Answer:
i dont know why are u asking me
Explanation:
Answer:
the vibrations
Explanation:
they cause the window to shake
That statement is flase. The index of refraction
of every material is more than 1.0 .
The ball can't reach the speed of 20 m/s in two seconds, unless you THROW it down from the window with a little bit of initial speed. If you just drop it, then the highest speed it can have after two seconds is 19.6 m/s .
If an object starts from rest and its speed after 2 seconds is 20 m/s, then its acceleration is 20/2 = 10 m/s^2 .
(Gravity on Earth is only 9.8 m/s^2.)
Verrrrry interesting question !
Force= (mass) x (acceleration)
(49.5kg) x (1.3 m/s²) =
<u> Net</u> force on the box is <u>64.25 newtons upward</u>.
That's the <u>net</u> force. It's the combination of the tension in the rope
pulling the box up, and the force of gravity pulling the box down.
Force of gravity = "weight" = (mass) x (gravity) =
(49.5) x (9.8) = <u>485.1 newtons downward</u>
The tension in the rope must be enough to balance the downward force
of gravity PLUS provide another 64.25 newtons upward.
<em>Tension =</em> (485.1) + (64.25) = <em>549.35 newtons</em>
