Which type of wave is more dangerous for humans? Microwaves or x-rays?
Answers
Answer:
x-rays
Explanation:
Related Questions
Mary Jo went on riding her horse through the trails. Her pace was 8 km/hr. She left at 8:30 am and got back to the barn at 9:00 am. How far did she go?
Question 4 options:
16 m/s
4 m/s
4 km
16 km
Answers
Answer:
4km
Explanation:
Distance=speed x time
Knowing this we know the time and speed
so it is 8 x .5= D
And 8 x .5 =4
If you have any questions let me know
Explain the method to measure the external diameter of a sphere
Answers
Answer:
Sphere is a geometrical object in dimensional space that surface of a circle and ball.
Explanation:
Sphere is that the circular objects in the two dimensional space (1) circle
(2) disk. Two dimensional space is a set of points and the distance of that point,The two points of Sphere that length and center.
Sphere can constructed as the named of surface form circle about any diameter. circle is the special type of the revolution replacing the circle,
sphere is the distance r is the radius of the ball and circle is the center of mathematical ball,as the center and the radius of the sphere is to respectively.
The ball and sphere has not be maintained mathematical references as a solid references. A sphere of any radius is centered at the number of zero.
A whale swims at a constant speed of 8 m/s for 17 s. What distance did the whale travel in km?
Answers
Answer:
0.136 kmExplanation:
whale speed = 8 m/s for 17 sec.
find distance traveled in km
distance = velocity x time
= 8 m/sec. x 17 sec.
= 136 meters x 1 km
1000 meters
= 0.136 km
suppose your bathroom scale reads your mass is 55 kg, with a 1% uncertainty. what is the uncertainty in your mass in kilograms?
Answers
Answer:
± .55 kg
Explanation:
55 * 1% = .55 kg
± .55 kg
A siren emits a sound at 1700 Hz. Assume the air temperature is 30oC. What frequency would a stationary observer hear if the car with the siren is travelling at:A. 25 m/s towards the observerB. 25 m/s away from the observerC. 140 km/h towards the observer
Answers
Given data:
* The actual frequency of the sound is f = 1700 Hz.
* The value of the temperature is T = 30 degrees C.
Solution:
The speed of the sound at the given temperature is,
\(v_{}=\text{ 349.1 m/s}\)(a). By Doppler's effect, the frequency of the sound heard by the observer is,
\(f^{\prime}=f(\frac{v}{v-v_s})\)where v_s is the speed of the source,
Substituting the known values,
\(\begin{gathered} f^{\prime}=1700\times(\frac{349.1}{349.1-25}) \\ f^{\prime}=1700\times(\frac{349.1}{324.1}) \\ f^{\prime}=1831.13\text{ Hz} \end{gathered}\)Thus, the frequency of the sound heard by the observer is 1831.13 Hz.
(b). When the car is moving away from the observer, thus, by Doppler's effect, the frequency of the sound heard by the observer is,
\(f^{\prime}=f(\frac{v}{v+v_s})\)Substituting the known values,
\(\begin{gathered} f^{\prime}=1700\times(\frac{349.1}{349.1+25}) \\ f^{\prime}=1700\times\frac{349.1}{374.1} \\ f^{\prime}=1586.4\text{ Hz} \end{gathered}\)Thus, the frequency of the sound heard by the observer is 1586.4 Hz.
(c). The car is moving towards the observer with the speed of,
\(\begin{gathered} v_{\text{s}}=140\text{ km/h} \\ v_s=140\times\frac{1000}{60\times60} \\ v_s=38.89\text{ m/s} \end{gathered}\)By Doppler's effect, the frequency of the sound heard by the observer is,
\(f^{\prime}=f\times\frac{v}{v-v_s}\)Substituting the known values,
\(\begin{gathered} f^{\prime}=1700\times\frac{349.1}{349.1-38.89} \\ f^{\prime}=1700\times\frac{349.1}{310.21} \\ f^{\prime}=1913.12\text{ Hz} \end{gathered}\)Thus, the frequency of the sound heard by the observer is 1913.12 Hz.
how do i mark some one as the brainlyst?
Answers
You'll See After You Have an Answer!
Explanation:
For instance, on my answer, you'll see a button presenting the words "Mark Brainliest"
when can you treat a moving object as if it were a point like particle
Answers
A moving object can be treated as if it were a point-like particle when its size is much smaller than the distance over which it moves and the acceleration it undergoes.
This concept is often used in physics to simplify calculations and make them more manageable. However, it is important to note that this assumption may not always hold true and may lead to inaccurate results in certain situations.
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Sam ran a 2000-meter race. He started at 9:00 AM and finished at 9:05 AM.
