6845 rounded to three significant figures.

Answer:

C

Explanation:

because cooling down makes your blood flow through your body much easier and fatser.

Answer:

C.It keeps your blood flowing evenly.

Explanation:

The intensity of UV-B radiation at a depth of 100 cm is approximately 0.25 watts/m2.

The intensity of UV-B radiation at a depth of 100 cm can be calculated by using the formula given below;

I = Io e-k x Where I = intensity at a depth of x Io = intensity at the surface k = absorption coefficient x = depth

In the given problem ;Io = 0.27 watts/m2x = 100 cm = 1 m k = 0.027Using these values in the above formula we get ;I = 0.27 e^(-0.027 × 1)≈ 0.25 watts/m2
Therefore, the intensity of UV-B radiation at a depth of 100 cm is approximately 0.25 watts/m2.

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a) The scale would show an apparent weight of 961.0N  ; b) Scale would show an apparent weight of 435.8N.

Rate at which velocity of any object changes with time is called acceleration and it is vector quantity.

a. When the elevator starts to accelerate upwards at 3.0m/s², apparent weight of the person on scale will be:

Apparent weight = (mass of the person) x (acceleration due to gravity + acceleration of the elevator)

= 75kg x (9.81m/s² + 3.0m/s²)

= 75kg x 12.81m/s²

Apparent weight = 961.0N

Therefore, scale would show an apparent weight of 961.0N.

b. When the elevator starts to accelerate downwards at 4.0m/s², apparent weight of the person on the scale will be:

Apparent weight = (mass of the person) x (acceleration due to gravity - acceleration of the elevator)

= 75kg x (9.81m/s² - 4.0m/s²)

= 75kg x 5.81m/s²

Apparent weight = 435.8N

Therefore, scale would show an apparent weight of 435.8N.

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Answer:

as we know

p=1/f

p=1/-40m

p=  -0.025d

you have written the unit of focal length wrong it is the unit of power

please mark as brainliest plzzzzzzzzzz

Answer:

Explanation:

Using the formula for heart capacity;

Q = mcΔt

m is the mass = 150g = 0.15kg

initial temperature = 22°C

Quantity of heat = 3240J = 3.24kJ

specific heat capacity of ethanol = 2.57 [kJ/kg K]

Substitute and get the final temperature

3.240 = 0.15(2.57)(T - 22)

3.240 = 0.3855(T-22)

3.240/0.3855 = T - 22

8.405 = T - 22

T = 22+8.405

T = 30.405°C

Hence the final temperature of the ethanol if 3240 J was needed to raise the temperature of the ethanol is 30.405°C

(a) The wavelength of the radiation diffracted at the blaze angle in the first, and fourth, is 5400 nm

(b) The resolving power of the grating in the first, fourth, and ninth orders are 6000, 24000, and 54000, respectively.

To solve this problem, we'll use the formula for the grating equation:

mλ = d(sinθᵢ ± sinθₒ),

where:

a) Wavelength of the radiation diffracted at the blaze angle:

First order (m = 1):

θᵢ = 45.00°, θₒ = 90.00° (blaze angle is 45.00°)

Using the grating equation:

1λ = (1 / (600.0 grooves/mm)) x (sin(45.00°) + sin(90.00°))

λ = 1.000 / (600.0 x (sin(45.00°) + sin(90.00°)))

λ ≈ 600 nm

Fourth order (m = 4):

θᵢ = 0° (normal incidence), θₒ = 180.00° (opposite direction)

Using the grating equation:

4λ = (1 / (600.0 grooves/mm)) * (sin(0°) + sin(180.00°))

λ = 4.000 / (600.0 * (sin(0°) + sin(180.00°)))

λ ≈ 2400 nm

Ninth order (m = 9):

θᵢ = 0° (normal incidence), θₒ = 180.00° (opposite direction)

Using the grating equation:

9λ = (1 / (600.0 grooves/mm)) x (sin(0°) + sin(180.00°))

λ = 9.000 / (600.0 x (sin(0°) + sin(180.00°)))

λ ≈ 5400 nm

b) Resolving power of the grating:

The resolving power (R) of a grating is given by the formula:

R = mN,

where N is the total number of lines on the grating.

For this grating, N is the number of grooves per unit length multiplied by the width of the ruled area.

N = (600.0 grooves/mm) x (10.40 cm)

N = 6000 grooves

Resolving power in the first order:

R₁ = 1 x 6000

R₁ = 6000

Resolving power in the fourth order:

R₄ = 4 x 6000

R₄ = 24000

Resolving power in the ninth order:

R₉ = 9 x 6000

R₉ = 54000

Therefore, the resolving power of the grating in the first, fourth, and ninth orders are 6000, 24000, and 54000, respectively.

