A skydiver has a mass of 110 kg. At what speed will she have a momentum
of 1000 kg•m/s?
O A. 2.1 m/s
B. 9.1 m/s
C. 28.6 m/s
D. 14.3 m/s

Answer:

47 m

Explanation:

Data obtained from the question include the following:

Length of dry leg 1 (L1) = 40 m

Length of dry leg 2 (L2) = 25 m

Length of swimming course (L) =..?

The length of the swimming course can be obtained by using pythagoras theory as shown below:

L² = L1² + L2²

L² = 40² + 25²

L² = 1600 + 625

L² = 2225

Take the square root of both side.

L = √2225

L = 47.1 ≈ 47 m

Therefore, the length of the swimming course is approximately 47 m.

Answer:

va = 4.79 m/s

vb = 1.29 m/s

Explanation:

Momentum is conserved:

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(3.00) (0) + (6.50) (3.50) = (3.00) v₁ + (6.50) v₂

22.75 = 3v₁ + 6.5v₂

For an elastic collision, kinetic energy is conserved.

½ m₁u₁² + ½ m₂u₂² = ½ m₁v₁² + ½ m₂v₂²

m₁u₁² + m₂u₂² = m₁v₁² + m₂v₂²

(3.00) (0)² + (6.50) (3.50)² = (3.00) v₁² + (6.50) v₂²

79.625 = 3v₁² + 6.5v₂²

Two equations, two variables.  Solve with substitution:

22.75 = 3v₁ + 6.5v₂

22.75 − 3v₁ = 6.5v₂

v₂ = (22.75 − 3v₁) / 6.5

79.625 = 3v₁² + 6.5v₂²

79.625 = 3v₁² + 6.5 ((22.75 − 3v₁) / 6.5)²

79.625 = 3v₁² + (22.75 − 3v₁)² / 6.5

517.5625 = 19.5v₁² + (22.75 − 3v₁)²

517.5625 = 19.5v₁² + 517.5625 − 136.5v₁ + 9v₁²

0 = 28.5v₁² − 136.5v₁

0 = v₁ (28.5v₁ − 136.5)

v₁ = 0 or 4.79

We know v₁ isn't 0, so v₁ = 4.79 m/s.

Solving for v₂:

v₂ = (22.75 − 3v₁) / 6.5

v₂ = 1.29 m/s

Answer:

a ) 19,536.72 J,

b ) ( About ) 84°C

Explanation:

a ) We can solve this problem assuming that the dishwater remains a constant 78°C the entire duration.

Q = mass of the glass [tex]*[/tex] specific heat of the glass

The mass of the glass is given by 401 g, the specific heat by 840 J / kg [tex]*[/tex] C. Respectively the change in temperature would be the difference between the temperature of the dishwater, and that of the glass. As we want the units in Joules, we need to first convert the 401 g ⇒ kilograms.

401 g = 401 / 1000 kg = 0.401 kg,

Q = 0.401 kg [tex]*[/tex] 840 J / kg 19,536.72 J

b ) We know that the specific heat capacity of water is 4.184 J / g [tex]*[/tex] C. As the final temperature will be common between each substance, we can make their respective heat absorbed, the same. Note that the heat capacity is given in J / g

0.023 kg = 0.023 [tex]*[/tex] 1000 = 23 g,

0.18 kg = 180 g

[tex]- ( 180 )( 4.184 )( x - 93 ) = 23( 4.184 )( x - 14 )[/tex],

[tex]-753.12x+70040.16=96.232x-1347.248[/tex],

[tex]-753.12x=96.232x-71387.408[/tex],

[tex]-849.352x=-71387.408[/tex],

[tex]\frac{-849.352x}{-849.352}=\frac{-71387.408}{-849.352}[/tex],

[tex]x=84.04926\dots[/tex]

The final temperature will be about 84°C

Answer:

1800 N

Solution:

Impulse = mΔv = m * (u - v) .

 here m = 100 kg

          u = 4 m/s

          v = -5 m/s

  impulse = 100 x ( 4 - ( -5 ) ) = 900 Kg m/s .

Average reaction Force ( Favg ) = impulse / Δt

Average reaction Force ( Favg )  = 900kg·m/s / 0.5s

Average reaction Force ( Favg )  = 1800 N

A temperature of 20 degree Celsius is equal to 68 degree Fahrenheit temperature. Therefore, option b is correct.

Temperature is a physical unit which measures the overall heat of an object. The SI unit of temperature is Kelvin (K) and the commonly used unit is degree Celsius (°C).

Other unit of temperature is Fahrenheit  (°F). These units can be interconverted between each other with the specific relation between them.

We know that zero degree Celsius is 32  Fahrenheit . Let T be the temperature in degree Celsius,

then, (T° × 9/5) + 32 = T in °F.

Given, temperature = 20 °C.

This temperature can be converted to °F as follows:

(20 °C × 9/5) + 32 = 68 °F.

