A glass rod is rubbed briefly with silk and the rod becomes able to attract and lift a number of small pieces of paper. If the rod is rubbed with silk for a longer period of time, explain what will happen and why.
QUICKLY PLEASE!
Answer:
it will have a stronger attraction force
Explanation:
If the rod is rubbed with silk for a longer period of time, then it attract large number of small pieces of paper.
When A glass rod is rubbed briefly with silk, then glass rod is heated because of rod become positively charged. That positively charged glass rod attracts the uncharged pieces of paper because some of the electrons present in the paper accumulate at the end near the rod.Learn more:
https://brainly.com/question/13822373
Which of the following is not true about both scientific laws and scientific theories?
Answer:
In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research
Explanation:
Which of the following statements is true regarding the constructive interference diagram shown below? Select all that apply.
A. The amplitude of the wave is increased.
B. During interference, the wave will produce a louder sound.
C. The amplitude of the wave is decreased.
D. The crests of two waves are overlapping.
E. The troughs of the two waves are overlapping.
There is more than one answer. Help plz
The statement i.e. true with respect to the constructive interference diagram should be that the two waves should be overlapped.
What is the constructive interference?At the time when two waves of the same kind of wavelength should be in phase so they created the new wave along with the amplitude that should be equivalent to the sum of the inidvidual amplitudes so this we called as the constructive interference
As per the given diagram, we can say that the crest for two waves that should be overlapped should be considered.
Learn more about wave here: https://brainly.com/question/22157656
1. body composition the amount of calories the body uses when it's at rest
2. isometric exercises the amount of fat compared to non-fat tissue in the body
3. isotonic exercises resistance training that does not involve movement
4. resting metabolic rate a harmful increase in blood pressure when a person holds his breath during resistance training
5. Valsalva Maneuver resistance training that involves movement
Answer:
1. body composition 1
2. isometric exercises 3
3. isotonic exercises 4
4. resting metabolic rate 2
5. Valsalva Maneuver 5
Explanation:
Look at the vocab definitions
Answer:
1. body composition 3 resistance training that involves movement
2. isometric exercises 5 a harmful increase in blood pressure when a person holds his breath during resistance training
3. isotonic exercises 2 resistance training that does not involve movement
4. resting metabolic rate 1 the amount of fat compared to non-fat tissue in the body
5. Valsalva Maneuver 4 the amount of calories the body uses when it's at rest
Explanation:
vocabs match with the term next to it
Calculate: The net force on a rock with a mass of 2.0kg is 19.6N. What is the acceleration of the rock?
Answer:
the acceleration is 9.8
Explanation: F = mA, 19.6 =2A, A = 9.8 m/s^2
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Read the following information provided from the above link. Answer the following questions.
1. Energy forms are either
gravitational, mechanical, and nuclear.
energy comes in forms that are stored including - chemical,
energy forms are doing work - like electrical, heat, light, motion, and sound.
2. Scientists define energy as
for us
is possible because we have learned how to
and then use it to
3. Energy
along the road and boats through the water. It can bake a cake in the oven, keep ice frozen in the freezer, and
our homes.
4. What are the two basic categories of the seven forms of Energy?
5. Define kinetic energy
6. Define potential energy:
7. Create a T-chart to organize the seven types of energy as potential or kinetic. Give an example of each!
Answer:
for the 1st one its mechanical or nuclear. for the 2nd it is the ability to do work for the 4th one it is Potential energy and Kinetic energy. for the 5th one it is the object has motion or moving. for the 6th question it is when the object is still (not in motion) or is to the opposite of when the object is moving
7 forms of energy ive learned are. medical energy, chemical energy, nuclear energy, heat energy, electrical energy, radiant energy and sound energy.
for the third question the answers are is and even
Explanation:
i just do this in my head and my science notebook, i hope this is wright for you.
also were both in middle school so this might be most of the answers
energy forms are either mechanical or nuclear. nuclear energy comes in forms that ... mechanical ...
tell me if its wrong or anything i just started science or physics like 5-6 months ago
A campfire could be called.
Answer:
a fire at campsite that provides light and warmth.
