I got parts B and D. So I need help with A and C. for A I keep getting 6x10^-5 b

Question

I got parts B and D. So I need help with A and C. for A I keep getting 6x10^-5 but it says its wrong. And for C I keep getting .03 and it says wrong. Thanks for the help.

Exercise 8.35

In July 2005, NASA's "Deep Impact" mission crashed a 372-kg probe directly onto the surface of the comet Tempel 1, hitting the surface at 37000 km/h. The original speed of the comet at that time was about 40000 km/h, and its mass was estimated to be in the range (0.102.5)×1014kg. Use the smallest value of the estimated mass.

Part A

What change in the comet's velocity did this collision produce?

ANSWER:

6105

Incorrect; Try Again; 3 attempts remaining

Part B

Would this change be noticeable?

ANSWER:

Correct

Part C

Suppose this comet were to hit the earth at 40000 km/h and fuse with it. By how much would it change our planet's velocity? (The mass of the earth is 5.97×1024kg)

ANSWER:

.03

Incorrect; Try Again; 5 attempts remaining

Part D

Would this change be noticeable?

ANSWER:

Correct

6105

Explanation / Answer

(a)

Apply cosnervation of momentum

p1x = p 2x

v 2x = (mA V a1x + mB vB 1x / mA+ mB)

change in velocity = v2x - vB1x = ( mA/ mA+ mB) vA1x + ( mB- mA- mB/ mA+ mB) v B1x

del v = ( mA/ mA+ mB) ( vA1x- vB1x)

=372/372+0.10 * 10 ^14 kg) (-37000 km/h)

=-1.4 * 10 ^-6 km/h

the change in comet's velocity is 1.4 * 10 ^-6 km/h

(c)

delv= 0.10 * 10 ^14 kg/ 0.10 * 10 ^14 kg+5.97 * 10 ^24 kg ) (-40000 km/h =-6.7 * 10 ^-8 km/h

the change in planet velocity is 6.7 * 10 ^-8 km/h

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