B.
This is because a hypothesis is an explanation explaining things
Answer:
v = 2.94 m/s
Explanation:
Given that,
Mass of anvil, m = 15 kg
The gravitational potential energy relative to the floor, P = 65 J
We need to find the speed just before it hits the floor when the Anvil is released. Let it is v.
We can use the conservation of energy.
So, the required speed is 2.94 m/s.
Answer: 60m/s
Explanation:
From the diagram:
Θ = 30°
Vertical resolution (y-axis) :
Voy = VoSinΘ
g in the upward direction = negative (-) = - g
Vfinal = 0
Distance (H) traveled along y =
Time taken to reach maximum height :
From v = u + at
0 = usinΘ - gt
gt = usinΘ
t = usinΘ / g
Horizontal resolution:
S = ut + 1/2at^2
Substituting t = usinΘ / g ; Voy = usinΘ
S = (usinΘ × usinΘ / g) - 1/2 g × (usinΘ /g)^2
S = (u^2sin^2Θ / g) - (u^2sin^2Θ / 2g)
S = (u^2sin^2Θ) / 2g
Now if S = maximum height = 45m
Then,
45 = [Vo^2sin^2(30°)] / 2(10)
45 =[ Vo^2 * (0.5)^2] / 20
45 =( Vo^2 * 0.25) / 20
20 * 45 = Vo^2 * 0.25
900 / 0.25 = Vo^2
3600 = Vo^2
Vo = sqrt(3600)
Vo = 60m/s
I believe the answer should be C!
The coefficient of static friction is a measure of how difficult it is to get two surfaces to start sliding against each other. It is defined as the minimum force required to get the surfaces to start sliding, divided by the force pressing the two surfaces together.
Hope this helped! If not, ask a teacher for help!