THE PROBLEM Scientists sometimes need to extract tissue samples from wild animal
ID: 1774758 • Letter: T
Question
THE PROBLEM Scientists sometimes need to extract tissue samples from wild animals, such as whales or lions. To minimize impact on the animal, a dart gun is often used and the animal never needs to be captured. Suppose a particular dart having mass m-8.7 g penetrates d-2 cm into the animal, and the dart takes t-88 ms to come to rest within the animal's tissue. The dart's deceleration is constant as it goes into the animal. (a) What is the magnitude of the force felt by the animal? (b) What is the magnitude of the impulse on the animal? PAPER SOLUTION INTERPRET DEVELOP Derive an algebraic expression for the magnitude of the force. Derive an algebraic expression for the magnitude of the impulse. EVALUATEExplanation / Answer
d = v t + a t^2 / 2
and vf = v + a t
so v = - a t
d = - a t^2 + a t^2 / 2
d = - a t^2 / 2
0.02 = - a (0.088^2) /2
a = - 5.165 m/s^2
(A) force = m a = 0.045 N
(B) Impulse = m (vf - v) = m v
= m a t
= 3.95 x 10^-3 N s
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