HW 8 Begin Date: 1/19/2017 12:01:00 AM-Due Date: 4/12/2017 11:59:00 PM End Date:

Question

HW 8 Begin Date: 1/19/2017 12:01:00 AM-Due Date: 4/12/2017 11:59:00 PM End Date: 531/2017 10:00:00 AM 20%) Problem 5: A high-performance dragster with a mass of m 1458 kg can accelerate at a rate of a 25 m/s Randomized Variables m 1458 kg a 25 m/s A 33% Part (a) Write an expression for the magnitude of the net force, FNET that propels the dragster forward in terms of the variables provided. Grade Summary Deductions FNET Potential Late Work 50% Late Potential 50% 4 5 6 1 2 3 Attempts retsaanang C Per attesaapt) ure t give up! O Vel Feedback: deduction per feedback. it the Hints: 2s deduction per hint. Hints remaining: 4 33% Part m) If the track has length L and the dragster starts from rest, select the correct symbolic equation for how fast ythe dragster traveling when it finishes the run. (Assume that it accelerates at the same rate along the full length of the track) m s? 33% Part (c) Ifthe track is L 400 m long, what is the numerical value of the dragster's final speed, yin

Explanation / Answer

Given mass(m)=1458kg

Acceleration of man =25m/s2

The net force acting on the block is

F=ma

=(1458kg*25m/s2)

=36450N

Part b

Initial velocity =0

Final velocity(v)=?

Displacement =L

From the third equation

V2-u2=2aL

V=sqrt(2aL)

Part c

Given L=400m

a=25m/s2

V=sqrt(2*25*400)

141.4m/s

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