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2 years ago

ONLY answer if you know FOR SURE. if your not 100% on it, DONT FREAKING ANSWER. ONLY IF YOU KNOW FOR SURE!

Physics

1 answer:

Katena32 [7]2 years ago

6 0

Answer: the answer is (C)

Explanation: Bar graphs show comparisons using number comparisons

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What color is the moon

Inessa [10]

The color for the moon is gray because if you would look outside when it is dark you would see the moon cloor gray

5 0

4 years ago

Read 2 more answers

Suppose you find yourself in your friend's third floor apartment building when you smell smoke coming from outside the door. you

Alborosie

(a) Because the tension in the rope would be larger than the maximum value allowed

When you are sliding down the slope, there are two forces acting on you:

- Your weight, $W=mg$ , acting downward, where

m = 70 kg is your mass

g = 9.8 m/s^2 is the acceleration of gravity

- The tension in the rope, T, acting upward

Therefore, the equation of motion is

$T-mg=ma$

where a is the acceleration.

If you want to slide at constant speed, then the acceleration must be zero:

$a = 0$

And so the equation becomes

$T-mg=0$

This means that the tension in the rope must be:

$T=mg=(70 kg)(9.8 m/s^2)=686 N$

Which is larger than the maximum tension allowed in the rope (500 N), so the rope will break.

(b) $2.66 m/s^2$ downward

Again, we must refer to the equation of the forces:

$T-mg=ma$

In this case, we want the tension in the rope to be the maximum allowed value,

T = 500 N

the other data are

m = 70 kg is your mass

g = 9.8 m/s^2 is the acceleration of gravity

Substituting into the equation, we can find the corresponding value of acceleration:

$a=\frac{T-mg}{m}=\frac{500-(70)(9.8)}{70}=-2.66 m/s^2$

where the negative sign means the acceleration is downward.

8 0

4 years ago

Plastic foam is about 0.10 times as dense as water. What weight of bricks could you stack on a 1m x 1m x 0.10m slab of foam, so

goblinko [34]

Answer: Weight = 98.1N

Explanation:

Density of water = 1000 kg/m^3

Given that the Plastic foam is about 0.10 times as dense as water. That is,

Density of plastic foam = 0.1 × 1000 = 100kg/m^3

The volume V = 1 ×1×0.1 = 0.1 m^3

Density is the ratio of mass to volume

Density = mass/volume

Let us substitute for density and volume to get mass.

100 = M/0.1

Make M the subject of formula

M = 100 × 0.1 = 10 kg

Weight = mg

Where g = 9.81 m/s

Substitute the M and g into the formula

Weight = 10 × 9.81 = 98.1 N

Therefore, the weight of the brick is 98.1 N

4 0

4 years ago

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

How do you calculate the surface area and pressure in hydraulics in slave and master pistons using this example? E.g. master pis

frutty [35]

Explanation:

The pressure on the master piston = the pressure on the slave piston

P₁ = P₂

Pressure is force divided by area:

F₁ / A₁ = F₂ / A₂

Here, F₁ = 20 N, A₁ = 10 cm², and F₂ = 60 N.

(20 N) / (10 cm²) = (60 N) / A₂

A₂ = 30 cm²

7 0

3 years ago