Answer:
The weight of the person decreases.
Explanation:
Weight of person at sea level = 700 N
height = 10000m
We know that the weight is given by product of mass and the acceleration due to gravity.
The acceleration due to gravity at height is given by
[tex]g' =g\times \left ( \frac{R}{R+h} \right )^2[/tex]
Where, R is the radius of earth and h is the height.
Now, as we go on heights , the acceleration due to gravity decreases, so the weight also decreases as we go on heights.
5. A wire, resistance 23.6 carries a current. 5.9 A. What is the
potential difference across the wire?
a. V = 139 V
c. V=4V
b. V = 17.7 V
d. V = 0.25 V
Answer:
d
Explanation:
Answer:
B
Explanation:
The length of an aluminium rod is 1m and the speed of sound along the rod is 5000 m per second .Find the values of f1 ad f2
Answer:
i. 2.5 kHz ii. 5 kHz
Explanation:
The frequency of the wave in the rod is given by f = nv/2L where n = harmonic, v = speed of sound in rod = 5000 m/s and L = length of rod = 1 m
i. f1
For f1, n = 1
f1 = 1 × v/2L
= v/2L
Substituting the values of the variables into the equation, we have
= 5000 m/s ÷ (2 × 1 m)
= 5000 m/s ÷ 2 m
= 2500 /s
= 2500 Hz
= 2.5 kHz
ii. f2
For f2, n = 2
f2 = 2 × v/2L
= v/L
Substituting the values of the variables into the equation, we have
= 5000 m/s ÷ 1 m
= 5000 /s
= 5000 Hz
= 5 kHz
A sphere of diameter 3.0cm is mounted into a thin uniform wire of diameter 0.2mm calculate the length of the wire in meters
Answer:
Length of the wire in meters = 0.000628 meter (Approx.)
Explanation:
Given:
Diameter of wire = 0.2 mm
Find:
Length of the wire in meters
Computation:
Radius of wire = 0.2 / 2
Radius of wire = 0.1
Length of the wire = Circumference of circle
Circumference of circle = 2πr
Length of the wire = 2πr
Length of the wire = 2(3.14)(0.1)
Length of the wire = 0.628 mm (Approx.)
1 meter = 1,000 mm
So,
Length of the wire in meters = 0.000628 meter (Approx.)
A hockey player uses a hockey stick to hit a puck such that the stick provides an applied force on the puck The puck travels for distance of 0.85 m while experiencing the force from the stick
The puck leaves the stick with a speed of 8.0 m/s and travels at constant speed in a straight line along the horizontalice for a distance of 12 m. The frictional force between the puck and the ice
surface is negligible
Which of the following statements best describes the force or forces exerted on the puck after it is hit by the stick and slides on the ice?
(A) The applied force from the stick is still exerted on the puck during this time.
Since the puck's acceleration is zero, there are no forces exerted on the puck during this time.
Since there is no frictional force exerted on the puck, a normal force is not exerted on the puck, but the gravitational force is exerted on the puck
There is no frictional force exerted on the puck and the gravitational force and normal force are exerted on the puck and are equal in magnitude
Answer:
Explanation:
Let's analyze the situation presented in order to know which answer is correct.
When the stick collides with the puck, it exerts a force for a certain time and discants. / After this time the horizontal force decreases to zero and the disk continues to move by the action of the initial velocity on the x axis and the acceleration of gravity on the y axis.
Therefore, after the collision, the only force that acts on the disk is the gravitational attractive force (WEIGHT), directed on the axis and in a negative direction.
The correct answer is:
C) Since there is no frictional force exerted on the puck, a normal force is not exerted on the puck, but the gravitational force is exerted on the puck
A student is building an electric circuit.Which material should she choose for the wires,and why?
If i understand your question clearly, The best choice in most scenarios is copper.
Why?
Its due to copper's high conductive properties, its abundance, its low price compared to its fellow metal conductors, its ductile property, thermal resistance and immunity to oxidation ( rusting ).
Though Silver surpasses copper in conductivity, copper is shown to be more notable than its fellow conductors.
what happen when I put a coloured ice cube in warm water
Answer:
it would melt with the hot weather
Explanation:
It melts and the water changes color
Una persona pesa 700 N al nivel del mar. ¿Cuándo sube a un avión a 10000 m de altura pesará más, igual o menos?
Answer:
La persona pesa menos
Explanation:
Generalmente, definimos el peso como la fuerza gravitacional que actúa sobre un objeto.
Dado que la constante gravitacional depende del cuadrado de la distancia medida desde el centro de la Tierra, podemos concluir que el peso de un objeto disminuye a medida que aumenta la distancia entre el objeto y el centro de la Tierra (mayor altitud).
