Question 3 (1 point) The nucleus occupies most of the space of an atom True O False

A rock is thrown upwards and has a max altitude of 40 m. What was its initial velocity?

Natali [406]

Recall the formula,

${v_f}^2-{v_i}^2=2a\Delta x$

where $v_i$ and $v_f$ are the rock's initial and final velocities, respectively; $a$ is its acceleration; and $\Delta x$ is the displacement it undergoes.

At any point during its motion, the rock is subject to gravity, so $a=-g$ , where $g=9.80\frac{\rm m}{\mathrm s^2}$ . At its maximum height, the rock has zero vertical velocity, and if we take its starting height to be the origin, we have $\Delta x=x_{\rm max}$ .

So,

$0^2-{v_i}^2=-2gx_{\rm max}\implies-{v_i}^2=-2\left(9.80\dfrac{\rm m}{\mathrm s^2}\right)(40\,\mathrm m\implies\boxed{v_i=28\dfrac{\rm m}{\rm s}}$

5 0

3 years ago

Help please thank you whoever helps

Delicious77 [7]

Answer:

24a. WX, XW

24b. XY

24c. WV

24d. UV, VU

24e. XY, YX

24f. YX

24g. VW

24h. YZ, ZY

24i. VW, WV

24j. WX

25a. ≈ 20°C

25b. ≈ 290°C

25c. ≈ 20°C

25d. ≈ 290°C

Explanation:

Let's look at the graph and see what phase changes happen as we go from U to Z.

UV: the substance is a solid. As heat is added, temperature increases.

VW: the solid begins to melt. The temperature stays constant as the combination of solid and liquid becomes more and more liquid.

WX: the solid is done melting, and there's only liquid now. As heat is added, temperature increases.

XY: the liquid begins to boil. The temperature stays constant as the combination of liquid and gas becomes more and more gas.

YZ: the liquid is done boiling, and there's only gas now. As heat is added, temperature increases.

If we reverse the direction, YX represents condensation instead of boiling, and WV represents freezing instead of melting.

Kinetic energy of molecules increases with temperature. The greatest increase in temperature is also the greatest increase in kinetic energy.

8 0

3 years ago

Explain the scientific meaning of the word random

Semenov [28]

Explanation:

In general the word random means by chance. The event that occurs unknowingly rather than according to plan is called at its randomness.

But in science, the word random relates with a type of event that is described by its probability distribution.

Also, random means the entropy of the system i.e. it is a thermodynamic quantity that represents the amount of energy in the system that is unavailable for doing work.

8 0

3 years ago

Describe briefly with used of practical knowledge the effect of the voltage stores across and current

DaniilM [7]

Answer:

Answer in explanation

Explanation:

The path of flow of circuit is called electric circuit. In an electric circuit, resistances are connected in two different ways, which are:

1- Series Combination of Resistances

2- Parallel Combination of Resistances

Series combination of resistances

In series combination resistors are connected end to end, and there is only one path for the flow of current.

Characteristics Of Series Circuit:

1. In series circuit there is only one path for the flow of current.

2. Same amount of current flows through each resistor.

I = I₁ = I₂ = I₃ = In

3. Total voltage of the battery is equal to the sum of voltages across each resistor.

V = V₁ +V₂ + V₃ + ... + Vn

4. In series combination the combined resistance of the resistors can be obtained by adding the value of each resistor.

R = R₁ + R₂ + R₃ + … + Rn

Parallel combination of resistances

Resistances are set to be connected in parallel, when each of them is connected directly from the terminals of electric source.

Characteristics Of Series Circuit:

1. There are more than one path for the flow of current.

2. The value of potential difference remains constant on each resistor.

V = V₁ = V₂ = V₃ = Vn

3. Total current is equal to the sum of current passing through each resistor.

I = I₁ + I₂ + I₃ +...+ In

4. Reciprocal of equivalent resistance is equal to the sum of reciprocals of resistances connected in parallel.

1/R = 1/R₁ + 1/R₂ + 1/R₃ + … + 1/Rn

The circuit diagrams are in attachment.

7 0

3 years ago

Where can you find most of earths freshwater

Snezhnost [94]

Answer:

HEY PLS LISTEN THERE IS A GUY GOING AROUND TELLING GIRLS TO JOIN HIS ZOOM ON BRAINLY AND MAKING ACCS AND STUFF TO MAKE PEOPLE JOIN HIS ZOOM.THE CODE IS 387 187 6280 HES A PEDXO AND TELLING GIRLS TO SHOW THERE BODIES TO HIM. SO PLEASE BE AWARE! COPY AND PASTE THIS TO SPREAD THE WORD!

Explanation:

HEY PLS LISTEN THERE IS A GUY GOING AROUND TELLING GIRLS TO JOIN HIS ZOOM ON BRAINLY AND MAKING ACCS AND STUFF TO MAKE PEOPLE JOIN HIS ZOOM.THE CODE IS 387 187 6280 HES A PEDXO AND TELLING GIRLS TO SHOW THERE BODIES TO HIM. SO PLEASE BE AWARE! COPY AND PASTE THIS TO SPREAD THE WORD!

3 0

3 years ago