<span>because with a longer chain you are giving the hammer momentum so it will take more strength to move</span>
Answer:
3
Explanation:
If there is 3 at the moment (atm) is the same as might be (mb) in the air.
Go to your page of the question and take a picture of the question and post it so we can see the choices it it will be more easy for us
Answer:
It would be A or a speed skater moving at an increasing speed on a straight track
Explanation:
the reasoning behind this is that the speed skater is getting faster or is accelerating.
Answer:
a) 24 J
b) Gravitational Force
c) 45 J
d) 0
e) 6.782m/s
Explanation:
a) m = 3kg
v = 4m/s
h = 1.5m
KE = ?
0.5 * 3 * 16 = 24J
b) Gravitational force
c) F = ma = 3 * 10 = 30N
Work done = Force * distance = 30 * 1.5 = 45J
d) Final Kinetic Energy of the ball is zero because the ball eventually stops moving
e) velocity of ball as it strikes the ground = v
where
v is the velocity as it strikes the ground
u is the initial velocity
a is acceleration
s is the distance
Now since the ball is thrown downwards, a is positive because the velocity of the ball is increasing as the gravitational force acts on it
u = 4m/s
a = 10
s = 1.5
=> ![v = \sqrt{2as + u^{2} }](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B2as%20%2B%20u%5E%7B2%7D%20%7D)
= ![\sqrt{(2*10*1.5) + 16}](https://tex.z-dn.net/?f=%5Csqrt%7B%282%2A10%2A1.5%29%20%2B%2016%7D)
= ![\sqrt{46} = 6.782m/s](https://tex.z-dn.net/?f=%5Csqrt%7B46%7D%20%3D%206.782m%2Fs)