Complete the following statement: Today, the standard unit of mass is defined in

Question

Complete the following statement: Today, the standard unit of mass is defined in terms of A box measures 3 feet by 4 feet by 6 feet. What is the volume of the box in cubic meters? A person walks 20 meters east in 10 seconds and then 50 meters west in 20 seconds What the average speed during the complete trip? A boy walks 2.25 m along the base of a wall. Upon reaching a comer, the boy's direction travel changes from west to south. The boy then walks 3.15 m before stopping. What is the magnitude of the boy's displacement? Vector A is represented in component notation as A = 40m x + 30m y. The magnitude direction of this vector are:

Explanation / Answer

(1) B

(2) Volume = 3 feet * 4 feet * 6 feet = 72 feet3 = 72 (1/3.28)3 m3 = 2.0 m3

so correct option is C

(3) Average speed = (total distance covered) / (total time taken) = (20+50) / (10+20) = 2.3 m/s

so correct option is D

(4) This is solved using pythagorus theorem d = (2.252 + 3.152)1/2 = 3.87 m

so correct option is A

(5) magnitude A = (402 + 302)1/2 = 50 m

direction = tan-1(30/40) = 37 degrees relative to +x axis

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