Por lo tanto, la persona que pesa 700 N al nivel del mar pesará menos cuando esté en un avión a una altitud de 10,000 m.
Why does the output of a microphone increase as the frequency of the sound waves which it receives increases
Answer:
See Explanation
Explanation:
The frequency of sound waves received by the microphone influences the output or pitch of the sound obtained from the microphone.
The higher the frequency of the sound received by the microphone, the higher the output of the microphone and vice versa. This is because, the higher the frequency of sound, the higher the oscillations produced and the greater the output of the microphone.
The rise and fall in the pitch of sound waves as the frequency of sound waves varies is called inflection.
Answer:
b
Explanation:
cuz im smart
The diagram represents Earth in its orbit around the Sun and the Moon (M) in different positions in its orbit around Earth. Letters A through D represent four positions of Earth in its orbit. Earth is closest to the Sun near position D and farthest from the Sun near position B. Identify the lettered position of Earth and the Moon when this full moon phase can be observed, and state the name of the eclipse that could occur at this position.
Answer:
Option (D), lunar eclipse
Explanation:
When the moon comes between the earth and sun, the lunar eclipse occurs, so D is the lunar eclipse. It is full moon day.
C is the position when there is new moon day and it is solar eclipse.
So, option (D) is correct.
pls help me solve this
Answer:
a) The uniform velocity travelled by the car is 10 meters per second.
(Point b has been erased by the user)
c) The distance travelled by the car with uniform velocity is 100 meters.
Explanation:
a) Calculate the uniform velocity travelled by the car:
The uniform velocity is the final velocity ([tex]v[/tex]), in meters per second, of the the uniform accelerated stage:
[tex]v = v_{o} + a\cdot t[/tex] (1)
Where:
[tex]v_{o}[/tex] - Initial velocity, in meters per second.
[tex]a[/tex] - Acceleration, in meters per square second.
[tex]t[/tex] - Time, in seconds.
If we know that [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]a = 2\,\frac{m}{s^{2}}[/tex] and [tex]t = 5\,s[/tex], then the uniform velocity is:
[tex]v = 0\,\frac{m}{s} + \left(2\,\frac{m}{s^{2}} \right)\cdot (5\,s)[/tex]
[tex]v = 10\,\frac{m}{s}[/tex]
The uniform velocity travelled by the car is 10 meters per second.
(Point b has been erased by the user)
c) The distance travelled by the car ([tex]\Delta x[/tex]), in meters, with uniform velocity is calculated by the following kinematic expression:
[tex]\Delta x = v\cdot t[/tex] (2)
If we know that [tex]v = 10\,\frac{m}{s}[/tex] and [tex]t = 10\,s[/tex], then the distance travelled is:
[tex]\Delta x = \left(10\,\frac{m}{s} \right)\cdot (10\,s)[/tex]
[tex]\Delta x = 100\,m[/tex]
The distance travelled by the car with uniform velocity is 100 meters.
Can someone please help with part c)
Energy released ,
[tex] = 3.789 \times {10}^{ - 12} [/tex] J
A ball is kicked off of a roof at 23 m/s [R 25° U]. What is the height of
the building if it lands 2.8 s later?
Answer:
Explanation:
Considering the fact that we ave been given an angle of inclination here, we best use it! That means that the velocity of 23 m/s is actually NOT the velocity we need; I tell my students that it is a "blanket" velocity but is not accurate in either the x or the y dimension of parabolic motion. In order to find the actual velocity in the dimension in which we are working, which is the y-dimension, we use the formula:
[tex]v_{0y}=v_0sin\theta[/tex] and filling in:
[tex]v_{0y}=23sin(25)[/tex] which gives us an upwards velocity of 9.7 m/s. So here's what we have to work with in its entirety:
[tex]v_{0y}=9.7m/s[/tex]
a = -9.8 m/s/s
t = 2.8 seconds
Δx = ?? m
The one-dimensional motion equation that utilizes all of these variables is
Δx = [tex]v_0t+\frac{1}{2}at^2[/tex] and filling in:
Δx = [tex]9.7(2.8)+\frac{1}{2}(-9.8)(2.8)^2[/tex] I am going to do the math according to the correct rules of significant digits, so to the left of the + sign and to 2 sig fig, we have
Δx = 27 + [tex]\frac{1}{2}(-9.8)(2.8)^2[/tex] and then to the right of the + sign and to 2 significant digits we have
Δx = 27 - 38 so
Δx = -11 meters. Now, we all know that distance is not a negative value, but what this negative number tells us is that the ball fell 11 meters BELOW the point from which it was kicked, which is the same thing as being kicked from a building that is 11 meters high.