He started out fast but slowed down toward the end. Calculate Sam’s
average speed during the race.
Answers
Answer: Approximately 6.67 meters per second.
Explanation:
Speed is a quantity measured in meters per second, so because the elapsed time is 5 minutes, let's turn it into seconds. 5 minutes multiplied by 60 seconds is 300 seconds.
2000 meters divided by 300 seconds is about 6.67 meters per second, which is the speed.
a vehicle start to move from rest and attains and asculation of 0.8 M per second square in 10 second calculate the final velocity and distance covered by the vehicle within that time
Answers
Answer:
the final velocity is 8m/s and distance covered by the vehicle within the 10s is 40m.
Explanation:
using the equations of motion.
The final velocity can be calculated using the equation:
v = u + at
where:
v = final velocity
u = initial velocity (since the vehicle starts from rest, the initial velocity u is 0)
a = acceleration
t = time
Given:
a = 0.8 m/s^2 (acceleration)
t = 10 s (time)
Plugging in the values, we have:
v = 0 + (0.8 ) * 10
v = 8 m/s
So, the final velocity of the vehicle after 10 seconds is 8 m/s.
2. Distance covered (s):
The distance covered can be calculated using the equation:
s = ut + (1/2)at^2
where:
s = distance covered
u = initial velocity
a = acceleration
t = time
Given:
u = 0 m/s (initial velocity)
a = 0.8 m/s^2 (acceleration)
t = 10 s (time)
Plugging in the values, we have:
s = (0 ) * 10 + (1/2)(0.8 )(10 )^2
s = 0 + (1/2)(0.8 )(100 )c
s = 40 m
So, the vehicle covers a distance of 40 meters within the given 10 seconds.
A power shovel did 24000j of work, exerting force of 4000n. how high did the shovel lift the load?
Answers
The height at which the power shovel lifted the load is 6 meters.
What is the height of the load?Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;
Work done = force × distance
Given the data in the question;
Force = 4000N = 4000kgm/s²Work done = 24000J = 24000kgm²/s²Height h = ?Plug the given values into the above formula and solve for the height.
Work done = force × distance
24000kgm²/s² = 4000kgm/s² × h
h = 24000kgm²/s² ÷ 4000kgm/s²
h = 6m
Therefore, the value of the height is 6 meters.
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Why is Pizza so good?
Answers
Answer:
its the cheese
Explanation:
true or false if false correct the false statements :
a- the transformation of electric energy into themal energy is called joule's effect.
b - when a liquid is at rest , the pressure is at the same at any point within this liquid
Answers
Answer:
both statements are truth
Explanation:
a-The Joule effect, also called Joule's law, is the thermal manifestation of electrical resistance. ... In all these cases, it is intended to generate thermal energy with electricity passing through its conductors. This heat they give off is due to the Joule effect.
b-sure of a liquid tank depends only on the density of the liquid and depth from the free surface. It is a scalar quantity and is same in all directions, at a point.
object with more momentum will take
What is the momentum of a 60 kg man running at a velocity of 4 m/s? -
Answers
Answer:
240 kg * m/s
Explanation:
Given
mass (m) = 60 kg
velocity (v) = 4 m/s
Momentum = ?
We know that
Momentum is the product of mass and velocity so
Momentum = m * v
= 60 * 4
= 240 kg * m/s
Hope it helps :)
A gauge is reading the pressure at the bottom of a river, at a depth of 6 m. Would the reading be greater or smaller than the reading at the bottom of a lake at the same depth? You must provide a clear explanation for full credit.
Answers
Answer:
The pressure at the bottom of the river is less than that at the bottom of the lake.
Explanation:
From Bernoulli's equation, the pressure difference is given by
ΔP = ρgΔh + ρ(v₂² - v₁²)/2 where ρ = density of water, g = acceleration due to gravity, Δh = depth, v₁ = velocity at top, v₂ = velocity at bottom
For the lake, v₁ = v₂, since the velocity at the top and bottom are the same. So,
ΔP₁ = ρgΔh + ρ(v₁² - v₁²)/2 = ρgΔh + 0 = ρgΔh
P₂ - P₁ = ρgΔh
P₂ = P₁ + ρgΔh
For the river, v₁ < v₂, since the velocity at the top of the river is greater than at the bottom.
So,
ΔP₂ = ρgΔh + ρ(v₂² - v₁²)/2.
Since v₁ < v₂, ρ(v₂² - v₁²)/2 will be negative,
So,
ΔP₂ = ρgΔh - ρ(v₂² - v₁²)/2.
