216 joules of energy is required to raise the temperature of aluminium from 15 degrees celsius to 35 degrees celsius. calculate the mass of aluminium.
note : the specific heat capacity of aluminium is 9.2 x 10^2

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?