Answer:
Length of the stake will be 0.3623 m
Explanation:
We have given energy required to fully drive a stake into ground = 0.30 KJ = 300 J
Average resistive force acting on the floor is equal to F = 828 N
We have to find the length of the stake
We know that work done is given by
W = Fd, here W is work done , F is average force and d is the length of the stake
So 300 = 828×d
d = 0.3623 m
So length of the stake will be 0.3623 m
Refer to the diagram shown below.
μ = 0.2. the coefficient of dynamic friction
N = mg cosθ, the normal reaction
μN = μmg cosθ, the frictional force resisting motion down the inclined plane.
mg sinθ = the force driving the block down the inclined plane.
Because the block slides down the inclined plane with constant velocity, it is in dynamic equilibrium.
Therefore
mg sinθ = μmgcosθ
tanθ = μ = 0.2
θ =tan⁻¹ 0.2 = 11.3°
Answer: 11.3°
<span>The reason that things look wavy in the heat over a hot grill or stove is that the air temperature is not stable. Hot air naturally rises, so as air comes off the hot surface, it rises for a bit before rapidly cooling and sinking to be heated again. This constant mixing of hot and cool air produces vibration. This vibration affects how we see the light moving through the air, making it look wavy.</span>
Infrared radiation - Greenhouse gases in the atmosphere absorb most of the earth's emitted infrared radiation which heats the lower atmosphere