How long does it take light from the sun to reach the earth?

What do you think car designers do if the damage caused by a crash test is too severe?

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?