A Baseball Player Friend of Ye secure httpst/session masteringphysics.com/myctit

Question

A Baseball Player Friend of Ye secure httpst/session masteringphysics.com/myctitemview?assignmentProblemIDm7g241387&offset-next; PHYSICS 255NOVIKOV previous 12 of 10 next tic Problem 4.46 Part A What is his pitching speed? baseball player friend of yours wants to Express your answer using two significant figures. determine his pitching speed. You have him stand on a ledge and throw the ball horizontally from an toa 25 m/s elevation 5.0 m above the ground. The ball lands 25 m away. Submit My Answers Give Up Correct Part B As you think about it, you're not sure he threw the ball exacty watch him throw, the horizontally. As you which seem to vary from 5 below horizontal to 5 horizontal. What is the range of speeds with the ball might have left his hand? Enter the minimum and the speed of the ball maximum Enter your answers using two significant figures eparated by a comma. vmin vmez 10.7, 33.1 m/s Submit My Answers Give Up Incorrect: Try Again: 5 attempts remaining

Explanation / Answer

Here, the horizzontal range, R = 25 m.

Now, for the first case - 5° below horizontal -
=>By R = [Ux] x t
=>25 = ucos5* x t
=>ut = 25.1 ----------(i)
=>By s = ut + 1/2gt^2
=>5 = usin5* x t + 4.9t^^2
=>5 = 25.1 x 0.087 + 4.9t^2
=>t = 0.57
=>t = 0.76 sec
=>By (i) :-
=>u = 25.1 / 0.76 = 33.11 m/s
And for the second case - 5° above horizontal -
=> By R = [Ux] x t
=>25 = ucos5* x t
=>ut = 25.1 ----------(i)
=>By s = ut + 1/2gt^2
=>5 = -usin5* x t + 4.9t^^2
=>5 = -25.1 x 0.087 + 4.9t^2
=>t = 1.47
=>t = 1.21 sec
=>By (i) :-
=>u = 25.1 / 1.21 = 20.73 m/s

Hence, minimum and maximum speed of the ball are -

21 m/s and 33 m/s (two significant digits)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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