(( QUESTION 1 )) A 1100kg automobile travels at 80km/h. PART A What net work wou

Question

((QUESTION 1)) A 1100kg automobile travels at 80km/h.

PART A

What net work would be required to bring it to a stop?

Express your answer using two significant figures.

(QUESTION 2)

Suppose that the coefficient of kinetic friction between Zak's feet and the floor, while wearing socks, is 0.250. Knowing this, Zak decides to get a running start and then slide across the floor.

Part B

Now, suppose that Zak's younger cousin, Greta, sees him sliding and takes off her shoes so that she can slide as well (assume her socks have the same coefficient of kinetic friction as Zak's). Instead of getting a running start, she asks Zak to give her a push. So, Zak pushes her with a force of 125 N over a distance of 1.00 m. If her mass is 20.0 kg, what distance d2 does she slide after Zak's push ends?

Remember that the frictional force acts on Greta during Zak's push and while she is sliding after the push.

Express your answer in meters.

Explanation / Answer

F= Fp-Fr
E= F*Lp= (Fp-Fr)*Lp= Fr*Lr
Lr= Lp*((Fp/Fr)-1)
Lr= 1*((125/(20*9.8*0.25))-1)= 1.6 m

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.