After the landing device’s reverse thrusters deploy, the device descends another 1000m towards the surface of Mars in 20s. What is the device’s velocity?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.