A- electric forces only - WHEN The force exerted on a stationary charged object is nonzero.
B- magnetic forces ONLY - The magnitude of the force depends on the charged object's direction of motion.
C- both electric and magnetic forces - The force is proportional to the magnitude of the charge of the object on which the force is exerted.
D- neither electric nor magnetic forces- The force exerted on a moving charged object is zero.
(vi)- The force exerted on a charged object is proportional to its speed- magnetic forces only
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Full Question:
Why do we use other bonding theories in addition to the lewis model?
a) Lewis model is not suitable for all molecules or ions. b) Lewis model cannot predict all of the properties of a molecule or ion. c) Lewis model is too complicated.
Answer:
b) Lewis model cannot predict all of the properties of a molecule or ion.
Explanation:
Lewis structures, also called electron-dot structures or electron-dot diagrams, are diagrams that show the bonding between atoms of a molecule, and the lone pairs of electrons that may exist in the molecule.
Lweis model does not explain the geometry of molecules, how the bonds form, or how the electrons are shared between the atoms hence the need to use other bonding theories.
Answer:9.51 m/s
Explanation:
Given
Window is 4.35 m above ground
time taken=1.2 s
Let u be the initial velocity of keys
where s=distance traveled
u=initial velocity
t=time taken
g=acceleration due to gravity
(b)velocity of keys just before they were caught
v=u+at
v=-2.26 m/s
Here negative sign indicates downward motion of keys
Answer:
Use the potential energy formula
Explanation:
PE=mgh
m=mass=2kg
g=gravitational force=-10
h=height=10m
