Answer:
13.5 m
Explanation:
First, convert km/h to m/s:
64 km/h × (1000 m / km) × (1 h / 3600 s) = 17.8 m/s
Distance = rate × time
d = 17.8 m/s × 0.761 s
d = 13.5 m
Answer:
a) 
b) west end of the bar is positive.
Explanation:
Given:
- emf induced in the bar,
- length of the bar,
- velocity of the bar at the given instant,
(a)
The magnitude of the horizontal component of the Earth's magnetic field(B):
We know:
(b)
Using Fleming's left hand rule we determine that the current is flowing towards east end of the bar i.e. west end of the bar is positive.
Radius of Earth is given as
now here the height from the surface of earth is same as that of radius
now here the acceleration due to gravity at this height is given as
now the force of gravity on the given object will be
<em>so the force of gravity on it is 1.225 N</em>
Explanation:
In brief, electrons are negative charges and protons are positive charges. An electron is considered the smallest quantity of negative charge and a proton the smallest quantity of positive charge.
Two negative charges repel. Also, two positive charges repel. A positive charge and a negative charge attract each other (all experimentally verified.)
Point Charge: An accumulation of electric charges at a point (a tiny volume in space) is called a point charge.
Note: When an atom loses an electron, the separated electron forms a negative charge, but the remaining that contains one less electron or consequently one more proton becomes a positive charge. A positive charge is not necessarily a single proton. In most cases, a positive charge is an atom that has lost one or more electron(s).
