A) a closed insulated tank is used to heat 400 l of chemical for a production process. there is no loss of heat energy from the tank. given the density of the chemical is 1100 kg/m3, initial temperature of the chemical is 15°c, and the specific heat value of the chemical is 2.2 kj/(kg. k) how much heat energy is required to raise the temperature of the chemical (i) to 40°c? (15 marks) (ii) how long will it take to heat the chemical to 40°c using a 4 kw heater fully immersed in the chemical? assume 100 % efficiency for the heater. (10 marks) state the units for your answers.

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?