Multiplying a vector with another vector results in what type of answer.
A) a direction
B) a vector
C) either a vector or a scalar
D) a scalar
multiplication of two vectors yields a vector oroduy
Alexis is a scientist who is studying solid-state physics. Which activity would she most likely do as a part of this research? O identifying the optimal vessel for containing carbon dioxide O studying the atomic structure of solid carbon dioxide O determining the effect of pressure on the volume of carbon dioxide O observing the natural state of carbon dioxide
Answer:
pretty sure its studying the atomic structure of a solid carbon dioxide. so c
Explanation:
Answer:
B. Studying the atomic structure of solid carbon dioxide
Explanation:
This is known as crystallography, the study of the arrangement of atoms in a solid, and it is a popular branch of solid-state physics.
Hope this helps :)
6.05 Infections and Health
Plese don't report me i am trying to get the assigment done
Introduction
Contaminated water is a health risk, and not all populations have access to clean water. You are going to use household items to design, test and revise a water filtration system. New technologies undergo testing and revision before they are released to the public. This lab will simulate how the scientific process is used to solve problems.
Purpose
The Purpose of your design is to filter dirt, sand and other sediment from “swamp” water. You do not need to make it drinkable during this design. You will begin with a water sample that has visible dirt, mud or other contaminants. You will design a way to filter the water and evaluate your design. You will not be able to test for microorganisms or to filter them out during this design process. Do not test the water by drinking it.
Important: Do NOT drink the water in your experiment.
Materials
“Swamp” water (You can get this from an outside source like a hole in the ground, puddle, lake, river or swamp. Or, you may add dirt and sediment to tap water.) The starting sample should have visible dirt or sediment.
You may use any household materials for your water filtration system. Here are some suggestions:
Cheesecloth
OId t-shirt
Coffee filters
Pantyhose
Cotton balls
Sock
Funnel
Water bottle
Data for Design One (6 points)
Describe the appearance and smell of the “swamp” water before and after filtration. Use complete sentences and detailed examples.
Skilled Scientist level from Rubric: Student gives thorough details about the appearance and smell of the water before and after the filtration for Design One and Design Two.
Water before filtration
Water after filtration
Description of appearance
Description of smell or other physical characteristics
Rate the visible cleanliness of the water on a scale of 1 to 10 with 10 being the cleanest.
Feedback ( 5 points)
Consulat a peer or a family member about ways your design could be improved. Describe the feedback and provide the name of the reviewer. These are only suggestions that you can use to plan for Design Two. Use complete sentences and detailed examples.
Skilled Scientist level from Rubric: Student thoroughly describes the feedback received from peer/family member, and it is clear a meaningful exchange about ways to improve the design took place.
List the name of peer/family member and relationship:
Describe the feedback given by your peer/family member. What changes do they suggest you make to your design in order to clean the water better?
Planning for DesignTwo (8 points)
Use this space to plan out how to improve your water filter. Based on the feedback you received, what part are you trying to improve? Why did you make the changes that you did? Use complete sentences and detailed examples. You may include sketches or diagrams.
Skilled Scientist level from Rubric: Student thoroughly explains the changes for the design and gives ample details about any improvements that were made.
List materials used:
Describe how Design Two will work:
What part of your design are you trying to improve?
Why did you make the changes you did?
Data for Design Two (6 points)
Use the data and feedback from your first design to make changes to your water filtration system. Test your new design. Record the appearance and smell of the “swamp” water before and after filtration. Use complete sentences and detailed examples.
Skilled Scientist level from Rubric: Student gives thorough details about the appearance and smell of the water before and after the filtration for Design One and Design Two.
Water before filtration
Water after filtration
Description of appearance
Description of smell or other physical characteristics
Rate the visible cleanliness of the water on a scale of 1 to 10 with 10 being the cleanest.
Conclusion (10 points)
Use your data from Design One and Design Two to answer the following questions. Use complete sentences and detailed examples.
Skilled Scientist level from Rubric: Student answers all questions using ample details and showing critical thinking skills to reflect on the design process.
Summarize the appearance and smell of the “swamp” water before and after the filtering process using Design One.
2. Describe the changes you made to your water filtration system.
3. What feedback helped you make changes to your water filtration system?
4. Summarize the appearance and smell of the “swamp” water before and after the filtering process using Design Two.
5. What did you learn about the process of planning, testing and revising a design?
The process of filtration of swamp water using a filtering material such as neat clothes will make the water clearer and remove any bad smell.
