This print-out should have 3 questions. Multiple choice questions may continue o

Question

This print-out should have 3 questions. Multiple choice questions may continue on 3. the next column or page find all choices before answering. Note: on the last problem, the units on x are meters m the units on Velocity v are 5. eration per second the units on Acce m a are meters per s the units on time t are seconds (s) 7. mi 001 10.0 points Evaluate Inla ie., the units ofr, in the express- 8. (m sion 003 10.0 (s-b) (s Consider the equations L to are where s (a +b+ c and a, b, and c have IL y (2 a) cos(kar units of meters Which ones are dimen 1. Irl m 1.I and II only 2. I only 3. 3. II only 4. Irl 4. III only 5. I and III only 6. II and III only 6. 7. None is correct. 8. All are correct 9, Irl in 002 10.0 points.

Explanation / Answer

(001)

[r] = m. This is because since a,b,c are in metres, this means that s will also be in metres, and so are the terrms (s-a),(s-b), and (s-c) ; because otherwise we cannot subtract a, b, c from s

This means that numerator has m3 dimension, which when divided by m and then square rooted, gives final dimension of metre.

(002)

Following the same argument as above, the answer for this part is: seconds

(003)

Only the II equation is dimensionally correct. All else have errors.

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