Answer:
The first law of thermodynamics is the law of conservation of energy. It states that energy is always conserved. ... To keep a machine moving, the energy applied should stay with the machine without any losses. Because of this fact alone, it is impossible to build perpetual motion machines.
Explanation:
1. What does PE stand for? Physical Education
2. Name one common PE exercise? Your choice A knee push up B piano keys
Answer:
Explanation:
The magnitude on the charge at the bottom-left corner due to the charge on the top vertex of the triangle will act along the +ve x-axis and the +ve y-axis.
From Coulomb's law the magnitude of the forces on the charge at the bottom-left corner, due to the charge on the top vertex of the triangle are cos 60, and
The magnitude on the charge due to the charge at the bottom-right corner will only act in the -ve x-axis, since they repel each other (like charges repel). The magnitude is
The angle made by the upper charge to the charge we're considering is 60° with the horizontal.
The total force on the charge along the x-axis is
= cos 60 -
= -
==> -
For the y-axis, we have
= sin 60
=
The resultant force is
The common factors between the two x-axis force, and the y-axis force is
, we put this outside the square root (squaring this and square rooting will give us the initial value)
=
=
==>
the magnitude of the electric force on the charge at the bottom left-hand vertex of the triangle due to the other two charges is
=
Answer:
Explanation:
Given
Distance between home and school is 39 km
Total time taken
i.e.
Total Distance traveled =39+39+39=117 km
displacement=39 km
Thus Average speed
Average velocity
Answer:
v2 = 12m/s
Explanation:
To find the velocity of water in the lower tube you use the following formula:
(1)
v1: velocity in the first tube
v2: velocity in the second tube
A1: area of the first tube
A2: area of the second tube
From the expression (1) you can obtain the velocity v2, that is the velocity of water in the second tube:
you replace the values of the parameter in order to calculate v2:
hence, the velocity of the water is 12m/s