Therefore, 20 °C is equal to a temperature of 68 °F.

Find more on Fahrenheit temperature:

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Answer: the best times to see it would be from 10 pm to 1 am, meaning when the night skies are dark and clear. The best months to see it would be from April to late August. Whereas the best places in the world to view them would be closer to the arctic circle, this includes Canada, Alaska, Iceland and Greenland.

Explanation:

Hope this helps

Auroras are created by disruptions in the magnetosphere induced by the solar wind. The greatest times to see it are between 10 p.m. and 1 a.m.

Auroras are created by disruptions in the magnetosphere induced by the solar wind. The paths of charged particles in the magnetospheric plasma are altered as a result of these disruptions.

These particles, primarily electrons, and protons fall to the upper atmosphere.

The greatest times to see it are between 10 p.m. and 1 a.m. when the night skies are dark and clear. It is recommended to visit between April and late August.

The greatest spots to see them are closer to the arctic circle, which encompasses Canada, Alaska, Iceland, and Greenland.

Hence the greatest times to see it are between 10 p.m. and 1 a.m.

To learn more about the aurora borealis refer to the link;

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Answer:

U = 5/2 NkT.

Explanation:

A diatomic molecule = H₂, O₂, N₂ .....etc

A diatomic molecule has 5 degrees of freedom.

So,  the internal energy for diatomic gases is :

U = 5/2 NkT.

Answer:

A. lord kelvin

Explanation:

In 1848, Kelvin used this as a basis for an absolute temperature scale. He defined "absolute" as the temperature at which molecules would stop moving, or "infinite cold." From absolute zero, he used the same unit as Celsius to determine the increments.

Absolute zero cannot technically be achieved. However, scientists have been able to lower the temperature of matter to just a fraction of a Kelvin above absolute zero through techniques such slowing down particles using lasers.

Answer:

2. The temperature doubles.

014) 48.6 J

015) 13,700 J

016) 5.94×10⁻²¹ J

Explanation:

PV = nRT

P and n are constant.

nR/P = k

V/T = k

If the volume doubles, the temperature also doubles.

014) The kinetic energy per atom is:

KE = 3/2 kT

KE = 3/2 (1.38×10⁻²³ J/K) (21 + 273) K

KE = 6.09×10⁻²¹ J

The total kinetic energy is:

KE = (6.09×10⁻²¹ J) (7.99×10²¹)

KE = 48.6 J

016) The kinetic energy per atom is:

KE = 3/2 kT

KE = 3/2 (1.38×10⁻²³ J/K) (14 + 273) K

KE = 5.94×10⁻²¹ J

015) The total kinetic energy is:

KE = (5.94×10⁻²¹ J) (3.82 mol) (6.02×10²³ atom/mol)

KE = 13,700 J

Answer:

A

Explanation:

A dynamic equilibrium is a chemical equilibrium between a forward reaction and the reverse reaction where the rate of the reactions are equal.

The rate of the forward reaction equals the rate of the backward reaction.

For a system to be in dynamic equilibrium, the forces should be balanced.

According to chemistry, Dynamic equilibrium is all about the equal rate of change in reactants and products, i.e., there will be a steady state. Also in Physics, if though the number of the composition of mixtures happens and that does not change with time, i.e., it is equilibrium constant. For example, when the car moving on the road, there will be some friction. The forward force of the car happened due to friction but no other force has changed at car's constant speed. When the net force will be same then it is known to be dynamic equilibrium.

Equilibrium constants can be determined as rate constants through reversible reaction, i.e., the rate of the forward reaction equals to the rate of the backward reaction.

Thus, option A is correct.

Learn more about dynamic equilibrium

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Answer:

electric potential energy=

[tex]\frac{KQq}{r} [/tex]

so the electric potential energy and distance(r) are inversely proportional.

then, the greatest energy occur in the smallest distance b/n the two balloon.

Answer:

Top Left

Explanation:

The two balloons would create enough friction and energy to separate from each other as two balls of air would push each other from their energy

Answer:

14 mL

Explanation:

Ideal gas law:

PV = nRT

If n is constant, then:

PV / T = PV / T

(0.819 atm) (17.9 mL) / (273 + 28) K = (0.99 atm) V / (273 + 13) K

V = 14 mL

Answer:

33.3 g ≈ 33 g

Explanation:

Please see attached photo for explanation.

From the attached photo, M is the mass that we must obtain to balance the plank.

The mass, M can be obtained as follow:

Anticlockwise moment = clockwise moment

Anticlockwise moment = 50 x 20

Clockwise moment = M x 30

Anticlockwise moment = clockwise moment

50 x 20 = M x 30

Divide both side by 30

M = (50 x 20)/30

M = 33.3 g ≈ 33 g

Therefore, the mass that will balanced the plank at the 70 cm length is appropriately 33 g

Answer:

diagram?

Explanation:

Answer:

-150

Explanation:

I just did it on EDGE2020, and it's 100% correct! Please heart and rate if you found this answer helpful.