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The correct option is D, The one of statements concerning a convex mirror is true. The picture might be toward the replicate than one produced with the aid of a plane mirror in its vicinity.

A convex mirror, also known as a diverging mirror, is a curved mirror that bulges outward. Unlike a concave mirror, which curves inward and can focus light to create real images, a convex mirror reflects light outwards and cannot create real images.

Convex mirrors are commonly used in situations where a wide field of view is required, such as in car side mirrors, security mirrors, and in stores to help prevent theft. The bulging surface of the mirror allows it to reflect a wider angle of light than a flat mirror or concave mirror would, making it useful for surveillance and safety purposes. Due to their unique reflective properties, convex mirrors can also produce virtual images that appear smaller and farther away than the actual object being reflected.

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Complete Question: -

Which one of the following statements concerning a convex mirror is true?

a) Such mirrors are always a portion of a large sphere.

b) The image formed by the mirror is sometimes a real image.

c) The image will be larger than one produced by a plane mirror in its place.

d) The image will be closer to the mirror than one produced by a plane mirror in its place.

e) The image will always be inverted relative to the object.

Answer: D. Is the jelly like fluid within a cell

watch the cell rap

When a soap bubble 100 nm thick and illuminated by white light incident perpendicular to its surface, then wavelength, λ is calculated =  5.32 *10^-7 m.

The ratio of the speed of light in a vacuum, c, to the speed of light in a medium, c' is called as index of refraction. One of the consequence of this difference in speed is that when light goes from one medium to another at an angle, then the propagation vector in the new medium has a different angle with respect to normal.

Given, t= 100nm= 100 * 10 ^-9  n= 1.33

ΔФ1 = λ/4

ΔФ2 = 2√2 t λ n/2 λ

=2 t n

=2 * 100 * 10 ^-9 * 1.33

= 2.66 *10^-7

2.66 *10^-7= λ/2

λ=  5.32 *10^-7 m.

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Answer:

100

Explanation:

Displacement is the shortest line between the starting point and the ending point

so , the starting point is "A"

,the ending point is "C"

so "AC" = AB - CB = 300 - 200 = "100"

Answer:

physics is the study of functions, systems and and the explainable reasons why they do what they do.

Answer:

physics is the branch of science concerned with the nature and properties of matter and energy. it includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.

Small particles of organic material are called c. detritus.

Small particles of organic material are called detritus. Detritus consists of dead plant and animal material that has broken down into smaller particles such as animal waste, leaves, fallen branches which are broken down by decomposers such as bacteria and fungi. It is an important source of nutrients for many organisms in aquatic and terrestrial ecosystems.

Option a, discharge, refers to the release of a substance, such as wastewater, into the environment. Option b, peat, is a type of soil made up of partially decomposed plant material. Option d, brackish, refers to water that is a mix of freshwater and saltwater. Therefore, the best answer from the choices provided is c. detritus.

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Answer:

d

Explanation:

I really don't know how to explain

A. The average drift speed of the electrons in the wire is  1.19 x \(10^{-3}\)cm/s.

B. The time it would take an electron to travel 8.84 m is 7.43 x \(10^{5}\)sec

(A) To find the average drift speed of electrons in a wire, we can use the equation:

I = nAvq

Where:
I is the current in Amperes
n is the electron density in electrons per \(cm^{3}\)
A is the cross-sectional area of the wire in \(cm^{2}\)
v is the average drift velocity of electrons in cm/s
q is the charge of an electron, which is 1.6 x \(10^{-19}\) Coulombs

First, we need to find the cross-sectional area of the wire. The formula for the area of a circle is:

A = π\(r^{2}\)

Where:
A is the area of the circle
r is the radius of the circle

Given that the wire diameter is 1.63 mm, we can find the radius by dividing it by 2:

r = 1.63 mm / 2 = 0.815 mm = 0.0815 cm

Now, we can calculate the area:

A = \(π(0.0815 cm)^{2}\) = 0.0209 \(cm^{2}\)

Next, we can rearrange the equation to solve for v:

v = I / (nAq)

Given that the current is 20 A and the electron density is 8.47 x \(10^{24}\)electrons per \(cm^{3}\), we can substitute these values into the equation:

v = 20 A / (8.47 x \(10^{24}\) electrons per cm^3 * 0.0209 cm^2 * 1.6 x \(10^{-19}\) C)

Simplifying the expression:

v = 1.19 x \(10^{-3}\) cm/s

Therefore, the average drift speed of electrons in the 14 gauge wire carrying a maximum current of 20 A is approximately 1.19 x \(10^{-3}\) cm/s.

