which of the following is not a unit of energy PETYS 201: Practice Questions ci

Question

which of the following is not a unit of energy PETYS 201: Practice Questions ci Which of the foll owing Is nof a unit of e b. kilowatt-hour a, watt-sec c. watt d. joulee. none ofthese C.2. Four students are pushing on crate so as to move it in the positivex-direction The magnitude of the force applied by each student is F. Which student does the most wok? a. A d. D b. B e. none of them c. C B 3, Cart A has a mass of 3.0kg and a constant velocity of 2 m/s. Cart B has a mass of 1 5 kg and a constant velocity of 3 m/s. Which statement is true? a. Cart A has the greater kinetic energy. b. Cart B has the greater kinetic energy c. Cart A has the greatest acceleration.d. Cart B has the greater acceleration e. None of these. Questions 4,5: A force moves a 2.0 kg object initially at rest from 0.0m to 15 m in the direction of the force. The graph below shows the force versus the position of the object. B.4. Find the work done in J. e. none of these b. 30 c. 22.5 d 45 4 D. S. Find the final speed ofthe object in m s. c. 4.9 a. 0 d. 5.5 b. 7.5 e. none of

Explanation / Answer

C.1 Ans: (c) watt is a unit of power.

  
C.2 Work done = Fd

both are same for all so all does the same work.

(e)

B.3: acceleration for both is zero. (constant velocity)

KA = 3 x 2^2 / 2 = 6 J

KB = 1.5 x 3^2 / 2= 5.75 J

Ans:(b)

B4: W = area of F -x curve

W = (5 x 3 / 2) + (5 x 3) + (5 x 3 / 2)

W = 30 J

Ans(b)

B5: Work done = change in KE

30 = 2 v^2/ 2

v = 5.48 m/s

Ans(d)

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