Answer:

30kg-m/s

Explanation:

momentum = mass x velocity

First of all, what is a cell?

A cell is a power source. It converts chemical energy into electrical energy which then allows a current to flow.

Then, what is a voltage?

A voltage is an electrical force required to push an electric current.

The answer to your question

The powers source requires a voltage of 1.5 to push the electrical current around the circuit

Answer:

[tex]\boxed{299}[/tex]

Explanation:

In this reaction, Sum of Atomic Masses of Left side = Sum of Atomic Masses of right side

Let the atomic mass of Thorium be x

So,

233 = 4 + x

Subtracting 4 to both sides

x = 233-4

x = 229

Answer:

Explanation:

B the oxygen atom becomes strongly positive

and

C HE HYDROGEN ATOM BECOMES PARTIALLY POSITIVE

PLS MARK MY ANSWER AS THE BRANLIEST

Answer:

4.58×10²³ atoms

5.94×10⁻²¹ J

1340 m/s

Explanation:

Use ideal gas law to find moles of gas.

PV = nRT

(1.266 atm × 101300 Pa/atm) (4/3 π (0.15 m)³) = n (8.31451 J/mol/K) (14 + 273) K

n = 0.760 mol

Use Avogadro's number to find number of atoms.

(0.760 mol) (6.02214×10²³ atom/mol) = 4.58×10²³ atoms

Average kinetic energy per molecule is:

KE = 3/2 kT

KE = 3/2 (1.38066×10⁻²³ J/K) (14 + 273) K

KE = 5.94×10⁻²¹ J

RMS speed of each atom is:

KE = 1/2 mv²

5.94×10⁻²¹ J/atom = 1/2 (0.004 kg/mol) (1 mol / 6.02214×10²³ atom) v²

v = 1340 m/s

Explanation:

They are;

hope it helps...

Answer:

Option B

Explanation:

Weight can be measured in pounds. Pounds is a unit of weight.

=> Mass is measured in kgs

=> A bowling ball has more mass than a golf ball.

=> Objects do not have the same weight regardless of where they are. The weight depends on where they are as it depends on the acceleration due to gravity (g)

Answer:

B

Explanation:

Answer:

  q₁ = -6.54 10⁻⁵ C

Explanation:

Force is a vector quantity, but since all charges are on the x-axis, we can work in one dimension, let's apply Newton's second law

                F = F₁₂ + F₂₃

the electric force is given by Coulomb's law

                F = k q₁q₂ / r₁₂²

let's write the expression for each force

                F₂₃ = k q₂ q₃ / r₂₃²

                F₂₃ = 9 10⁹ 34.4 10⁻⁶ 72.8 10⁻⁶ / 0.1²

                F₂₃ = 2.25 10³ N

                F₁₂ = k q₁q₂ / r₁₂²

                F₁₂ = 9 10⁹ q₁ 34.4 10⁻⁶ / 0.1²

                F₁₂ = q₁   3,096 10⁷ N

we substitute in the first equation

                225 = q₁  3,096 10⁷ +2.25 10³

                q₁ = (225 - 2.25 10³) / 3,096 10⁷

                q₁ = -6.54 10⁻⁵ C

Answer:

The direction is that of a 3rd quadrant angle

Explanation:

when you have 2 45 angles it equals to 90 then with the 90 we multiply by 2 due to the 2 adjacent angles equating to 180 which swings it to the 3rd quadrant angle

Explanation:

Take south to be negative.

a. Momentum is mass times velocity.

p = mv

p = (540 kg) (-6 m/s)

p = -3240 kg m/s

p = 3240 kg m/s south

b. Impulse = change in momentum

J = Δp

Since the mass is constant:

J = mΔv

J = (540 kg) (-4 m/s − (-6 m/s))

J = 1080 kg m/s

J = 1080 kg m/s north

Answer:

They are winds that blow in the opposite direction of a normal wind

Explanation:

Answer:

B.) They are winds that blow in the opposite direction of a normal wind.

Explanation:

it's correct trust

Answer:

resultant is a single force that can replace the of a number of forces , equililbrant is a force that is exactly opposite to resultant

Explanation:

Explanation:

the colour change of PH indicator is caused by the dissociation of the H+ ion from the indicator itself recall the pH indicator are not only natural dyes but also a weak acid the dissociation of weak and Indicator causes a solution to change color

Answer:

D The density of methanol must be less than the density of water.

Explanation:

Ice sinks in methanol, so the density of ice is greater than the density of methanol.

Ice floats in water, so the density of ice is less than the density of water.

Since the density of ice is the same in each case, the density of methanol must be less than the density of water.

ρ_methanol < ρ_ice < ρ_water

for the question w the coffee cup and the dishwasher: 19,536.72 J

for the question w the 3 pots of boiling water: They all have the same temperature

for the question w the copper: 103.84 Celsius

(Not sure what the other 2 pictures are about but good luck)