to lift the load vertically upwards through adistance d ?A WdP B PWv C PWd D WPv18 A lamp is switched on for 2.0 hours. The power input to the lamp is 1.0 W. The energy given outby the lamp as light is 7.0 10 3 J.How much energy is converted to other forms by the lamp?A 120 J B 200 J C 3400 J D 7200 J19 An object of mass m is dropped onto the surface of two planets, X and Y, which have noatmosphere.The height from which the object is dropped and the change in gravitational potential energy ofthe object, for each planet, are given in the table.height / m change in gravitationalpotential energyplanet X 3 ∆Eplanet Y 4 4∆EThe acceleration of free fall near the surface of planet X is gX .What is the acceleration of free fall near the surface of planet Y?A X43 g B X34 g C 3gX D 4gX20 A known tensile force acts on a metal wire. The wire does not exceed its limit of proportionality.Which two measurements enable the strain of the wire to be calculated?A the unstretched length of the wire and the cross-sectional area of the wireB the unstretched length of the wire and the extension of the wireC the Young modulus of the metal and the extension of the wireD the Young modulus of the metal and the unstretched length of the wire
An energy-efficient light bulb transforms 100 J of input energy into 75 J of light energy. Another 25 J of heat energy is produced as waste.Calculate the light bulb's energy efficiency
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.