Since ρ(v₂² - v₁²)/2 is negative, making ΔP less than that in the lake.
So, ΔP₂ = ΔP₁ - ρ(v₂² - v₁²)/2.
ΔP₂ = P₃ - P₁
P₃ - P₁ = P₂ - P₁ - ρ(v₂² - v₁²)/2.
P₃ = P₂ - ρ(v₂² - v₁²)/2.
where P₃ = pressure at bottom of the river and P₂ = pressure at bottom of the lake and P₁ = atmospheric pressure at top of river and lake respectively.
Since the factor ρ(v₂² - v₁²)/2 is removed from the pressure at the bottom of the lake, the pressure at the bottom of the river is therefore less than that at the bottom of the lake.
A biker has a PE of 360 J at the top of a hill. On the way down the hill, she lost 150 J to heat.
What is her KE at the bottom of the hill?
(Show work please)
Answers
The biker's kinetic energy at the bottom of the hill is 210 J.
What is the kinetic energy of the biker?The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.
So, as the biker travels down the hill, her potential energy (PE) transforms into kinetic energy (KE).
At the top of the hill, her PE is 360 J, and she loses 150 J to heat,
so her remaining energy is 360 J - 150 J = 210 J.
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5. A chemist observes that the iron fence outside his home has changed color and texture over time. Which would be a testable scientific question the scientist could ask? (2.5 Points) What will my neighbors think of me if I do not replace the fence? What could I have done to prevent the fence from changing color and texture? Will my friends think the fence is ugly? Which looks better, an iron fence or a wooden fence?
Answers
Answer:
What could have possibly turned the iron fence into a different texture and color. What chemical reaction has taken place in order to change the texture and color of the iron fence? If you live in a wealthy neighborhood, then chances are, they might think it looks lazy. Weather, Rainstorms, and high humidity cause iron fences to rust. You can probably repaint the fence a different color. As long as your friends aren't harsh with you, I don't think they'll think it's ugly. I would prefer a wooden fence and then repaint it from there.
Explanation:
I hope this helps :)
Some reference for Pv cells and switch over or change over
Answers
PV cells are devices that convert sunlight into electricity, enabling the use of solar power. The switch over or change over to PV cells involves transitioning from conventional grid electricity to utilizing solar energy, offering environmental and economic benefits.
Photovoltaic (PV) cells, also known as solar cells, are devices that convert sunlight directly into electricity. They are made of semiconducting materials, such as silicon, that absorb photons from sunlight and release electrons, generating an electric current. PV cells are a key technology in solar power systems, enabling the conversion of solar energy into usable electrical energy.
Switch over or change over, in the context of PV cells, refers to the process of transitioning from using conventional grid electricity to relying on solar power generated by PV cells. This switch can involve installing PV panels on rooftops or in other suitable locations, connecting them to an inverter to convert the DC electricity produced by the PV cells into AC electricity compatible with household or commercial electrical systems.
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8.
A microscopic view of a sheet of paper is shown in the diagram at the
right. Would you expect this sheet of paper to cause light to undergo
regular or diffuse reflection?
Explain.
9.
From what type of surface do you think it would be easier to read?
From pages, which are rough, or from pages which are smooth and
glossy?
Explain your answer.
A microscopic view
of a sheet of paper.
10. Driving at night offers a great example of diffuse vs. regular reflection. A dry road is a diffuse
reflector, while a wet road is not. On the diagrams below, sketch the reflected light off a wet and dry
surface.
Dry Surface
Wet Surface
Why would the wet road appear to the driver to be darker than the dry road?
11. The diagram below contrasts the reflection of light off a smooth surface (left) with the reflection of
light off a rough surface (right). Compare the two diagrams and explain why the reflected rays for a
rough surface do not result in the formation of an image.
Answers
Based on the nature of reflection of light from surfaces, smooth surfaces produce regular reflection while rough surfaces produce diffuse reflection.
What is reflection of light waves?Reflection of light waves refers tobtye bouncing back of light waves when they hit a shiny surface.
Depending on the nature of the surface, reflection of light waves can either be regular if diffuse.
Smooth surfaces produce regular reflection while rough surfaces produce diffuse reflection.
Based on the properties of reflection:
A microscopic view of a sheet of paper shows that the surface is rough, thus it would produce diffuse reflection. Rough pages are easier to read from than smooth and glossy surfaces because they produce diffuse reflection while reading off smooth surface causes a glare due to intense regular reflectionA wet road appears darker because more light passes through and it reflects less light and looks darkerdiffuse reflection do not all pass through the principal focus, thus an image is not formed off a rough surfaceTherefore, it can be concluded that the rough surfaces produce diffuse reflection while smooth and glossy surfaces produce regular reflection.
