a ball weighs 0.25 kg and is moving at 15 m/s. what is the momentum of the ball?

Answer:

a) 19.6 m/s, 19.6 m

b) 58.8 m/s, 176.4 m

Explanation:

Take down to be positive.  Given:

v₀ = 0 m/s

a = 9.8 m/s²

a) Find v and Δy when t = 2.0 s.

v = at + v₀

v = (9.8 m/s²) (2.0 s) + 0 m/s

v = 19.6 m/s

Δy = v₀ t + ½ at²

Δy = (0 m/s) (2.0 s) + ½ (9.8 m/s²) (2.0 s)²

Δy = 19.6 m

b) Find v and Δy when t = 6.0 s.

v = at + v₀

v = (9.8 m/s²) (6.0 s) + 0 m/s

v = 58.8 m/s

Δy = v₀ t + ½ at²

Δy = (0 m/s) (6.0 s) + ½ (9.8 m/s²) (6.0 s)²

Δy = 176.4 m

Answer:

latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure. The energy required to melt a solid to a liquid is called the heat of fusion, and the heat of sublimation is the energy

Explanation:

Mechanical energy = Kinetic Energy + Potential Energy

Kinetic energy = 1/2 * m * v² = 1/2 * 3.5 * (10)²

=> Kinetic energy = 175 J

Potential energy = m * g * h = 3.5 * 10 * 3 = 105 J

Hence,

Mechanical energy = Kinetic Energy + Potential Energy

= 175 J + 105 J

= 280 J

Taking into account the potencial, kinetic and mechanical energy, the total mechanical energy is 278.005 J.

Potential energy refers to the position that a mass occupies in space and its magnitude is directly proportional to the height at which the object is, with respect to a reference position, to the mass of the object and to gravity:

Ep = m×g×h

On the other hand, kinetic energy manifests itself when bodies move and is associated with speed. The kinetic energy of a body depends on its mass and the square of its speed:

Ec = [tex]\frac{1}{2}[/tex]×m×v²

The mechanical energy of a body is the capacity it has to carry out mechanical work, that is, to produce a movement due to causes of mechanical origin, such as its position or its speed.

The mechanical energy of a body is the sum of its kinetic energy and its potential energy:

Em = Ep + Ec

Where

Then:

Em= m×g×h + [tex]\frac{1}{2}[/tex]×m×v²

The Principle of conservation of mechanical energy indicates that, in the absence of friction and without the intervention of any external work, the sum of the kinetic and potential energies remains constant, that is, the mechanical energy of a body remains constant throughout the movement. if no friction force acts.

In this case, you know that:

Complying with the Principle of Conservation of Mechanical Energy and replacing in the expression of mechanical energy:

Em= 3.5 kg×9.81 [tex]\frac{m}{s^{2} }[/tex]×3 m + [tex]\frac{1}{2}[/tex]×3.5 kg×(10 [tex]\frac{m}{s}[/tex])²

Solving:

Em=103.005 J + 175 J

Em= 278.005 J

Finally, the total mechanical energy is 278.005 J.

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Yellow has the lowest density. I took the test and got this question correct. :)

The object represented by the yellow graph has the lowest density.

It is defined as the mass per unit volume of the body. Mathematically -

ρ = M/V

Given is a graph showing the variation of the mass with volume.

All of the given graphs are straight lines. The slope of the line determines the proportionality constant or density of the four objects whose graphs are plotted. The graph with the maximum slope will have the highest density and with the minimum slope has lowest density. It can be seen that the yellow graph has the smallest slope (slope is the angle any straight line makes with x - axis). So it will have the lowest density.

Therefore, the object represented by the yellow graph has the lowest density.

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Explanation:

Answer:

S. offspring recieve a mix of genes from two different parents

Offspring acquire genes that are exactly the same as one parent’s genes. Option B is correct.

Given that,
To choose the statement best explains the genetic variation that results from sexual reproduction.

Sexual reproduction is the process of creating new organisms by combining the genetic details of two individuals of different genders. The genetic details in most animals is carried on chromosomes in the nucleus of reproductive cells called gametes, which unite to form a diploid zygote.

Here,
The solution is due to the fact that each parent has two distinct sets of genes. Furthermore, each parent only passes on half of their DNA to their offspring. And that the half that is passed on is arbitrary. All of this ensures that each child is born with a distinct set of genes.

