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3 years ago

Question 1

Physics

1 answer:

OLEGan [10]3 years ago

8 0

Answer:

Fossil fuels formed over millions of years and they are being used more quickly than they can be replaced.

Explanation:

The best reason why he use of fossil fuels should be limited is that fossil fuels formed over millions of years and they are being used more quickly than they can be replaced.

Fossil fuels contains a very rich energy which is trapped within the carbon atoms and are obtained during combustion.

It takes several geologic years for the fuels to form. On the other hand, our current rate of consumption of fossil fuels cannot be sustained because, consumption cannot be matched with the formation.

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PLEASEE HELPP ME

Mila [183]

Answer:

F = 2(50 N) - (50 N) = 50 N

Explanation:

The direction of F is the direction in which the two students are pushing.

3 0

2 years ago

What accounts for most of the mass in the universe?

aev [14]

Around 80 percent of the mass of the universe is made up material known as "Dark matter". It does not emit light or energy but the influence of it can be detected or observed gravitationally. Motions of stars and galaxy tell us how much mater there is, but somehow the speed of rotation of galaxy does not add up to its mass alone, there is a certain amount of matter really not accounted for. Dark matter maybe made up of non-baryonic matter, or perhaps what scientist called the WIMPS or (weakly interacting massive particles.)

5 0

3 years ago

Two long, parallel wires carry currents of different magnitudes. if the amount of current in each wire is doubled, what happens

Mrac [35]

The force per unit of length between two wires carrying current is
$\frac{F}{L}= \frac{\mu_0 I_1 I_2}{2 \pi r}$
where I1 and I2 are the currents in the two wires, while r is the distance between them.

We can see from the formula that the force is proportional to the product between I1 and I2: $F \sim I_1 I_2$
so, if we double both I1 and I2, we get a factor 4:
$F' \sim (2I_1 )(2I_2)=4 I_1 I_2 =4 F$
so, the force between the wires will be 4 times the original value.

4 0

3 years ago

3. El tambor de una lavadora que gira a 3 000 revoluciones por minuto (rpm) se acelera uniformemente hasta que alcanza las 6 000

cestrela7 [59]

Answer:

d) α = 1693.5 rad / s² , a = 392.7 m / s² , a_total = α √(R² +1) ,

e) tan θ = a / α

Explanation:

This is an exercise in linear and angular kinematics.

We initialize reduction of all the magnitudes to the SI system

w₀ = 3000 rev / min (2π rad / 1rev) (1min / 60s) = 314.16 rad / s

w = 6000 rev / mi = 628.32 rad / s

θ = 12 rev = 12 rev (2π rad / 1 rev) = 75.398 rad

d) ask for centripetal, tangential and total acceleration.

Let's start by looking for centripetal acceleration, let's use the formula

w² = w₀² + 2 α θ

α = (w²- w₀²) / 2θ

we calculate

α = (628.32²2 - 314.16²) / 2 75.398

α = 1693.5 rad / s²

the quantity is linear and angular are related

the linear or tangential acceleration is

a = α R

where R is the radius of the drum

a = 1693.5 R

Unfortunately you do not give the radius of the drum for a complete calculation, but suppose it is a washing machine drum R = 20 cm = 0.20 m

a = 1693.5 0.20

a = 392.7 m / s²

the total acceleration is

a_total = √(a² + α²)

a_total = √ (α² R² + α²)

a_total = α √(R² +1)

e) The centripetal acceleration is directed towards the center of the movement is radial and its magnitude is constant

Tangential acceleration is tangency to radius and its value varies proportionally radius

the total accelracicon is the result of the vector sum of the two accelerations and their directions given by trigonometry

tan θ = a / α

the angular velocity increases linearly when with centripetal acceleration

8 0

3 years ago

Suppose that you purchased a water bed with the dimensions 2.55 m Ã 2.53 dm Ã 245 cm. what mass of water does this bed contain

Nadya [2.5K]

dimensions of the bed is given as

$length = 2.55 m$

$thickness = 2.53 dm = 0.253 m$

$width = 245 cm = 2.45 m$

now the volume of the bed is given as

$V = 2.55 * 0.253 * 2.45 m^3$

$V = 1.581m^3$

now the mass of water in it is given as

$mass = density * volume$

$mass = 1000* 1.581$

$mass = 1581 kg$

<em>so it will contain 1581 kg mass in it</em>

6 0

3 years ago