Complete the following statement: Today, the standard unit of length is defined
ID: 583038 • Letter: C
Question
Complete the following statement: Today, the standard unit of length 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 was the average speed during the complete trip? A boy walks 4.50 m along the base of a wall. Upon reaching a corner, the boy's direction of travel changes from west to south. The boy then walks 6.30 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 an action of this vector are:Explanation / Answer
1)
ANSWER : E)speed of light
! meter is defined asthe distance travelled by light in a specific fraction (1/299 792 458) of a second.
where 299 792 458 is the distance in meter traveled by light in 1 second
2)
Volume,
V = 3*4*6*(1/3.28)^3 = 2.04 m <---------- option C
3)
average speed,
v,avg = (20+50)/(10+20) = 2.3 m/s
4)
Displacement,
d = sqrt(4.5^2 +6.3^2)
= 7.74 m
5)
magnitude,
F = sqrt(40^2 +30^2) = 50 m
direction = atan(30/40) = 37 deg <---------answer (C)