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a 0.690-kg basketball is dropped out of a window that is 6.75 m above the ground. the ball is caught by a person whose hands are 1.50 m above the ground. (a) how much work is done on the ball by its weight? what is the gravitational potential energy of the basketball, relative to the ground, when it is (b) released and (c) caught? (d) what is the change (pef - pe0) in the ball's gravitational potential energy?
Answers
a) The weight of the ball does 45.2 J of work on it.
b) When the basketball is released, its gravitational potential energy is zero because it is at ground level.
c) When a basketball is caught, its gravitational potential energy relative to the ground is 10.2 J.
d) The change in gravitational potential energy of the ball from release to capture is -37.0 J, indicating a decrease in potential energy.
(a) The work done on the ball by its weight when it is dropped can be calculated as:
W = mgh
where m is the mass of the ball, g is the acceleration due to gravity, and h is the height from which it is dropped. Substituting the given values, we get:
⇒ W = (0.690 kg) * (9.81 m/s^2) * (6.75 m)
⇒ = 45.2 J
Therefore, the work done on the ball by its weight is 45.2 J.
(b) The gravitational potential energy of the basketball relative to the ground when it is released is zero, as it is at ground level.
(c) When the ball is caught by a person whose hands are 1.50 m above the ground, its gravitational potential energy can be calculated as:
⇒ PE = mgh
where m is the mass of the ball, g is the acceleration due to gravity, and h is the height above the ground. Substituting the given values, we get:
⇒ PE = (0.690 kg) * (9.81 m/s^2) * (1.50 m)
⇒ = 10.2 J
Therefore, the gravitational potential energy of the basketball relative to the ground when it is caught is 10.2 J.
(d) The change in the ball's gravitational potential energy from when it is released to when it is caught can be calculated as:
⇒ PE_f - PE_0 = mgh_f - mgh_0
where m is the mass of the ball, g is the acceleration due to gravity, h_f is the final height, and h_0 is the initial height. Substituting the given values, we get:
⇒ PE_f - PE_0 = (0.690 kg) * (9.81 m/s^2) * (1.50 m - 6.75 m)
⇒ = -37.0 J
Therefore, the change in the ball's gravitational potential energy from when it is released to when it is caught is -37.0 J, indicating a decrease in potential energy.
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find the slope of the graph of the equation at the given point. (if an answer is undefined, enter undefined.) xy − 9y2 = 4, (20, 2)
Answers
The slope of the graph of the equation at the point (20, 2) is 1/8.
To find the slope of the graph of the equation at the given point (20, 2), we need to find the derivative of the equation with respect to x and evaluate it at x = 20. Let's differentiate the equation implicitly:
xy - 9y^2 = 4
To differentiate implicitly, we treat y as a function of x and apply the chain rule. Differentiating both sides of the equation with respect to x:
1 * y + x * dy/dx - 9 * 2y * dy/dx = 0
Simplifying this equation:
y + x * dy/dx - 18y * dy/dx = 0
Grouping the terms with dy/dx:
dy/dx * (x - 18y) = -y
Now, let's solve for dy/dx by dividing both sides by (x - 18y):
dy/dx = -y / (x - 18y)
Substituting the given point (20, 2) into the equation:
dy/dx = -2 / (20 - 18(2))
= -2 / (20 - 36)
= -2 / (-16)
= 1/8
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explain the working method of fuse
Answers
Answer:
Electric Fuse is based on the principle of the heating effect of Electric current.
Explanation:
The electric fuse is based on the principle of heating due to electric current. As current flows through the wire, heat is produced. As a result of excessive current flow, heat is generated, melting the Fuse, which normally has a low melting point, preventing any damage to an electric circuit and appliances. (I'm sorry if I'm wrong but I think that's it.)
A graph labeled velocity versus time with horizontal axis time (seconds) and vertical axis velocity (meters per second). A blue line runs straight across at 2 units on the vertical axis for all horizontal axis values.
Based on the graph of velocity over time, which could be the initial velocity and the final velocity for this graph?
initial = 0 m/s; final = 2.5 m/s
initial = 2.5 m/s; final = 2.5 m/s
initial = 3.0 m/s; final = 6.0 m/s
initial = 6.0m/s; final = 3.0 m/s
Answers
Answer:
B
Explanation:
If you dident pay for the no ad thing its okay all u have to do is answer one person's question every day befor you ask a question no ad's just answers you gotta do it every day tho
Answer:
Second option is correct.
The initial and the final velocity for the graph is
initial=2.5m/s; final=2.5m/s.
