A student investigates the amount of energy wasted in four different lamps. She uses the equipment shown in Figure 1. Plan an investigation to find out how much the lamp affects the temperature of the surroundings in 5 minutes. The first step has been given. 1 Set up the apparatus using lamp 1 and take the starting temperature.

the total distance traveled by the car is

30km + 49km = 79 km .

the higher the current the higher the mag field around it the higher the influence on the compass

statement #3 on andre"s list is false.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.