It is desired that the radiation energy emitted by a light source reach a maximum at 470 nm. Determine the temperature of this light source and the fraction of radiation it emits in the visible range (i. e 0.40–0.76 µm)

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.

You can decrease the resistance of a length of wire by

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?