Answer:
b
Explanation:
this is because inoder. for combustion or burning to take place oxygen must be available
Answer:
v = 17.66 m/s
Explanation:
As we know that the lower end of the pole is fixed in the ground and it start rotating about that end
so here we can say that the gravitational potential energy of the pole will convert into rotational kinetic energy of the pole about its one end
so we have

so we have

now we have


now the speed of the other tip of the pole is given as


Answer:
340 W
Explanation:
Power = change in energy / change in time
P = ΔKE / Δt
P = ½ mv² / Δt
P = ½ (90 kg) (15 m/s)² / (30 s)
P = 337.5 W
Rounded to 2 significant figures, the power is 340 W.
Answer:
a)T= mg/2
b) T = 31. 88 N
c)Tension will increase
Explanation:
Given that m= 6.5 Kg
a)
The force due to gravity = m g
The tension in the chain = T
The total tension = 2 T
By balancing force in vertical direction
2 T = m g
T= mg/2
b)
2 T = m g
2 x T = 6.5 x 9.81
T = 31. 88 N
c)
Lets take angle made by chain is θ
So the total tension in vertical direction = 2 T cos θ
2 T cos θ = m g
T= mg/(2cos θ)
It means that tension will increase because cos θ is always less than 1.