5. (3 points) Recall that the Stefan-Boltzmann Law relates the temperature of a blackbody
(T) and the power radiated at its surface (E), according to:
B = GT4
(Note that we have assumed the emissivity is 1, and therefore leave it out of this equation for simplicity).

If a star's surface temperature is 30,000 K, how much power does a square meter of its
surface radiate? Give your answer in scientific notation with units of W/m². Use the
Stefan-Boltzman constant, o= 5.67 x 10^-8 W/m^2(K^4)

Answer:

i think..its fraction that its have multiple fractions on it..if you minus the 397 000-355 it should be 381+ so i say if you get the 5 multiply it by 9!! so you will get it!

Explanation:

HOPE IT HELPS!!

The object with the greatest kinetic energy is the locomotive engine (option C)

To know the object with the greatest kinetic energy, we shall determine the kinetic energy of each objects. Details below:

For truck:

KE = ½mv²

KE = ½ × 3500 × 30²

KE = 1575000 J

For baseball:

KE = ½mv²

KE = ½ × 0.5 × 46.9²

KE = 549.90 J

For locomotive:

KE = ½mv²

KE = ½ × 205000 × 5²

KE = 2562500 J

For person:

KE = ½mv²

KE = ½ × 73 × 6²

KE = 1314 J

From the above calculations, we can see that the locomotive has the greatest kinetic energy. Thus, the correct answer is option C

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Answer:

We know the momentum after the collision MUST be equal to the momentum BEFORE the collision.  

Momentum is a VECTOR quantity having both magnitude and direction.  The first ball has momentum P =m*v = 2*4 = 8 at 90degrees.  The second ball has momentum P = 1*8 = 8 at -90 or 270 degrees.  They sum to zero when you perform vector addition.

Explanation:

Answer:

The mass will have the most KE at the midpoint of motion (velocity is a maximum)

Total Energy = KE + PE = constant

At zero displacement the potential energy equals zero and the kinetic energy is a maximum.

Answer:

I think it's point C but I'm not sure

Answer:

general steps of performing an autopsy:

1. The body is identified and the relevant information about the deceased is collected.

2. A visual examination of the body is performed to look for any abnormalities or signs of injury.

3. The external examination is followed by an internal examination. The body is opened up to examine the organs, including the brain, heart, lungs, liver, and kidneys, for any signs of disease or injury.

4. The organs are weighed, measured and dissected.

5. Tissue samples are taken and sent for laboratory analysis.

6. The cause of death is determined based on the autopsy findings, and a report is generated.

7. The body is then closed and prepared for release to the family for funeral arrangements.

It is important to note that the specific steps involved may vary depending on the type of autopsy being conducted and the circumstances surrounding the death.

Explanation:

The skater's final angular velocity is approximately 9.86 rad/s.

The skater's final angular velocity can be calculated using the principle of conservation of angular momentum. The equation for angular momentum is given by:

L = Iω

where L is the angular momentum, I is the moment of inertia, and ω is the angular velocity.

Initially, the skater has an angular momentum of:

L_initial = I_initial * ω_initial

Substituting the given values:

L_initial = 2.12 kg m² * 3.25 rad/s

The skater's final angular momentum remains the same, as angular momentum is conserved:

L_final = L_initial

The final moment of inertia is given as 0.699 kg m². Therefore, the final angular velocity can be calculated as:

L_final = I_final * ω_final

0.699 kg m² * ω_final = 2.12 kg m² * 3.25 rad/s

Solving for ω_final:

ω_final = (2.12 kg m² * 3.25 rad/s) / 0.699 kg m²

Hence, the skater's final angular velocity is approximately 9.86 rad/s.

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Answer:

Using Ohm's law, we can calculate the current (I) by dividing the voltage (V) by the resistance (R):

I = V / R

Substituting the given values:

I = 54 V / 3 Ω

I = 18 A

Therefore, the current running through the fan when it's in use is 18 A.

Explanation:

(a) The magnitude and direction of the net force on the crate while it is on the rough surface is 34.7 N in opposite direction.

(b) The net work done on the crate while it is on the rough surface is -22.6 J.