Thus, Offspring acquire genes that are exactly the same as one parent’s genes. Option B is correct.

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Three students measured the length of a stamp whose accepted length is 2.71 cm, on the basis of the table student 2 is both precise and accurate, therefore the correct answer is option B.

A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.

The degree to which a measurement is accurate in relation to its true value. The degree to which the same results are produced by repeated measurements under the same circumstances is known as precision.

Thus, according to the chart, student 2 is both exact and accurate, hence the proper response is option B. Three students measured the length of a stamp, and the approved length is 2.71 cm.

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v = ir

where v is voltage and i is current

r = v/i

r = 4/0.5

r = 8 ohms

The current through a wire is 0.5 a when the potential difference across is 4.0.v, the resistance of the wire is 8.0 ohms.

Ohm's law, which states that the resistance (R) of a wire is equal to the ratio of the potential difference (V) across the wire to the current (I) flowing through it, can be used to calculate the resistance of a wire.

It has the following mathematical expression:

R = V ÷ I

Here, it is given that:

Potential difference (V) = 4.0 V

Current (I) = 0.5 A

Now we can substitute the values into the formula:

R = 4.0 V ÷ 0.5 A

Calculating the division:

R = 8.0 ohms

Therefore, the resistance of the wire is 8.0 ohms.

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Use the formula for momentum:  Momentum = (mass) x (speed)

2.67 x 10⁴ kg-m/s  =  (mass) x (8.9 m/s)

Mass  =  (2.67 x 10⁴ kg-m/s) / (8.9 m/s)

Mass  =  3,000 kilograms

That's 3 metric tons.  On Earth, it weighs 6,614 pounds, or 3.3 US tons.

It probably performs a lot like my car.

Answer:

motion: motion is the phenomenon in which an object changes its position over time. four common types of motion are rotary, oscillating, linear, and reciprocating.

rest is the polar opposite

Explanation:

Answer:

In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

Explanation:

Sorry if it's wrong!!!!!!

Answer:

VVV

Explanation:

A solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

Explanation:

total distance travelled = 400m

total time taken = 4min 45sec = 4*60 + 45 = 285sec

Avg speed = 400/285

                   = 2.162162....m/s

                   = 2.162....m/s

Hope it helped u,

dont forget to put thanks,

and pls mark this as the brainliest

Answer:

The distance separating the two particles when the moving particle is momentarily stopped is 0.947 m

Explanation:

Given that,

First charge = 40 μC

Second charge = 80 μC

Distance between the two particles = 2.0 m

Kinetic energy = 16 J

We need to calculate the distance separating the two particles when the moving particle is momentarily stopped

Using conservation of energy

[tex]K.E+\dfrac{kq_{1}q_{2}}{d}=\dfrac{kq_{1}q_{2}}{x}+K.E[/tex]

Put the value into the formula

[tex]16+\dfrac{9\times10^{9}\times40\times10^{-6}\times80\times10^{-6}}{2}=\dfrac{9\times10^{9}\times40\times10^{-6}\times80\times10^{-6}}{x}+0[/tex]

[tex]16+14.4=\dfrac{28.8}{x}[/tex]

[tex]30.4x=28.8[/tex]

[tex]x=\dfrac{28.8}{30.4}[/tex]

[tex]x=0.947\ m[/tex]

Hence, The distance separating the two particles when the moving particle is momentarily stopped is 0.947 m

The distance separating the two particles when the moving particle is momentarily stopped is 0.947 m.

The given parameters;

The kinetic energy is zero at the instant the moving particle is momentarily stopped.

The distance separating the two particles when the moving particle is momentarily stopped is calculated as follows;

[tex]K.E_1 \ + W_1 = K.E_2 + W_2\\\\K.E_1 + \frac{kq_1q_2}{x_1} = K.E_2 + \frac{kq_1q_2}{x_2} \\\\16 \ + \ \frac{(9\times 10^9)\times (40\times 10^{-6})\times (80\times 10^{-6})}{2} = 0 \ + \ \frac{(9\times 10^9)\times (40\times 10^{-6})\times (80\times 10^{-6})}{x_2} \\\\30.4= \frac{28.8}{x_2} \\\\x_2 = \frac{28.8}{30.4} \\\\x_2 = 0.947 \ m[/tex]

Thus, the distance separating the two particles when the moving particle is momentarily stopped is 0.947 m.

