Electric kettle with the resistance of 20-22 is used to heat:4 kg of water. If the initial temperature of the water is 20°C, how much time-later-will the water boil?
C-water=-4200 J/kg°C. The kettle uses 220 V voltage. I
laatsia Iratilowice
Picture=Example

kinetic

i'm so sorry if this is wrong i'm only in 6th grade xd

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.