8: As a grade-school project, students construct a mobile representing some of the major food groups. Their completed artwork is shown below. Find the masses mi, m2, and m3 that are required for a
perfectly balanced mobile.

m1=0.72kg m2=0.48kg m3=0.98

Explanation:

12*m1=18*m2, so 2*m1=3*m2

6*(m1+m2)=24*.03, so 2*m1+2*m2=2.4

so, 5*m2=2.4, m2=0.48 then, m1=0.72

(m1+m2+0.3+0.2)*18=31*m3

1.7*18=31*m3

m3=0.98

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.