(B) To calculate the time it would take for an electron to travel a distance of 8.84 m, we can use the formula:

t = d / v

Where:
t is the time in seconds
d is the distance in meters
v is the average drift velocity of electrons in meters per second

Given that the distance is 8.84 m and the average drift velocity is 1.19 x 10^-3 cm/s, we need to convert the velocity to meters per second:

v = 1.19 x \(10^{-3}\) cm/s * 0.01 m/cm = 1.19 x \(10^{-5}\) m/s

Now, we can substitute the values into the formula:

t = 8.84 m / 1.19 x \(10^{-5}\)m/s

Simplifying the expression:

t = 7.43 x \(10^{5}\)s

Therefore, it would take approximately 7.43 x \(10^{5}\) seconds for an electron to travel a distance of 8.84 m.

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I = 7 N-s

Explanation:

Impulse is defined as

I = ∆p = m(vf - vi)

We are given

m = 0.2 kg

vi = -10 m/s (to the left)

vf = +25 m/s (to the right)

Therefore, the impulse imparted on the puck is

I = (0.2 kg)[25 m/s - (-10 m/s)]

= (0.2 kg)(35 m/s)

= 7 N-s

Explanation:

The mass of a body is its inertia or resistance to change of motion. Mass can therefore be measured either by the amount of force necessary to impart to the body a given motion in a given time or by the acceleration produced by a given force. ...

Answer:

The gravitational acceleration energy of an item increases as it rises in altitude.

Explanation: Hope this helps :D

a) The velocity when it return to the ground is 9 m/s

b) The total time taken is 1.84 s

c) The highest distance covered is 4.2 m

We have to know that when an object has been projected upwards or downwards that the movement of the objects could be described by the use of the equations of motion under gravity. In that case we have to look at that tennis ball is thrown vertically upward with an initial velocity of +9.0

m/s as an object that is undergoing motion under gravity.

We now have;

The time taken for the ball to reach the starting point;

v = u - gt

At the maximum height the ball is stationary thus v = 0 m/s

t =u/g

t = 9.0 m/s / 9.8 m/s^2

t = 0.92 s

Given that the ball went up and came down the time taken to return to starting point = 2(0.92) = 1.84 s

The highest distance covered by the ball is obtained from;

h = ut - 1/2gt^2

h = 9 * 0.92 - (0.5 * 9.8 * (0.92)^2)

h = 8.3  - 4.1

h = 4.2 m

The highest distance covered is 4.2 m

The balls speed when it returns;

Recall that it now falls from a height thus u = 0 m/s

v = u + gt

v = gt

v = 9.8 * 0.92

v = 9 m/s

The velocity when it return to the ground is 9 m/s

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Answer:x rays are electromagnetic waves.

x rays are transverse waves

x rays travel at the speed of light

Explanation:

Answer:

By applying relative small force to the smaller piston

Explanation:

If a car sits on top of the large piston, it can be lifted by applying a relatively small force to the smaller piston, the ratio of the forces being equal to the ratio of the areas of the pistons

Answer:

melanie ran 8.3 meters per second

Explanation:

I think thats right, hope it helps.

Mum's showing me the Ancient Egypt room. We're in awe of the fascinating artifacts and historical significance they hold.

As we explore the Ancient Egypt room, we are captivated by the rich cultural heritage and the remnants of an ancient civilization that once thrived along the Nile River. The artifacts on display offer a glimpse into the lives of the pharaohs**, the majestic pyramids, intricate hieroglyphics, and the religious beliefs of the ancient Egyptians. The room is adorned with statues, jewelry, burial artifacts, and mummified remains, all of which evoke a sense of wonder and admiration for this ancient civilization that flourished thousands of years ago. We feel privileged to witness and learn from these remarkable relics that connect us to a distant era of human history.

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Answer:

The 5-number summary is

1. Median = 0.93 W/kg

2. Lower quartile = 0.69 W/kg

3. Upper quartile = 1.16 W/kg

4. Minimum value = 0.54 W/kg

5. Maximum value = 1.42 W/kg

Explanation:

We are given the measured radiation absorption rates​ (in W/kg) corresponding to 11 cell phones.

1.16 0.85 0.69 0.75 0.95 0.93 1.18 1.17 1.42 0.54 0.57

What is 5-number summary?

A 5-number summary refers to a box plot that basically shows 5 statistical characteristics of a data set.

These statistical characteristics are:    

1. Median

2. Lower quartile

3. Upper quartile  

4. Minimum value  

5. Maximum value  

1. Median:

Arrange the data in ascending order

0.54 0.57 0.69 0.75 0.85 0.93 0.95 1.16 1.17 1.18 1.42

(n+1)/2 gives the median value of the data set.