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Answer:

oxygen

Explanation:

ok buddy

Answer:

D. Place mirrors at both A and E

Explanation:

Answer:

mecanichal energy

Explanation:

................

Answer:

$50

Explanation:

:) =)

Answer:

The doctors could see if her cells are getting the molecules they need from food and air

Explanation:

The doctors could see if her cells are getting the molecules they need from food and air. Doing so allows the doctors a general overview of how well her body's biological systems are performing since the basic necessities of the human system are food and oxygen. Therefore if the body is receiving both food and oxygen properly and distributing it properly and efficiently as well without any problems then the most likely outcome is that she is healthy enough to perform her tasks in the submarine under more pressure.

Answer:

The doctors could see if her cells are getting the molecules they need from food and air

Explanation:

Answer:

The launch speed is approximately 13.28 m/s

Explanation:

The given parameters are;

The distance from the base of the cliff the projectile lands = 26.3 meters

The height of the cliff, s = 19.3 meters

The time it takes the projectile to land = 5 seconds

The direction of the projectile = Horizontal

The vertical motion of the projectile is given as follows;

19.3 = 1/2 × g × t² = 1/2 × 9.81 × t²

t = √(2 × 19.3/9.81) ≈ 1.98 seconds

Therefore, the time it takes to land ≈ 1.98 seconds

The launch (horizontal) speed = (The horizontal distance)/(Horizontal time)

The launch (horizontal) speed = 26.3/1.98 ≈ 13.28 m/s.

The launch speed of a horizontally launched projectile is equal to 13.22 m/s.

Given the following data:

To determine the launch speed of a horizontally launched projectile:

First of all, we would calculate the time it took the projectile to land at the base of the cliff by using the maximum height formula:

[tex]H = \frac{1}{2} gt^2[/tex]

Making t the subject of formula, we have:

[tex]t=\sqrt{\frac{2H}{g} }[/tex]

Substituting the given parameters into the formula, we have;

[tex]t=\sqrt{\frac{2\times 19.3}{9.8} }\\\\t=\sqrt{\frac{38.6}{9.8} }\\\\t=\sqrt{3.94}[/tex]

Time, t = 1.99 seconds

Next, we would determine the launch speed by using the formula:

[tex]Horizontal\;speed = \frac{horizontal\;distance}{time} \\\\Horizontal\;speed = \frac{26.3}{1.99}[/tex]

Horizontal speed = 13.22 m/s

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Answer:

B. Insulates thermal energy

Answer:

b

Explanation:

if you insulate thermal energy aka heat you are keep the heat in one place in this case the metal, which provent you from burning your self if you hold the plastic part.

filling it up

Explanation:

Answer:

a = 5

Explanation:

F = M × A

15 = 3 × a

a = 15 / 3

a = 5

This is only if the toy can is pushing the book or smth coz the question looks incomplete...?

Answer:

5 m/s^2

Explanation:

Realize that Newton's Second Law explains that the net force is equal to the mass mulitplied by the acceleration, or in simple terms, F=ma. In the problem, the force is 15 newtons, and the mass is 3 kg. Substiting and dividing, we get 5 m/s^2 (5 meters per second squared).

Answer:

what is the number

Explanation:

Answer:

Yes

Explanation:

An atom is made up of itself. Yes this is crazy but true. So far we have found the universe is everlasting, and the universe is part of itself meaning there nothing outside, except heaven and hell

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 0.17 g/cm³

1 mL = 1 cm³

12 mL = 12 cm³

So we have

mass = 0.17 × 12

We have the final answer as

Hope this helps you

Answer:

235.2 m

Explanation:

Given:

v₀ = 0 m/s

v = 24 m/s

t = 19.6 s

Find: Δx

Δx = ½ (v + v₀) t

Δx = ½ (24 m/s + 0 m/s) (19.6 s)

Δx = 235.2 m

Initial speed = zero

Final speed = 24 m/s

Time interval = 19.6 s

We have to find distance traveled by during the given interval of time[tex].[/tex]

★ Acceleration of car :

➠ a = (v - u)/∆t

➠ a = (24 - 0)/19.6

➠ a = 1.22 m/s²

★ Distance traveled by car :

➤ v² - u² = 2as

➤ 24² - 0² = 2(1.22)s

➤ 576 = 2.44s

➤ s = 576/2.44

➤ s = 236 m

Explanation:

Momentum is mass times velocity.

p = mv

720 kg m/s = m (5 m/s)

m = 144 kg