Answer: The kinetic energy in physics can be defined as the energy possessed by the body when it is in motion relatively to the other bodies. This energy depends on the mass of the body and the square of the velocity. Its measurable unit is in Joules.
Answer and Explanation:
Given data:
The electric field is
E
=
1000
N
/
C
The initial kinetic energy of the ejected electrons is
k
=
3
e
V
=
(
3
×
1.6
×
10
−
19
)
J
The expression for the conservation of energy of the electrons is given by
k
=
U
p
k
=
e
V
Here
U
p
=
e
V
is the potential energy of the electron
Here
V
=
E
d
is the electric potential in electric field
Here
e
=
1.6
×
10
−
19
C
is the charge of the electon
Substituting the values in the above equation as,
k
=
q
V
k
=
e
(
E
d
)
(
3
×
1.6
×
10
−
19
J
)
=
(
1.6
×
10
−
19
C
)
(
1000
N
/
C
)
×
d
d
=
0.003
m
d
=
3
m
m
Explanation:
<h2>
Energy used by heater is 8.21 x 10⁶ J</h2>
Explanation:
Energy = Power x Time
Power = Voltage x Current
Voltage = 120 V
Current = 9.5 A
Power = Voltage x Current
Power = 120 x 9.5 = 1140 W
Time = 2 hours = 2 x 60 x 60 = 7200 s
Energy = Power x Time
Energy = 1140 x 7200
Energy = 8208000 J
Energy used by heater is 8.21 x 10⁶ J
When temperature decreases the atoms(or molecules) within the substance begin to slow down.
10+8 = 18
5+2 = 7
18-7 = 11
a) to the right by 11N.
Vertical component = 2.25 N downward
Horizontal component = 1.05 N to the right
Magnitude of the net force = √ (2.25² + 1.05²)
= √6.165 = 2.483 N (rounded)
Direction of the net force = tan⁻¹ (1.05/2.25) to the right of downward
= tan⁻¹ ( 7/15 ) to the right of downward
= 25° to the right of downward (rounded)
