pysics question can anyone answer me this question ​

Answer: 63.753 mph

Explanation:

[tex]28.5 \frac{m}{s} * \frac{1 mile}{1609.34 m} * \frac{3600s}{1 hour} = 63.753 \frac{miles}{hour}[/tex]

Answer:

W = 10000J

Explanation:

W = F • s

W = Work in J

F = Force in N

s = displacement in m

W = 5000N • 2m

W = 10000J

Answer:

velocity arrow

Explanation:

When velocity decreases, acceleration and velocity are in opposite directions, so the acceleration arrow and velocity arrow point in the opposite directions.

Answer:

The skier is in a conservative system, as the only force acting upon him is gravity. Instead of calculating the work done over the curved hills, we can construct an alternate path, because of the principle of path independence:

Explanation:

Answer:

It's C. The magnetic force is a

Explanation:

took the test

A truck weighing 5 x 10³ kg force.

A cart weighing 500 kg force.

Moving with the same speed complete their

kinetic energies.

As we know that,

Formula of:

→ Kinetic energy = 1/2 x m x v².

Using this formula in the equation, we get.

(1).

→ For truck = 1/2 x 5 x 10³ x v².-----

→ For cart = 1/2 x 500 x v². -----(2).

Divide equation (1) and (2), we get.

⇒ KE₁/KE₂ = 5 x 10³/5 x 10².

➡ KE₁/KE₂ = 10/1.

⇒ KE₁/KE₂ = 10:1.

Answer:

1/4

Explanation:

Total radiation energy depends on temperature, so [tex]E_A=E_B[/tex]

Radius [tex]R_A=2R_B[/tex]

so the surface area [tex]S_A=4 S_B[/tex]

energy per unit area

[tex]\frac{E_A}{S_A}=\frac{1}{4}\frac{E_B}{S_B}[/tex]

Answer:

hope it helps

Explanation:

1. flowing water

2.wind

3. hydroelectric power station

4. dam

5. lake

6. gravitational

7. renewable

8. fuel

9. pollution

10. expensive

11. flood

Answer:

a.) 75 N

Explanation:

Force = mass × acceleration

Here,

Mass (m) = 25 kg

Acceleration (a) = 3 m/s²

Force (F) = ?

Using the formula,

F = ma

F = 25 × 3

F = 75 N

Hope it helps ⚜

Answer:

The strategy we would like you to learn has five major steps: Focus the Problem, Physics Description, Plan a Solution, Execute the Plan, and Evaluate the Solution. Let's take a detailed look at each of these steps and then do an sample problem following the strategy.

Answer:

False

Explanation:

Unless it encounters external factors, the ship will continue to move at a fixed pace even if the engine is turned off.

Air blows from one place to another because gases move from high-pressure areas to low-pressure areas

In simple words

it happens because of pressure differences.

Answer:

Gases moving from high-pressure places to low-pressure places. The bigger the difference of pressure the faster the air moves from both. Giving the movement of air we experience.

OR:

The high-pressure air will raise up to the low-pressure air and will come down causing the air will blow from one place to another.

The second wire is stretched by 15.4 cm long provided the two-wire are made of the same materials and equal forces.

Young's Modulus of Elasticity explains the elastic characteristics of a solid experiencing tension or compression in a unilateral direction

Here,  the material used is a wire which returns to its length after being stretched or compressed.

From the parameters given:

If the second wire is as twice as first, then:

where;

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We will increase the amplitude of the wave by a factor of 4 If we want to double this rate

Transverse wave, travels in a way in which points on a wave oscillate along paths at right angles of 90 degrees to the direction of the wave.

We see that energy transported along a wave path is directly proportional to the square of the amplitude.

E =kA^2

Therefore, we will increase the amplitude of the wave by a factor of 4 If we want to double this rate.

Option B

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Answer

Sun and Moon's gravity

The number of valance electrons in the given Bohr Diagram is 7 electrons each.

Bohr diagrams depict electrons orbiting the nucleus of an atom in the same way that planets orbit the sun.

Electrons in the Bohr model are depicted as traveling in circles at different shells depending on the element.

We now know that the Bohr Model has some flaws, but it is still widely used because of its straightforward approach to atomic theory.

The Bohr model was also the first to incorporate quantum theory into an atomic model, making it the forerunner of today's more accurate quantum-mechanical models.

Each valance electron in the given Bohr Diagram has 7 electrons.

Thus, the valance electrons in each of the given diagram is 7 electrons as they have these electrons in their outermost shell.

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#SPJ2

Answer:

i think the answer is (a) since c is not responsible for the electricity

Answer:

10 minutes

Explanation:

Given:

Given:Speed of bus excluding stoppages =54 km/h

Speed of bus including stoppages = 45 km/h

To calculate: Minutes/per hour the bus stopped = ?

Distance covered by bus without stopping =54 km/h

Distance covered by bus with stopping =45 km/h

Due to stoppages it could

9km (54-45km) less

Time taken to cover 9 km=?

time \: taken \: = \frac{distane}{speed }timetaken=

speed

distane

Distance=9km

Speed = 54km/h.

Substituting given values on the above formula we get,

time \: taken \: = \frac{9}{54} hour = \frac{1}{6} hour \:timetaken=

54

9

hour=

6

1

hour

=10 minutes

Hence,the correct answer is 10 minutes.

The power of the fan is 70 Watt.

Power can be defined as the rate at which energy is used. The S.I unit of power is Watt (W)

The power of the fan can be calculated using the formula below.

From the question,

Substitute these values into equation 1

Hence, The power of the fan is 70 Watt.