(11 + 1)/2 = 6th position

Therefore, 0.93 W/kg is the median of the data set.

2. Lower quartile:

Divide the data set into two equal halfs (include median in both if n = odd)

Lower half = 0.54 0.57 0.69 0.75 0.85 0.93

Upper half = 0.93 0.95 1.16 1.17 1.18 1.42

The lower quartile is the median of the lower half of the data set.

Lower half = 0.54 0.57 0.69 0.75 0.85 0.93

The median is 6/2 = 3rd position

Therefore, the lower quartile of the data set is 0.69 W/kg

3. Upper quartile:

Divide the data set into two equal halfs (include median in both if n = odd)

Lower half = 0.54 0.57 0.69 0.75 0.85 0.93

Upper half = 0.93 0.95 1.16 1.17 1.18 1.42

The upper quartile is the median of the lower half of the data set.

Upper half = 0.93 0.95 1.16 1.17 1.18 1.42

The median is 6/2 = 3rd position

Therefore, the upper quartile of the data set is 1.16 W/kg

4. Minimum value:

The minimum value is the least value in the data set.

0.54 0.57 0.69 0.75 0.85 0.93 0.95 1.16 1.17 1.18 1.42

Therefore, the minimum value of the data set is 0.54 W/kg

5. Maximum value  

The maximum value is the least value in the data set.

0.54 0.57 0.69 0.75 0.85 0.93 0.95 1.16 1.17 1.18 1.42

Therefore, the maximum value of the data set is 1.42 W/kg

The box plot is illustrated in the attached diagram.

Answer:

To add two non-collinear vectors, you first need to draw them on a coordinate plane so that their tails are at the same point. Then, you can use the "tip-to-tail" method to add the vectors. This involves drawing a vector from the tail of the first vector to the tip of the second vector, and this new vector is the sum of the two original vectors.

For example, if you have two non-collinear vectors, A and B, and you want to find their sum, you would first draw them on a coordinate plane so that their tails are at the same point. Then, you would draw a vector from the tail of vector A to the tip of vector B. This new vector, which is the sum of vectors A and B, is the result of adding the two vectors.

To calculate the sum of the vectors using the tip-to-tail method, you would simply add the x and y components of the two vectors separately. For example, if vector A has an x component of 3 and a y component of 4, and vector B has an x component of 5 and a y component of 6, the sum of the two vectors would be a vector with an x component of 8 and a y component of 10.

It's important to note that the sum of two non-collinear vectors is not necessarily a non-collinear vector. The sum of two non-collinear vectors can be a non-collinear vector, a collinear vector, or a zero vector (if the two original vectors are opposites of each other).

Evaluate skill performance against a scale is known as Rubrics; option D

Performance evaluation is the systematic process of assessing the performance of an individual in a certain task, skill or job.

Performance evaluation is done against a set of standard measurements or a rating scale known as Rubrics.

Rubrics use a set of specific criteria to evaluate an individual student or a group of students performance in a certain task assigned to them.

Rubrics use  a rating system where points or scores are awarded depending on the skillset level or ability demonstrated.

In conclusion, rubrics are used to evaluate performance.

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The general term for a device that transforms the energy of an electric current into another useful form of energy is an electrical transducer.

Electrical transducers are used to convert energy of one kind into energy of another, such as converting electrical energy into mechanical energy or vice versa. They can also be used to convert energy from one form to another, such as converting electrical energy into heat, light, or sound.

Electrical transducers have a wide range of applications, from powering small household appliances to providing power to large industrial machines and even providing power to vehicles. For example, a car’s alternator is an electrical transducer that converts mechanical energy from the car’s engine into electrical energy to power the car’s electrical systems.

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Answer:

Explanation:

Main Answer:

The equation acceleration = v/time can be proven using the fundamental definitions of acceleration, velocity, and time. Acceleration is defined as the rate of change of velocity, and velocity is the rate of change of displacement with respect to time. Let's consider an object moving with an initial velocity v0 and final velocity v in a time interval t.

Explanation:

The change in velocity, Δv, can be calculated as the final velocity minus the initial velocity, Δv = v - v0. Similarly, the change in time, Δt, is the final time minus the initial time, Δt = t - t0.

By substituting these values into the equation for acceleration, we have:

acceleration = Δv/Δt

Now, substituting Δv = v - v0 and Δt = t - t0, we get:

acceleration = (v - v0)/(t - t0)

Since v0 and t0 represent the initial velocity and time, respectively, we can rewrite the equation as:

acceleration = (v - v0)/t

By rearranging the equation, we find:

acceleration = v/t

Thus, we have proved that acceleration is equal to v/time.

Internal Link:

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Answer:

the question is so big and it