This is because the 15 N forces from the left and right cancel out, leaving only the upwards 15 N force, and the 12 N force. However, we have to subtract 12 from 15, leaving the final net force to be 3 N Up.

Let me know if this helps!

3 0

2 years ago

A feather and a minivan are dropped vertically downward from a height of twenty meters and both are subject to air drag as they

Luda [366]

Answer:

maybe C i'm not 100% sure

I'm sorry if this didn't help

Explanation:

6 0

2 years ago

A pendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 2.1 m. The maximum angle the str

just olya [345]

Answer:

The speed of the object at the lowest point in its trajectory is:

$v=2.34\: m/s$

Explanation:

We can use the conservation of energy between the maximum point of swing and the lowest point of the pendulum.

$P=K$

$mgh=\frac{1}{2}mv^{2}$ (1)

Where:

h is the height of the object at 30° with the vertical.
v is the speed at the lowest point.

We can find h using trigonometry.

$h=L-Lcos(30)=L(1-cos(30))$

$h=2.1(1-cos(30))=0.28\: m$

Now, using equation (1) we can find v.

$gh=\frac{1}{2}v^{2}$

$2gh=v^{2}$

$v=\sqrt{2gh}$

$v=\sqrt{2(9.81)(0.28)}$

$v=2.34\: m/s$

I hope it helps you!

8 0

2 years ago