Exam Wi Dates 9-24-2018 Chapters 1,2344 100 points total Please use provided ser

Question

Exam Wi Dates 9-24-2018 Chapters 1,2344 100 points total Please use provided seratch paper (S pts) Express the speed ins it ot 25.0 iehr in serms ofm A) 40.2 m/s 8) 6.7 n/s 2 ws (5 pts) If the aceeloraryet veetor of an objees is constant and pimts in the same dirt the velocity veetor, A) the object is turning C) the object is speeding up Bj the object is mowing waconsank velocity 3.(10 pts) A net force of 2.5 N is used to acceterate a hockey puck. whic dhe object is slowing down ass of the puek is 0.5kg Assaming a constant puck after 30s? h A) 250 m B) 2250 m C) 500 D) 3150 m not iven 0 pts) A physies book is thrwtahn from the ruof of OLIN at an voisial ped o air resistance, what is the displacement of the book after 2.35 seconds of free fall? A)-28.3 m B) -23.5 m D)-50.1 mE not given 5. (5 pts) A force of 20.0 N pushes a box across a frozen lake. If the box has a mass of 2.50 v. what is the magnitude of acceleration for the box? A) 50.0 m/s C) 8.00 m/s D)9.80 ms E) not given B) 0.500 m/s (10 pts) Venus has a mass of 4.87410 kg and a radius of 6 05 due to gravity on Mars? 6 ( C)3.75 msD) 9.80 mi E) not gi B) 8.87 m/s A) 1.62 m/s (10pts) A car's velocity changes from 0.00 to 20.0 m/s with an acceleration of +4.25 m much time does this take? D)85.0s E C) 4.71 s B) 60.0 s (5 pts) A person has a mass of 78,650 grams. Which one of the folloving state the correct mass of the person in the SI unit of kilograms A) 6.31s (kg)? B) The persom has a mass of 78 D) The person has a mass of" 8 A) The person h A) The person has a mass of 78.65x10* kg C) The person has a mass of 78.65 kg

Explanation / Answer

Solution:

3) option e- not given

Since, F= ma

A= 5m/s^2

Then, displacement= 5*30= 150m

5) We know, F=m*a

20=2.5*a

So, a= 8m/s^2 (option c) Ans

6) A = GM/r^2
A = (6.67 * 10^-11)(4.87* 10^24) / (6.05 * 10^6)^2

A = 8.87 m/s^2 (option b) Ans

8) option c = 78.65 kg (Ans)

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Good luck!:)

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