Question

Question )

a)

15 mm 115 mm 7.5 mm 115 mm 15 mm 50 mm 50 mm

Determine the I-beam's cross-sectional moment of inertia I_x about the horizontal x axis passing through the centroid.

options:

a	1.42 x 106 mm4
b	5.3 x 107 mm4
c	2.5 x 106 mm4
d	1.25 x 106 mm4
e	4700 mm4

b)

Determine the I-beam's cross-sectional moment of inertia I_y about the vertical y axis passing through the centroid.

options:

a	5.3 x 107 mm4
b	2.5 x 106 mm4
c	4.10 x 106 mm4
d	1.29 x 107 mm4
e	1.25 x 106  mm4

c)

What is the atomic number of an atom?

options:

a	It is the total number of electrons, protons, and neutrons in the atom.
b	It is the total charge of the atom.
c	It is the total number of protons and neutrons in the atom.
d	It is the number of protons in the atom.
e	It is the total charge of the nucleus.

d)

A positively charged insulated rod is brought close to an object that is suspended by a string. If the object is shifted towards the rod we can conclude:

options:

a	The object is positively charge.
b	The object is an insulator.
c	The object is a conductor.
d	None of these answers are correct.
e	The object is negatively charged.

e)

A small glass bead has been charged to +20 nC. An electron is placed 1.0 cm from the bead. What is the acceleration of the electron?

Question 25 options:

a	1.7 x 1014 m/s2, directly toward the bead.
b	2.9 x 10-13 m/s2, directly toward the bead.
c	3.2 x 1017 m/s2, directly away from the bead.
d	3.2 x 1017 m/s2, directly toward the bead.
e	zero

Answer 1

Provifing the solution of c and d ...

Atomic no. of an atom is the total number of protono present in an atom option-dio Corred e bois 21=+2010. f. -1.6x10-190 x=lom. Glass bead of → force on electron = K2, 22 = {9x109920x10ry of terpan { 1.6*10-1964 (= 288x17 R5Proseja acceleration of electron - f = 288 xloths N Jo tall me 9.1 x 10-31 = 31.64 x 106 = 3.2x107 m/s2 → This acceleration of electron is towards the. bead option -d is correct