Explanation:
In given velocity time graph, the line is horizontal and parallel to the x-axis (time-axis).It means the body is moving at the constant velocity.Its acceleration is zero.Explain Velocity-Time graph?The graph plotted between velocity and time, is called velocity time graph.
by it acceleration can be find out.the area of the graph shows distance travelled.it can be plotted in all the quadrants because velocity is a vector quantity.Hence, second option is correct.
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Ahmad drives from his house to his friend's house averaging 60 miles per hour. On the return trip, he averages 50 miles per hour. His total driving time for the round trip is 11 hours. What is the distance, in miles, between Ahmad's house and his friend's house
Answers
Ahmad's average speed on his way to his friend's house is 60 miles per hour, while on the return trip, it is 50 miles per hour. The total time for the round trip is 11 hours.
Let's assume the distance between Ahmad's house and his friend's house is D miles. To find the distance, we can use the formula: Distance = Speed × Time.
On the way to his friend's house, Ahmad travels at an average speed of 60 miles per hour. Let's denote the time taken for this leg of the trip as T1. Using the formula, we have D = 60 × T1.
On the return trip, Ahmad travels at an average speed of 50 miles per hour. The time taken for this leg of the trip can be denoted as T2. Using the formula, we have D = 50 × T2.
According to the problem, the total driving time for the round trip is 11 hours. This can be expressed as T1 + T2 = 11.
Now, we have a system of two equations:
D = 60T1
D = 50T2
T1 + T2 = 11
To solve this system, we can use substitution or elimination. Let's use substitution. From the first equation, we can express T1 in terms of D: T1 = D/60. Substituting this into the third equation, we get D/60 + T2 = 11. Rearranging the equation, we have T2 = 11 - D/60.
Now, substitute the expression for T2 in the second equation: D = 50(11 - D/60).
Simplifying the equation, we have D = 550 - 5D/6.
Multiply both sides by 6 to eliminate the fraction: 6D = 3300 - 5D.
Add 5D to both sides: 11D = 3300.
Divide both sides by 11: D = 300.
Therefore, the distance between Ahmad's house and his friend's house is 300 miles.
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Plsss helppp me I have a lot of questions pls help me I will mark brainliest!!!
Answers
Answer:
kilo means 1000
2a. 0.1
b. 100
c.0.01
d. 0.001
3a.km
b.mL
d.cg
e.mm
g. g
h.kL
Tujuan kita membuat bermacam macam arah dan bentuk garis dalam dalam menggambar adalah
Answers
Answer:
Garis adalah elemen penting seni, didefinisikan sebagai tanda yang menghubungkan ruang antara dua titik, mengambil bentuk apa pun di sepanjang jalan. Garis paling sering digunakan untuk mendefinisikan bentuk dalam karya dua dimensi dan dapat disebut sebagai bentuk pembuatan tanda yang paling kuno, sekaligus paling universal.
Explanation:
semoga membantu
2 A vehicle on a road travels 1800 m in 60 s. Calculate:
the speed of the vehicle in m/s
a
fa
+
Answers
Answer:
Since you know that the initial speed of a
vehicle is 15.0 m/s, and that its ... Isolate d on one side of the equation and solve by ... d=(15.02−10.02)m2 s−2 2⋅2.0m s−2.
A ball of mass .5 kg is dropped from rest from a height of 7 meters. What is its speed just before it hits the ground.
Answers
Answer:
Explanation:
Kinematic equation: Final velocity^2 = Initial velocity^2 + 2*acceleration*displacement
As the ball is dropped from rest, initial velocity = 0.
Acceleration = gravity = 9.8m/s^2
Displacement = 7m
So velocity just before it hits ground
= sqrt( 2*9.8*7)
= 11.71m/s
An object is moving at a speed of 20 m/s and has a kinetic energy of 10,000 J. What is the mass of the object?
Answers
Answer:
m=100kg
Explanation:
E=1/2mv^2
10000=1/2m(20)^2
10000=1/2m(400)
10000=1/2m200
50=1/2m
100=m
Which of the following is an example of thermal energy?
O Lightning
O Food
O Nuclear power
O Melting ice cream
Answers
because thermal energy is obtained via the nuclear fuel.
Answer:
melting ice cream
Explanation:
in order for the ice cream to melt, thermal energy (heat) must be applied to it.
Gravitational force between two objects on earth is 2N. What will be the gravitational force between these two objects on the surface of the earth?
Answers
Answer:
It is dependent on the masses of objects M1, M2, and the distance d between them. The gravitational force between them remains same at 2N. But the gravitational force between each of the objects and the Moon changes and becomes 1/6th of that on the Earth.