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3 years ago

PLEASE HELP WILL MARK AS BRAINLIEST!!!!

Physics

1 answer:

solmaris [256]3 years ago

3 0

Answer:

1st one goes to the first one the second one goes to the first one the thired one goes to the second one the forth one goes to the second one and the fifth one goes to the first one.

Explanation:

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A light-rail train going from one station to the next on a straight section of track accelerates from rest at 1.1m/s^2 for 20s.

SSSSS [86.1K]

Answer:

A.) 1430 metres

B.) 80 seconds

Explanation:

Given that the train accelerates from rest at 1.1m/s^2 for 20s. The initial velocity U will be:

U = acceleration × time

U = 1.1 × 20 = 22 m/s

It then proceeds at constant speed for 1100 m

Then, time t will be

Time = distance/ velocity

Time = 1100/22

Time = 50 s

before slowing down at 2.2m/s^2 until it stops at the station.

Deceleration = velocity/time

2.2 = 22/t

t = 22/2.2

t = 10s

Using area under the graph, the distance between the two stations will be :

(1/2 × 22 × 20) + 1100 + (1/2 × 22 × 10)

220 + 1100 + 110

1430 m

The time taken between the two stations will be

20 + 50 + 10 = 80 seconds

6 0

3 years ago

A rectangular trough, 2.0 m long, 0.70 m wide, and 0.40 m deep, is completely full of water. One end of the trough has a small d

Stella [2.4K]

Answer:

speed does water emerge from the hole v= 2.8 m/sec

Explanation:

the depth of the rectangular trough h = 0.40 m full of water

Also, given One end of the trough has a small drain plug right at the bottom edge.

we have to find the speed does water emerge from the hole.

This can be done using law of conservation of energy

the potential energy of water will be converted into kinetic energy as

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

⇒ $v= \sqrt{2gh}$

h= depth, g= acceleration due to gravity and v= velocity of water from the hole

plugging the values

$v= \sqrt{2\times9.81\times0.40}$

v= 2.8 m/sec

8 0

4 years ago

How much work do you do when you push a 400 kg car for 6 m with a force of 300 N? What is the car’s final speed if all your work

Anit [1.1K]

Answer:

Work=1800 J

Speed=3m/s

Explanation:

Work is product of force and distance moved, expressed as

W=Fd

Where F is force and d is distance in meters

Substituting 300 N for force and 6 m for d then

W=300*6=1800 J

Kinetic energy is given by

KE=½mv²

Where m is the mass and v is velocity

Here, KE=W hence

W=½mv²

Making v the subject then

$v=\frac {2W}{m}$

Substituting 1800J for W and 400 kg for m then

$v=\frac {2*1800}{400}=3m/s$

Therefore, velocity is 3 m/s

4 0

3 years ago

When a high‑energy photon passes near a heavy nucleus, a process known as pair production can occur. As a result, an electron an

shtirl [24]

Answer:

1.47*10^{-8}s

Explanation:

You first calculate the distance traveled by the electron:

$x=vt\\\\x=(0.941(3*10^8m/s))(15.7*10^{-9}s)=4.43m$

Next, you calculate the relative speed as measure by an observer in the positron, of the electron:

$u'=\frac{u+v}{1+\frac{uv}{c^2}}\\\\u'=\frac{0.941c+0.941c}{1+\frac{(0.941)^2c^2}{c^2}}\\\\u'=0.99c$

with this relative velocity you calculate the time:

$t=\frac{x}{u'}\\\\t=\frac{4.43m}{0.99c}=1.47*10^{-8}s$

4 0

4 years ago

In which physical state would a water molecule most likely have the least energy?

mario62 [17]

Thinking back to my classes from last year, I'm pretty sure it's gas as the cells move faster and are spread apart more than in a solid form.

3 0

3 years ago

Read 2 more answers