iPad 19, 757 p.m. webassign net Sign In PH101 Homework Assignment 2 Serway, Phys

Question

iPad 19, 757 p.m. webassign net Sign In PH101 Homework Assignment 2 Serway, Physics A car accelerates uniformly from rest to a speed of 45.0 mi/h in 13.0 s. (a) Find the distance the car travels during this time. 261.462 Your response differs from the correct answer by more than 10%. Double check your calculations. m (b) Find the constant acceleration of the car. 1.547 m/s Need Help? Read It iChat About It -1 points SerCP92 P033 My Notes In a test run, a certain car accelerates uniformly from zero to 20 m/s in 2.95 s. (a) What is the magnitude of the car's acceleration? m/s2 (b) How long does it take the car to change its speed from 10.0 m/s to 20 m/s? (c) Will doubling the time always double the change in speed? Yes O No Why? 50% Ask Your Teacher

Explanation / Answer

(a) v =u +at

u = 0 , v =45 mi /h =20.1168 m/s , t = 13 s

==> a = 20.1168 /13 = 1.547 m/s2

distance s = ut + (1/2)at2 = 1.547 x 132 /2 = 130.75 m

(19)

v =u +at

u = 0 , v =20 m/s  , t = 2.95 s

(a) acceleration a = 20 / 2.95 = 6.779 m/s2

(b) v =u +at

u = 10 m/s , v =20 m/s

time t = 20 - 10 / 6.779 = 1.475 s

(c) No

why ?

v =u +at

as linear eqn it depends upon both u and a apart from time

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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