(c) The speed of the crate when it reaches the end is 0.5 m/s.

The magnitude and direction of the net force on the crate while it is on the rough surface is calculated as follows;

F (net) = F - Ff

where;

F (net) = F - μmg

where;

F (net) = 289 N  -   (0.359 x 92 X 9.8)

F (net) = -34.7 N

The negative sign indicates opposite direction to the applied force.

The net work done on the crate while it is on the rough surface is calculated as follows;

W = F(net) x L

where;

W = -34.7 x 0.65

W = -22.6 J

The speed of the crate when it reaches the end is calculated as follows;

acceleration of the crate = F(net) / m

a = -34.7 N / 92 kg

a = -0.377 m/s²

v² = u² + 2aL

v² = ( 0.855)²  +  ( 2 x -0.377 x 0.65)

v² = ( 0.855)²   - ( 2 x 0.377 x 0.65)

v² = 0.24

v = √ 0.24

v = 0.5 m/s

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Given that the spring constant of the ligament is

The displacement of the ligament is

We have to find elastic energy.

Elastic energy is given by the formula

Substituting the values, the elastic energy will be

Thus, the elastic energy of the ligament is 5.85 J.

Explanation

let

Step 1

Part A)Find −7u • v.

the dot product is the sum of the products of the corresponding entries of the two sequences of numbers,and to multiply a vector by a scalar, multiply each component by the scalar.

so

therefore, replacing

So,Part A

Step 2

Part B ,Use the dot product to determine if u and w are parallel, orthogonal, or neither

the dot product is also given by:

a) find the magnitude of the vectors

and

c) dot product

finally, replace in the formula and find the angle

so

the vectors are orthogonal ( make a 90° angle)

I hope this helps you

The notation that is commonly used on force diagrams to show forces acting on an object is FD.

A free body diagram is a diagram that contains all the forces acting on an object.

These forces acting on an object include the following :

Thus, the notation that is commonly used on force diagrams to show forces acting on an object is FD.

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Answer:351

Explanation:trust

A musical note has a frequency and the wavelength of the note. The speed of the sound of that note will be 351m/s. The correct option is G.

The frequency is the number of cycle per second.

The wavelength is related to frequency and speed as

f = v/λ

Given is the frequency f = 512Hz and wavelength λ= 0.685m, then the speed of note will be

v =512 Hz x 0.685m

v =350.72 m/s

Speed is approximately 35 m/s.

Thus,  the correct option is G.

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The mass of the cold water, given the data from the question is 500 g

Heat loss = Heat gain

MᵥᵥC(Tᵥᵥ – Tₑ) = M꜀C(Tₑ – T꜀)

200 × 4.184 (75 – 25) = M꜀ × 4.184(25 – 5)

41840 = M꜀ × 83.68

Divide both side 83.68

M꜀ = 41840 / 83.68

M꜀ = 500 g

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Answer:

In its most general sense, a picture is a visual representation of something, especially in the form of a painting, drawing, photograph, or the like. A picture can also refer to a mental image, among other senses.

We can use the formula for angular deceleration to find the time interval needed for the wheel to come to a complete stop:

α = (ωf - ωo) / Δt

where ωf is the final angular velocity, ωo is the initial angular velocity, and Δt is the time interval. Rearranging the formula, we get:

Δt = (ωf - ωo) / α

Since the wheel comes to a complete stop, the final angular velocity is zero:

ωf = 0

Substituting the given values, we get:

Δt = (0 - 34.28) / (-1.77) ≈ 19.37 s

The formula for angular displacement is:

θ = ωo t + (1/2) α t^2

where θ is the angular displacement, ωo is the initial angular velocity, α is the angular acceleration, and t is the time interval. When the wheel comes to a complete stop, the final angular velocity is zero, so the formula simplifies to:

θ = ωo t + (1/2) α t^2

Substituting the given values, we get:

θ = (34.28 rad/s)(19.37 s) + (1/2)(-1.77 rad/s^2)(19.37 s)^2 ≈ -2003.9 rad

The negative sign indicates that the wheel has rotated in the opposite direction of its initial motion.