What is filtration?Filtration is a separation technique used to separate insoluble solids from a liquid.
Filtration is employed in water purification.
Water purification is done in water purification plants.
A locally designed purification process for swamp water will involve using materials such as:
A T-shirt Funnel Water bottleThe T-shirt is used filter out mud and sediments.
Repeated filtrations will make the water clearer and remove any bad smell.
Learn more about filtration at: https://brainly.com/question/552187
What are the three types of levers? Give examples of each?
Class 1 has the fulcrum placed between the effort and load. Class 2 has the load between the effort and the fulcrum. Class 3 has the effort between the load and the fulcrum.
...
Examples
Tweezers.
Stapler.
Mousetrap.
Broom.
Hockey stick.
There are 8000 turns on the primary coil and 200 turns on the secondary coil of the transformer. The primary coil is connectd to a 240 v mains supply, suggest whether this transformer is a step up or step down transformer
Answer: Step down
Explanation:
Given
No of turns on the primary coil is [tex]N_p=8000[/tex]
No of turns on the secondary coil is [tex]N_s=200[/tex]
Primary is connected to the voltage [tex]V_p=240\ V[/tex]
According to the turns rule
[tex]\Rightarrow \dfrac{N_p}{N_s}=\dfrac{V_p}{V_s}\\\\\Rightarrow \dfrac{8000}{200}=\dfrac{240}{V_s}\\\\\Rightarrow V_s=\dfrac{240}{40}\\\\\Rightarrow V_s=6\ V[/tex]
As the voltage drops from 240 V to 6 V. Therefore it is a step-down transformer.
A pendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 2.1 m. The maximum angle the string makes with the vertical as the pendulum swings is 30°. What is the speed of the object at the lowest point in its trajectory?
Answer:
The speed of the object at the lowest point in its trajectory is:
[tex]v=2.34\: m/s[/tex]
Explanation:
We can use the conservation of energy between the maximum point of swing and the lowest point of the pendulum.
[tex]P=K[/tex]
[tex]mgh=\frac{1}{2}mv^{2}[/tex] (1)
Where:
h is the height of the object at 30° with the vertical.v is the speed at the lowest point.We can find h using trigonometry.
[tex]h=L-Lcos(30)=L(1-cos(30))[/tex]
[tex]h=2.1(1-cos(30))=0.28\: m[/tex]
Now, using equation (1) we can find v.
[tex]gh=\frac{1}{2}v^{2}[/tex]
[tex]2gh=v^{2}[/tex]
[tex]v=\sqrt{2gh}[/tex]
[tex]v=\sqrt{2(9.81)(0.28)}[/tex]
[tex]v=2.34\: m/s[/tex]
I hope it helps you!
Which variable is represented by the following symbol? ∑F
a. Normal Force
b. Applied Force
c. Weight
d. Net Force
Answer:
d.Net force
Explanation:
The net force is the force which is the sum of all the forces acting on an object simultaneously.
Earth's atmosphere _____. is made mostly of oxygen and carbon dioxide protects the surface from meteoroids and comets reflects most of the sun's heat and light back into space is very thin compared to the moon's atmosphere
Answer:
protects the surface from meteoroids and comets
Explanation:
Have a nice day
protects the surface from meteoroids and comets
what is the name of part of the iss which provides it with electricity
1d. Conservation of energy is demonstrated in this roller coaster example.
The Conservation of Energy is a principle which states that energy cannot be created
or destroyed, but can be altered from one form to another
Friction plays a significant role in the efficiency of the rollercoaster cars. Explain how, even
with friction, the law of conservation of energy still holds true. (2 points)
Answer:
According to the principle of the Conservation of Energy, energy can neither be destroyed or created, energy can be transformed from form to another
The forms of energy the car has at the different stages is given by virtue of either the position of the car, which is the car's potential energy, or the speed of the car, which gives the potential energy of the car
However, due to the frictional forces acting on the car, there is a frictional force which requires work to be done for the car to move between points in the roller coaster
Therefore, based on the Conservation of Energy principle, we have;
The total energy of the roller coaster, M.E. = m·g·[tex]h_{max}[/tex]
Where;
m = The mass of the roller coaster = 4,500 kg
g = The acceleration due to gravity ≈ 9.81 m/s²
[tex]h_{max}[/tex] = The maximum height = 30 m
Therefore, M.E.[tex]_A[/tex] = 4,500 × 9.81 × 30 = 1,324,350 J
The energy at point B, [tex]M.E._B[/tex] = 4,500×15×9.81 + (1/2) ×4,500×17.15² = 1,323,950.625
The energy at point B, [tex]M.E._B[/tex] = 1,323,950.625 J
At point C, the total energy, [tex]M.E._C[/tex] = (1/2)·m·v²
Where;
v = The velocity of the roller coaster at point c = 24.25 m/s
Therefore;
[tex]M.E._C[/tex] = (1/2) × 4,500 × 24.25² = 1,323,140.625
At point C, the total energy, [tex]M.E._C[/tex] = 1,323,140.625 J
Therefore, given that the energy at point A, M.E.[tex]_A[/tex] is larger than the energy at point B, [tex]M.E._B[/tex], is larger than the energy at point C, [tex]M.E._C[/tex], the loss in energy can be explained by the presence of the friction which require energy for movement of the roller coaster between the points
Explanation:
Amelia is doing an experiment in which she is
going to burn various solid chemicals to see the
colors of flames they produce. For this laboratory
experiment, what types of safety precautions
should she take?
