atredactory Phes PHV 21-4 5 pts) Espress the speed Noit of 25.0mileshr in terms

Question

atredactory Phes PHV 21-4 5 pts) Espress the speed Noit of 25.0mileshr in terms B) 6.7 ms (pts) If the acceleration veetor of an bject is comstant and points in the velocity vector A) the object is turning B) the object is moving at a constant velocity C) the ohject is slowing down The (10 pts) A et faree of 2.5 N is used to rate a bockey puck, which is initially mass of the pack is 8.5kg Asseming a constant puck after 30s? A) 250 m D) 3150 m E) not given B) 2250 m C) 500 m (10pts) A physics bok st omn from the roof of OLIN at an initial speed of s Igaoring air resistance, what is the displacement of the book after 2.35 seconds ot free fall? A)-28.3 m B) -23,5 m C) 28.3 ms D)-50.1 m E) not given (5 pts) A force what is the of 20.0 N pushes a box across a frozen lake. If the box has a mass of 2.50 kg _ B) 0.500 m/s C) 8.00 m/s D) 9.50 m/s E) not given (10 pts) Venus has a mass of 4.87%10 kg and a radius of 6.05x10f m. What is the acceleration due to gravity on Mars? A) 1.62 m/s B) 8.87 m/s C) 3.75 m/s D) 9.80 m/s E) not given (1opts) A car's velocity changes from 0.00 to 20.0 m/s with an acceleration of +4.25 m/s. How much time does this take? A) 6.31 s B) 60.0 s C) 4.71 s D) 85.0s E) not given 8 (5 pts) A person has a mass of 78.650 grams, which one of the following statements indicates the correet mass of the person in the SI unit of kilograms (kg)? A) The person has a mass of 78.65xi0 kg B) The person has a mass of 78.650 kg C) The person has a mass of 78.65 kg D) The person has a mass of 7.865 kg

Explanation / Answer

Solution:

1) 25 miles/hour into m/s

We know, 1 mile/hour= 0.447 m/s

So, 25 miles/hour= 25*0.447= 11.2 m/s option c (Ans)

2) option b- the object is moving at constant velocity

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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Please post othet questions seperately. Good luck!:)

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