Newtons 3.law: Action = Reaction
If a body exerts a force on a rope of 400 N the rope exerts a force on the body of 400N also. So the tension in the rope is 400N. See pictures below.
Answer:
A
Explanation:
The most important part about this is not only that objects pull on each other, but that two objects attract each other with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them. This is known as Newton's law of universal gravitation.
Vertically we can say
<span>Vertical acceleration = - g </span>
<span>Vertical velocity = u sinѲ - gt [Ѳ = 42; u = 12 m/s] </span>
<span>Vertical displacement = u sinѲt - (1/2) g t^2 + 9.5 </span>
<span>When the rock hits the ground, its vertical displacement will be zero. So we can say.. </span>
<span>u sinѲt - (1/2) g t^2 + 9.5 = 0 </span>
<span>I'll rearrange this .... </span>
<span>- (1/2) g t^2 + u sinѲt + 9.5 = 0 </span>
<span>Can you see that we now have a quadratic in t? </span>
<span>Using the well known formula </span>
<span>t = [ - u sinѲ ± √( u^2 sin^2Ѳ - 4(( - (1/2)g * 9.5))] / (- g) </span>
<span>t = [- u sinѲ ± √( u^2 sin^2Ѳ + 19g)] / (-g) </span>
<span>t = [- 8.03 ± √(250.86)] / (-9.81) </span>
<span>t = [- 8.03 ± 15.84] / (-9.81) </span>
<span>t = (- 8.03 + 15.84) / (-9.81) or t = (-8.03 - 15.84) / (-9.81) </span>
<span>t = - 0.8 or t = 2.43 </span>
<span>Well, a negative time has no meaning so </span>
<span>t = 2.43 seconds. </span>
1,000 milligrams = 1 gram
2,000 milligrams = 2 grams
3,000 milligrams = 3 grams
4,000 milligrams = 4 grams
12. 12m / 1 sec =12•30s=360 total tance he travels was 360 Miles