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3 years ago

Which three statements are true of all matter?

Physics

1 answer:

Snezhnost [94]3 years ago

8 0

Answer:

B, D and E, not all matter can be filled with air

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how difficult is it to start a heavy lorry moving and to stop it moving? (choose one answer from the image provided)

ale4655 [162]

Answer:

option B

Explanation:

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3 years ago

How can Magnets cause objects to have kinetic energy?

lianna [129]

Answer:

If there is a system of magnets being held in place, there is potential energy. When you let go, the potential energy converts to kinetic energy and the magnets move. Putting the system of magnets close together which creates an opposing force.

Explanation:

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3 years ago

Read 2 more answers

Like the filters falling through the air, a car on the freeway represents an object with a high Reynolds number traveling throug

Goshia [24]

Answer:

ΔF=125.22 %

Explanation:

We know that drag force on the car given as

$F_D=\dfrac{1}{2}\rho C_DA v^2$

$C_D$ =Drag coefficient

A=Projected area

v=Velocity

ρ=Density

All other quantity are constant so we can say that drag force and velocity can be given as

$\dfrac{F_D_1}{F_D_2}=\dfrac{v_1^2}{v_2^2}$

Now by putting the values

$\dfrac{F_D_1}{F_D_2}=\dfrac{v_1^2}{v_2^2}$

$\dfrac{F_D_1}{F_D_2}=\dfrac{50^2}{75^2}$

$\dfrac{F_D_1}{F_D_2}=0.444$

Percentage Change in the drag force

$\Delta F=\dfrac{F_D_2-F_D_1}{F_D_1}\times 100$

$\Delta F=\dfrac{F_D_2-0.444F_D_2}{0.444F_D_2}\times 100$

$\Delta F=\dfrac{1-0.444}{0.444}\times 100$

ΔF=125.22 %

Therefore force will increase by 125.22 %.

3 0

3 years ago

The amount of energy necessary to remove an electron from an atom is a quantity called the ionization energy, Ei. This energy ca

larisa86 [58]

Answer:

The value is $E_i = 1.5596 *10^{-18} \ J$

Explanation:

From the question we are told that

The wavelength is $\lambda = 48.2 nm = 48.2 *10^{- 9 }\ m$

The velocity is $v = 2.371*10^6 \ m/s$

The mass of electron is $m_e = 9.109*10^{-31} \ kg$

Generally the energy of the incident light is mathematically represented as

$E = \frac{h * c}{\lambda}$

Here c is the speed of light with value $c = 3.0 *10^{8} \ m/s$

h is the Planck constant with value $h = 6.62607015 * 10^{-34 } J\cdot s$

$E = \frac{6.62607015 * 10^{-34 }* 3.0 *10^{8}}{48.2 *10^{- 9 }}$

=> $E = 4.12 *10^{-18} \ J$

Generally the kinetic energy is mathematically represented as

$E_k = \frac{1}{2} * m_e * v^2$

=> $E_k = \frac{1}{2} * 9.109*10^{-31} * (2.371*10^6 )^2$

=> $E_k = 2.56 *0^{-18} \ J$

Generally the ionization energy is mathematically represented as

$E_i = 4.12 *10^{-18} - 2.56 *0^{-18}$

=> $E_i = 1.5596 *10^{-18} \ J$

8 0

3 years ago

The same fluid flows through four different branching pipes. It enters each pipe from the left with the same speed, v0, and flow

Anvisha [2.4K]

Answer:

The correct option is A.

Explanation:

Following the equation of continuum, AV remains constant.

Case a

(3A)(V0) = AV1 + AV1 + AV1

3AV0 = 3AV1

V1 = V0

Case b

(A)(V0) = (A/3)V2 + (A/3)V2 + (A/3)V2 + (A/3)V2

AV0 = 4V2/3

V2 = 3/4V0

Case c

(A/2)(V0) = AV3 + AV3 + AV3

AV0/2 = 3AV3

V3 = V0/6

Case d

(3A)(V0) = 2AV4 + 2AV4

3AV0 = 4AV4

V4 = 3V0/4

Comparing all the flow speeds, V1 is the largest.

Thus, the correct option is A.

6 0

3 years ago