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A group of dog pulls a sled across a snow covered surface. It takes 5 hours to pull the 200 kg sled 100 kilometers. If the static friction is 0.4 and the dynamic friction is 0.1 what is the average power exerted by the dog sled team?

(A) 1,067 W

(B) 5,333 W

(C) 3,84 kW

(D) 266.8 W

The Correct Answer

Using the Gibbs Phase Rule, how many intensive properties are required to fix a mixture of water and ammonia that is in a liquid state?

(A)1 (B) 2 (C) 3 (D) 4

Correct Answer: C

Which of the following is FALSE with regards to creep I. May involve the sliding of whole grains II At high stresses creep is controlled by the movement of vacancies. III Also known as hot flow IV Creep is a time dependent deformation

(A) I (B) II (C) III (D) IV

Correct Answer: C

Reactions on average will proceed faster at a higher temperature because of which of the following?

(A) There is less energy in the molecules (B) Molecules collide more frequently (C) The amount of exergy is diminished (D) The energy to start the reaction is higher

Correct Answer: B

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