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We have that the magnitude of the gravitational force  is mathematically given as

f=6.377N

Question Parameters:

Earth exerts a 100 N gravitational force on a metal box.

(Mass of the earth is 6e24 kg and radius of the earth is 6.4e6m.)

Generally the equation for the Gravitational mForce  is mathematically given as

[tex]F=\frac{GMm}{r^2}\\\\Therefore\\\\F=\frac{100/9.8* 6e116e24}{6.4e6^2}[/tex]

f=6.377N

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Answer:

I actually don't know bc I only need point s so yeah

Explanation:

the explanaition is nothing bc I have nothing

You need the distance travelled and how long it took so the time. You can use this in the formula Speed = distance / time to calculate the speed or velocity.

C) end Q attracts both X and Y

Reason: The metal bar PQ is magnetized and has magnetic properties in it, that's I why the point Q is pointing towards the north. The XY bar doesnt point towards any specific direction because it isn't magnetized and doesn't have magnetic properties in it, and that's why it gets attracted by Q and it's both ends.

The work is simply W = V Q where V is the voltage of the battery and Q the charge on the electron

W = V joules/coulomb * E coulombs = joules

The focal length of the lens is 2m and the position of the image is 6 m.

The size of the image formed depends on the position of the object from the lens.

[tex]M = \frac{v}{u}[/tex]

where;

The image distance is calculated as follows;

[tex]2 = \frac{v}{3} \\\\v = 2(3) \\\\v = 6 \ m[/tex]

The focal length of the lens is calculated as follows;

[tex]\frac{1}{f} = \frac{1}{v} + \frac{1}{u}\\\\\frac{1}{f} = \frac{1}{6} + \frac{1}{3} \\\\\frac{1}{f} = \frac{3}{6} \\\\f = 2m[/tex]

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Before the collision, the total momentum of the two train cars is

(13.0 kg) (3.40 m/s) + 0 = 44.2 kg•m/s

After the collision, the two cars have velocity v₁ and v₂ so that their total momentum is

(13.0 kg) v₁ + (38.0 kg) v₂

Momentum is conserved, so

(13.0 kg) v₁ + (38.0 kg) v₂ = 44.2 kg•m/s

Before collision, the total kinetic energy of the two cars is

1/2 (13.0 kg) (3.40 m/s)² + 0 = 75.14 J

and after collision,

1/2 (13.0 kg) v₁² + 1/2 (38.0 kg) v₂²

Energy is also conserved, so

1/2 (13.0 kg) v₁² + 1/2 (38.0 kg) v₂² = 75.14 J

or

(13.0 kg) v₁² + (38.0 kg) v₂² = 150.28 J

Solve the momentum equation for either v₁ or v₂ :

(13.0 kg) v₁ + (38.0 kg) v₂ = 44.2 kg•m/s

⇒   v₂ = (44.2 kg•m/s - (13.0 kg) v₁) / (38.0 kg)

Substitute this into the energy equation and solve for the other variable :

(13.0 kg) v₁² + (38.0 kg) [(44.2 kg•m/s - (13.0 kg) v₁) / (38.0 kg)]² = 150.28 J

⇒   (17.4 kg) v₁² - (30.2 kg•m/s) v₁ + 51.4 J ≈ 150.28 J

⇒   (17.4 kg) v₁² - (30.2 kg•m/s) v₁ - 98.9 J ≈ 0

Using the quadratic formula,

⇒   v₁ = 3.40 m/s   or   v₁ ≈ -1.67 m/s

(We ignore the second solution because that's the initial condition.)

Solve for the remaining velocity:

v₂ = (44.2 kg•m/s - (13.0 kg) (-1.67 m/s)) / (38.0 kg)

⇒   v₂ ≈ 1.73 m/s

A car starts from rest and accelerates at 9 m/s². After 240 m. the final speed is 66 m/s.

Uniformly Accelerated Motion is the motion of an object where the acceleration is constant.

A car starts from rest, that is, its initial speed is 0 m/s. It accelerates at 9 m/s². We can find the final speed after 240 m using the following kinematic equation.

v² = u² + 2 × a × s

v² = (0 m/s)² + 2 × (9 m/s²) × 240 m

v = 66 m/s

where,

A car starts from rest and accelerates at 9 m/s². After 240 m. the final speed is 66 m/s.

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The speed with which the first block leaves the edge of the table is 2.84 m/s.

Since both blocks are connected, they will travel at the same speed from the given position. The potential energy of the blocks at the given position will be converted to kinetic energy.

P.E = K.E

mgh = ¹/₂mv²

gh = ¹/₂v²

[tex]v = \sqrt{2gh}[/tex]

The speed of the blocks from the given position is calculated as follows;

[tex]v = \sqrt{2 \times 9.8 \times 0.41} \\\\v = 2.84 \ m/s[/tex]

Thus, the speed with which the first block leaves the edge of the table is 2.84 m/s.

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Apply ohms law

[tex]\\ \tt\hookrightarrow \dfrac{V}{I}=R[/tex]

[tex]\\ \tt\hookrightarrow R=\dfrac{125.6}{7.9}[/tex]

[tex]\\ \tt\hookrightarrow R=15.8\Omega[/tex]

While cooking dinner, Dinah's oven uses a 125.6 V line and draws 7.9 A of current when heated to its maximum temperature. What is the resistance of the oven when it's fully heated?

[tex] \frac{v}{i} = r[/tex]

[tex]r = \frac{125.6}{7.9} [/tex]

[tex]r = 15.8[/tex]