To get the total angular distance traveled by the wheel during this time interval, we take the absolute value of θ:

|θ| = |-2003.9 rad| = 2003.9 rad

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Answer:

192.6N

Explanation:

Let's consider the forces acting on the beam:

Weight of the beam (W): It acts vertically downward and has a magnitude of W = mass * gravitational acceleration = 39.4 kg * 9.8 m/s^2.

Force exerted by the link on the beam (F_link): It acts at an angle of 90 degrees with respect to the beam and has two components: the vertical component and the horizontal component.

Tension in the cable (T): It supports the far end of the beam and acts at an angle of 90 degrees with respect to the beam. Since the angle between the beam and the cable is 90 degrees, the tension in the cable only has a vertical component.

Let's break down the forces acting on the beam:

Vertical forces:

W (weight of the beam) - T (vertical component of tension) = 0

T = W

Horizontal forces:

F_link (horizontal component of the force exerted by the link) = ?

To find the magnitude of the horizontal component of the force exerted by the link on the beam (F_link), we need to consider the equilibrium of forces in the horizontal direction.

Since the beam is inclined at an angle of θ = 33.1 degrees with respect to the horizontal, the horizontal equilibrium equation can be written as:

F_link = W * sin(θ)

Let's substitute the given values:

W = 39.4 kg * 9.8 m/s^2

θ = 33.1 degrees

F_link ≈ (39.4 kg * 9.8 m/s^2) * sin(33.1 degrees)

Using a calculator, we find that the magnitude of the horizontal component of the force exerted by the link on the beam (F_link) is approximately 192.6 N.

An Ion carrying a charge of -1 indicates the presence of an extra electron.

Atoms are formed by the combination of protons, neutrons, and electrons. Protons and Neutrons together form the Nucleus, and the Electrons move around the Nucleus of the atoms in a shell and can vary in number.

The number of protons and electrons is the same in an atom. As the protons have a charge of +1 and electrons carry a negative charge of -1, thus the total charge of an atom is zero means an atom is electrically neutral.

But when an atom gains an extra electron from its nearby atoms or surroundings, it gains a negative charge of -1. An atom that has a positive or negative electrical charge is an Ion. Thus an ion with a -1 charge is an atom with an extra electron in its shell.

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The hiker travelled 4.02 km North/South and 4.74 km East/West during her hike.

This question involves vector addition, the resolution of vectors, the use of bearings, and trigonometry in the calculation of the hiker's movement.

This may appear to be a difficult problem, but with some visual aid and the proper use of mathematical formulas, the issue can be addressed correctly.

Resolution of VectorThe resolution of a vector is the process of dividing it into two or more components.

The angle between the resultant and the given vector is equal to the inverse tangent of the two rectangular components.

Angles will always be expressed in degrees in the solution.

The sine, cosine, and tangent functions in trigonometry are denoted by sin, cos, and tan.

The tangent function can be calculated using the sine and cosine functions as tan x = sin x/cos x. Also, in right-angled triangles, Pythagoras’ theorem is used to find the hypotenuse or one of the legs.

Distance Travelled North/SouthThe hiker traveled North for the first part of the hike and South for the second.

The angles that the hiker traveled in the first part and second parts are 53 degrees and 17 degrees, respectively.

The angle between the two is (180 - 53 - 17) = 110 degrees.

The angle between the resultant and the Northern direction is 110 - 53 = 57 degrees.

Using sine and cosine, we can calculate the north/south distance traveled to be 5 sin 57 = 4.02 km, and the east/west distance to be 5 cos 57 = 2.93 km.

Distance Travelled East/WestThe hiker walked East for the second part of the hike.

To calculate the distance travelled East/West, we must first calculate the component of the first part that was East/West.

The angle between the vector and the Eastern direction is 90 - 53 = 37 degrees.

Using sine and cosine, we can calculate that the distance travelled East/West for the first part of the hike is 5 cos 37 = 3.88 km.

To determine the net distance travelled East/West, we must combine this component with the distance travelled East/West in the second part of the hike.

The angle between the second vector and the Eastern direction is 17 degrees.

Using sine and cosine, we can calculate the distance traveled East/West to be 3 sin 17 = 0.86 km.