tie hair back
leave open flame unattended to get a drink
only burn the amount of chemicals as
directed by the lab procedure
put out the flame with water from the eyewash
station
Answer:
tie hair back
only burn the amount of chemicals as
directed by the lab procedure
Explanation:
The correct safety precautions for Amelia to take from the options would be to tie her hair back and to only burn the amount of chemicals recommended by the lab procedure.
With her hair left flowing freely, Amelia runs the risk of the hair catching flame while trying to burn the chemicals according to the procedure. Hence, tying her hair up into one neat bunch will limit the risk of it catching fire while working in the lab.
Also, burning less or more than the amount of chemicals recommended by the procedure may be dangerous or hinder Amelia from getting the right result.
Answer:
1,3
Explanation:
just did it
uses of semiconductor
Answer:
Many digital consumer products in everyday life such as mobile phones / smartphones, digital cameras, televisions, washing machines, refrigerators and LED bulbs also use semiconductors.
Which best describes the electric field created by a positive charge?
A. It circles clockwise around the charge.
B. It circles counterclockwise around the charge.
C. Its rays point away from the charge.
D. Its rays point toward the charge.
Answer:
Which best describes the electric field created by a positive charge? ... Its rays point toward the charge.
Explanation:
thank me later
What's the meaning of longitudinal?
Answer:
A longitudinal study is a research design that involves repeated observations of the same variables over short or long periods of time. It is often a type of observational study, although they can also be structured as longitudinal randomized experiments.
Explanation:
Why don't normal everyday collisions result in fusion?
a ball of mass 0.2 kg is dropped from a height of 20m on impact to the ground it loses in 30 joule of energy calculate the height it reaches on rebound
Answer:
5 m
Explanation:
We'll begin by calculating the original potential energy. This can be obtained as follow:
Mass (m) = 0.2 Kg
Height (h) = 20 m
Acceleration due to gravity (g) = 10 m/s²
Energy (E₀) =?
E₀ = mgh
E₀ = 0.2 × 10 × 20
E₀ = 40 J
Next, we shall determine the new energy of the ball.
Energy (E₀) = 40 J
Energy lost (Eₗ) = 30 J
New energy (E) =?
E = E₀ – Eₗ
E = 40 – 30
E = 10 J
Finally, we shall determine height of the ball on rebound. This can be obtained as follow:
New energy (E) = 10 J
Mass (m) = 0.2 Kg
Acceleration due to gravity (g) = 10 m/s²
Height (h) =?
E = mgh
10 = 0.2 × 10 × h
10 = 2 × h
Divide both side by 2
h= 10 / 2
h = 5 m
Thus, the height of the ball on rebound is 5 m
Dùng một gương phẳng G để hắt 1 chùm ánh sáng mặt trời hẹp xuống đáy một cái giếng cạn hình trụ thẳng đứng dọc theo trục của giếng. Tính góc hợp bởi mặt gương và đường thẳng đứng, biết rằng các tia sáng mặt trời nghiêng với mặt phẳng nằm ngang một góc 60°C
definition of net force
Answer:
Net force is the vector sum of forces acting on a particle or body. The net force is a single force that replaces the effect of the original forces on the particle's motion. It gives the particle the same acceleration as all those actual forces together as described by Newton's second law of motion.
Explanation:
use this, but put it into you own words.
Answer:
The vector sum of forces acting on a particle or body is referred to as net force. The net force is a single force that replaces the effect of the original forces on the motion of the particle. It provides the particle with the same acceleration as all of the actual forces combined, as described by Newton's second law of motion.
°•°•°•°•°•°•°•°•°•°•°•°•°•°•°•°•
Hope it helps
Have a great day!!