why does static electricity, the buildup of charge on a material's surface, occur in insulating material
1 answer:
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Answer:
-1 m/s
Explanation:
From the law of conservation of linear momentum, the sum of initial and final momentum should be equal. Momentum, p is expressed as the product of mass and velocity. Therefore, p=mv where m and v represent mass and velocity respectively. In this case
Where subscripts d and u represent downwards and upwards respectively while c is common hence common velocity which is unknown in this case. Taking downwards as negative while upwards as positive then substituting -3 m/s for downward speed while 3 m/s for upward speed, the masses as given then
(2*-3)+(1*3)=(2+1)v
V=-1 m/s hence downward direction
Answer:
vₓ = 6.73 m/s
Explanation:
- Assuming no other external influences than gravity, in the horizontal direction (which we make to coincide with the x- axis) , speed is constant, so, applying the definition of average velocity, we can write the following equation:
- Now, in the vertical direction (coincident with the y- axis) , as both movements are independent each other, initial velocity is zero, so we can write the following equation for the vertical displacement:
- where Δh = -37.0 m , g = -9.8 m/s2
- Solving (2) for t, we get:
- Taking t₀ = 0, ⇒ Δt = t
- Replacing (3) in (1), we get:
- As the horizontal velocity is constant, the initial horizontal velocity is just the average one, i.e., 6.73 m/s.