What mass of iron can be heated from 40 ° C to 70 ° C by bringing 30 k J heat if the specific heat capacity of iron is 420 J/kgK I FAILED THIS TEST 2 TIMES PLS HELP​

More solar radiation is absorbed by earth’s surface than by

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

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?