take off. Suppose the work done by such a catapult system is 5.0 x 107 J when ac

Question

take off. Suppose the work done by such a catapult system is 5.0 x 107 J when accelerating an F-18 fighter jet from rest to 70 m/s. Find the mass of an F-18 fighter jet, and find the power output of the catapult system if the catapult is in contact with the jet for 2.0 s. 4. How much work is needed to accelerate a 1200-kg car from rest to 72 km/hr? 5, A young girl (m = 30 kg) rides a skateboard (m = 3.2 kg) at a speed of 4.2 m/s. (a) How much work does the girl have to do to bring herself to a stop? (b) How far does she travel if it takes 6.0 s to stop? (c) What is the magnitude of the stopping force?

Explanation / Answer

3

work done by catpult system is

W=(1/2)mV2

(5*107)=(1/2)*m*702

m=20408.2 kg

4.

Given Vf=72 *1000/3600=20 m/s

since it starts from rest Vi=0

Work done is given by

W=(1/2)mVf2-(1/2)mVi2

W=(1/2)*1200*202-0

W=240,000 J

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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