The net distance traveled East/West is 3.88 + 0.86 = 4.74 km.

Therefore, the hiker travelled 4.02 km North/South and 4.74 km East/West during her hike.

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A beaver runs at a speed of 2.0 m/s with 45 J of kinetic energy, then the mass is approximately 1.74 kg, and this can be calculated by using the  kinetic energy (KE) of an object that is KE = (1/2) ×m × \(v^2\).

KE = (1/2) ×m × \(v^2\).

where m= mass of the object, v=its velocity.

The beaver runs at a speed of 2.0 m/s with 45 J of kinetic energy. Substituting these values into the above equation

45 J = (1/2) ×m × \((2.0 m/s)^2\)

Simplifying this equation:

45 J = (1/2) × m × 4.0\(m^2/s^2\)

45 J = 2 m × 2 \(m^2/s^2\)

45 J = 4 \(m^3/s^2\)

\(m^3\) = 45 J / 4 \(s^2\)

\(m^3\) = 11.25 kg×\(m^2/s^2\)

Taking the cube root of both sides to solve for mass,

m = (11.25 kg×\(m^2/s^2)^(^1^/^3^)\)

m = 1.74 kg (rounded to two decimal places)

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Answer:

I am 15th in my state for 55m hurdles with a time of 10.4 seconds

Explanation:

BAM

Answer: 44 m per minute

Explanation:

Answer:

300km

Explanation:

Given parameters:

Speed of the car  = 100km/h

Time taken for the travel  = 3hrs

Unknown:

How far did it travel  = ?

Solution:

To solve this problem, we must understand that;

        Speed  = \(\frac{distance}{time}\)  

 Distance  = speed x time

 Distance  = 100km/hr x 3hr = 300km

The rotational velocity of the centrifuge is \(\sqrt{5}\) rad/s.

Centripetal force is defined as the force that acts on a body moving in circular path which is directed towards the centre of the circular path.

Here,

The rotational acceleration attained by the astronauts, a' = 100 m/s²

The radius of the centrifuge, r = 20 m

From the equation of circular motion,

       a' = rω²

So,  ω² = a'/r

      ω² = 100/20

      ω² = 5

Rotational velocity, ω = \(\sqrt{5}\) rad/s

Hence,

The rotational velocity of the centrifuge, ω is \(\sqrt{5}\) rad/s

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Answer:

Particles in a: gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

i hope this helps your answer

Answer:

liquids vibrate, move about, and slide past each other. solids vibrate but generally do not move from place to place.

Answer:

s the charge is positive, the electric field lines leave it at the point a d = 0.034 cm, the electric field lines go to the right.

Explanation:

The electric field around the cagases oisitvi, field leaving this means that the field lines move away from

If the charge is negative the lines of the field are directed towards the charge

Let's apply this to our case, as the charge is positive, the electric field lines leave it at the point a d = 0.034 cm, the electric field lines go to the right.

Answer:

A light wave will not stop if it enters a new medium perpendicular to the surface.

Explanation:

A light wave will not have any deviation if it enters a new medium perpendicular to the surface.

Refraction is defined as an optical phenomenon by which the direction of a light wave gets changed when it travels from one medium to another. This is because of the change in speed.

Here,

The light wave is entering a new medium such that it enters perpendicular to the surface. Angle of incidence is the angle between the incident ray and the line perpendicular to the surface at the point of incidence. Since, here the light ray is incident normal to the surface that means the angle of incidence is 0.

According to Snell's law,

sin i = μ sin r

where i is the angle of incidence, r is the angle of refraction and μ is the constant called refractive index.

As i = 0, sin i = 0

So, μ sin r = 0

Since μ is a constant, we can say that sin r = 0 or the angle of refraction,

r = 0

This means that there is no refraction and hence the light wave won't get deviated when it enters the medium normally.

Hence,

A light wave will not have any deviation if it enters a new medium perpendicular to the surface.

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Answer:

An object is considered to be in motion only when its position changes over time with reference to a point which will be known as orgin

Answer: 10 m/s

Explanation: Velocity/Time

50/5= 10

:)