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4 years ago

Help me again I am hopeless

Physics

2 answers:

mr_godi [17]4 years ago

6 0

Answer:

k first of all, ur not hopeless. everyone needs a bit of help some time.

Explanation:

The answer should be B.

This is because we can learn with new technology and data and evidence how we can change or fix an old theory that may have been made a long time ago. For example, with new data, we can learn and change our old ideas that were made years ago. Now, our data can be more precise. Therefore, our ideas and theories will also change as data changes.

makvit [3.9K]4 years ago

5 0

The Answer Is B

explaining;

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5. A simple bridge of 36.5 m length has two concrete supports, one on each end. A car drives across the bridge and stops 10.2 m

Minchanka [31]

Answer:

X = 2.882×10⁵ N,

Y = 1.43×10⁴ N

Explanation:

From the diagram attached,

Let the reaction from the two support be X and Y.

According to the condition of equilibrium

Sum of upward force = sum of downward force.

X+Y = 5.25×10⁴+2.5×10⁵

X+Y = 3.025×10⁵.............................. Equation 1

Also,

Sum of clockwise moment = sum of anticlockwise moment.

Take the moment about support A

(10.2×5.25×10⁴)+(18.25×2.56×10⁵) = 36.5×Y

52.075×10⁴ = 36.5Y

Y =52.075×10⁴/36.5

Y = 1.43×10⁴ N.

Substituting the value of Y into equation 1

X+ 1.43×10⁴ = 3.025×10⁵

X = 3.025×10⁵-1.43×10⁴

X = 2.882×10⁵ N.

Hence the force provided by each supports are

X = 2.882×10⁵ N, and Y = 1.43×10⁴ N

3 0

4 years ago

A plane's average speed between two cities is 625 km/hr. If the trip takes 2.5 hours, how far does the plane fly?

Vladimir79 [104]

Answer: 1,562.5 Km

Explanation: If it takes one hour to travel 625 kilometers, then, in two and a half hours, you should travel 1,562.5 Kilometers because of 625x2.5=1562.5 kilometers

6 0

3 years ago

When two bodies of different temperatures are placed together and left for sometime, Both of them attain the same temperature.

NikAS [45]

hi olivia hope this helps you

3 0

3 years ago

A speed boat increases its speed uniformly from vi = 20.0 m/s to vf = 30.0 m/s in a distance of 2.00 x 10^2m. (a) Draw a coordin

pychu [463]

a) See graph in attachment

b) The suvat equation to use is $v_f^2 - v_i^2 = 2as$

c) The acceleration is $a=\frac{v_f^2-v_i^2}{2s}$

d) The acceleration is $1.25 m/s^2$

e) The time needed is 8 s

Explanation:

For this part, find in attachment the diagram representing this situation.

Since we are not given any particular direction for the motion, we choose the x-direction as the direction of motion of the boat.

Then we have the following:

- The initial position of the boat is $x_i = 0$ , the origin

- The final position of the boat is $x_f = 200 m$

- The initial velocity of the boat is $v_i = 20.0 m/s$

- The final velocity of the boat is $v_f = 30.0 m/s$

Note that the arrow representing the final velocity is longer than that of the initial velocity, since the final velocity is larger.

The motion of the speed boat is a uniformly accelerated motion (motion at constant acceleration), therefore we can use one of the suvat equations. In this particular problem, we know the following quantities:

$v_i = 20.0 m/s$ , the initial velocity

$v_f = 30.0 m/s$ , the final velocity

$s = x_f - x_i = 200 m$ , the displacement of the boat

Therefore, the equation that best can be use to find the acceleration is

$v_f^2 - v_i^2 = 2as$

where

$a$ is the acceleration

Now we have to solve the equation

$v_f^2 - v_i^2 = 2as$

In order to find the acceleration.

This can be done by dividing both terms by $2s$ : this way, we find

$\frac{v_f^2-v_i^2}{2s}=\frac{2as}{2s}$

And so the acceleration is

$a=\frac{v_f^2-v_i^2}{2s}$

Now we can use the equation found in part c) in order to find the acceleration.

We have the following data:

$v_i = 20.0 m/s$ , the initial velocity

$v_f = 30.0 m/s$ , the final velocity

$s = x_f - x_i = 200 m$ , the displacement of the boat

And substituting into the equation,

$a=\frac{30^2-20^2}{2(200)}=1.25 m/s^2$

In order to find the time it takes the boat to travel the given distance, we can use the following suvat equation:

$v_f = v_i + at$

where:

$v_i$ is the initial velocity

$v_f$ is the final velocity

a is the acceleration

t is the time

Here we have:

$v_i = 20.0 m/s$

$v_f = 30.0 m/s$

$a=1.25 m/s^2$

Solving for t, we find:

$t=\frac{v_f-v_i}{a}=\frac{30-20}{1.25}=8 s$

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8 0

4 years ago

as the video shows, the star begins its life from a clump of gas that heats up as it contracts. where does the energy that heats

MAXImum [283]

When water vapor condenses during the formation of clouds, energy is released into the atmosphere through the process of latent heating.

Huge amounts of solar energy are absorbed during the evaporation process. There is no thermal equilibrium in protostars. They emit radiation that causes them to lose energy, but their interior temperatures aren't hot enough to start nuclear fusion to replenish the energy. They consequently tighten and warm up. Fusion can replace the energy they are losing once they are heated enough on the inside (about 107 K). The gas atoms start to collide more and get closer together as the cloud gets smaller, which warms them up. The cloud keeps shrinking and heating up until the force of gravity is balanced by the pressure from the heat.

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2 years ago