Please help with these i dont know how to do them

Physics

1 answer:

Svetradugi [14.3K]4 years ago

3 0

20.0M/S. IS THE HORIZONTAL VELOCITY OF THE BALL JUST BEFORE IT REACHES THE GROUND

12.2 SECONDS IS THE APPROXIMATE TOTAL TIME REQUIRED FOR THE BALL

You might be interested in

Which statement about ocean surface currents is false.

Lynna [10]

B.) They have no effect on air temperature over land on the coast.

Explanation:

The statement that ocean surface currents do not have any effect on air temperature over land on the coast is very incorrect.

In fact, ocean surface currents shapes the coast a whole lot.

There is a constant interaction between the ocean surface current and the air masses on land.
They interact by simple convection through which heat is transferred from one point to the other.
During the day, air masses moves from the land to the ocean because air around the coast are hotter and less dense.
They are quickly replaced by colder and less denser air from the ocean.
At night the reverse is the case.

learn more;

Ocean and atmosphere brainly.com/question/1851697

#learnwithBrainly

7 0

3 years ago

Three forces act on a moving object. One force has a magnitude of 83.7 N and is directed due north. Another has a magnitude of 5

LekaFEV [45]

Answer:

$|\vec{F}_3| = 102.92 \ N$

$\theta = 57 \° 24 ' 48''$

Explanation:

For an object to move with constant velocity, the acceleration of the object must be zero:

$\vec{a} = \vec{0}$ .

As the net force equals acceleration multiplied by mass , this must mean:

$\vec{F}_{net} = m \vec{a} = m * \vec{0} = \vec{0}$ .

So, the sum of the three forces must be zero:

$\vec{F}_1 + \vec{F}_2 + \vec{F}_3 = \vec{0}$ ,

this implies:

$\vec{F}_3 = - \vec{F}_1 - \vec{F}_2$ .

To obtain this sum, its easier to work in Cartesian representation.

First we need to define an Frame of reference. Lets put the x axis unit vector $\hat{i}$ pointing east, with the y axis unit vector $\hat{j}$ pointing south, so the positive angle is south of east. For this, we got for the first force: