The helper T cells are vital in coordinating the activity of the immune response. They secrete chemical messages known as cytokines to stimulate the non-specific immune response to continue, to strengthen and to boost appropriate specific responses. They are sometimes called conductors like that of an orchestra because they coordinate or orchestrate immune system activities. Furthermore, they are also called "generals" because they assemble the B cells, cytotoxic T cells and other helper T cells troops to attack the invading pathogens.
Always wear your proper safety restraints (or seat-belts)
Answer:
The speed of m2 is 0.6 m/s and its direction is to the right.
Explanation:
This numerical can be solved easily by applying law of conservation of momentum to it. According to law of conservation of momentum:
Total Momentum Before Collision = Total Momentum After Collision
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
where,
m₁ = Mass of 1st air glider = 0.25 kg
m₂ = Mass of 2nd air glider = 0.5 kg
u₁ = Speed of 1st air glider before collision = 0.9 m/s
u₂ = Speed of 2nd air glider before collision = 0 m/s (at rest)
v₁ = Speed of 1st air glider after collision = - 0.3 m/s (negative sign due to change in direction of velocity)
v₂ = Speed of 2nd air glider after collision = ?
Therefore,
(0.25 kg)(0.9 m/s) + (0.5 kg)(0 m/s) = (0.25 kg)(-0.3 m/s) + (0.5 kg)v₂
0.225 kg.m/s + 0.075 kg.m/s = (0.5 kg)v₂
v₂ = (0.3 kg.m/s)/(0.5 kg)
<u>v₂ = 0.6 m/s</u>
Positive sign indicates that v₂ <u>is directed towards right</u>
Answer:
FALSE
Explanation:
an electric field has both magnitude and direction. it also has strength