If two waves interact in destructive interference, which of the following will be true regarding the new wave formed?
A. The new wave will produce a lower-pitched sound than the two original waves.
B. The new wave will produce a quieter sound than the two original waves.
C. The new wave will produce a higher-pitched sound than the two original waves.
D. The new wave will produce a louder sound than the two original waves.
Help plz
Answer:
b
Explanation:
Plz help with these 4
What are the characteristics of bones? (list 7)
What role do joints play?
What are the two types of joints?
What are ligaments?
Answer:
1) The human skeleton performs six major functions: support, movement, protection, production of blood cells, storage of minerals, and endocrine regulation. protection of internal organs
2) Joints are where two bones meet. They make the skeleton flexible — without them, movement would be impossible. Joints allow our bodies to move in many ways.
3)A joint is a point where two or more bones meet. There are three main types of joints; Fibrous (immovable), Cartilaginous (partially moveable) and the Synovial (freely moveable) joint
4)A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
Explanation:
go-gle your welcome ;)
Give THREE examples of objects that have potential energy
A ball kept on 3rd floor of a building.
A pendulum bob kept at 3m height
A stone thrown vertically upward.
A pressed spring.
A squashed spunge ball.
Based on Newton’s 3rd Law of motion, if an archer shoots an arrow at the target, the action force is the bowstring against the arrow. Explain where the reaction force can be found.
Answer:
maybe target, not sure.
Which of the following is an example of a valid experiment?Adding Minutes to different types of soda and recording/comparing the reaction height.Asking your friends what kind of candy they like and recording the responses.Building a baking soda volcano
Asking your friends what kind of candy they like and recording the responses.
recording answers are a valid experiment. but at the same time adding minutes to different types of soda and recording is another great idea.
Statement A is correct. Adding Minutes to different types of soda and recording/comparing the reaction height is an example of a valid experiment.
What is an experiment?An experiment is a technique used to prove or disprove a theory, or to test the efficacy or probability of something that has never been done before.
Experiments reveal cause-and-effect relationships by illustrating what happens when a specific component is changed. Experiments have a wide range of goals and scales,
but they always rely on a repeatable technique and rational interpretation of the outcomes. Natural experimental research is also available.
Adding Minutes to different types of soda and recording/comparing the reaction height is an example of a valid experiment.
Hence statement A is correct.
To learn more about the experiment refer to the link;
https://brainly.com/question/9199868
Can you help me? Thanks! 10+ points!
Explanation:
velocity: average velocity equals Displacement /change in time.
Kinetic energy: K=1/2mv^2 (m = Mass) ( v = Velocity).
speed using the kinetic energy is also KE =1/2mv^2
(M in Kg) (V in m/s)
Based on Newton’s 3rd Law of motion, if a baseball player hits a ball with the bat, the action force is the impact of the bat against the ball. Explain where the reaction force can be found.
Answer:
the reaction force will be found where the bat hits the ball.
Explanation:
Answer:
reaction force will be found where the bat hits the ball
Explanation:
question 1: what happens if our eyes are not focused on your target?
question 2: using what you know about basketball, why is passing often more efficient than dribbling the basketball
Answer:
You can get hit or miss your shot
it makes it harder for the other person to get the ball
Explanation:
The picture below shows an experiment to find out the highest frequencies which students can hear. When the teacher turns the dial the frequency from the loudspeaker increases. the students put their hands down when they can no longer hear the sound.
Some students put their hands up while others have put their hands down. What conclusion can you draw from this observation?
The teacher suspects that some of the students are not giving honest responses, they are keeping their hands up even when they can no longer hear the sound. How could he check if he is right? *
If an object is travelling faster than its own sound waves, which of the following is created?
A. wave destruction
B. pressure cooker
C. velocity pulse
D. sonic boom
Help plz
Answer:
D
Explanation:
When an object travels faster than the speed of sound, a sonic boom is created. A ring of pressure waves (probably why wave destruction and pressure cooker are options lol) are created, which is why when you see a jet make a sonic boom there looks like a ring shaped cloud behind it. Hope this helps! For further confirmation/information, just look up sonic boom science (or else you will get sonic boom the video game)
Use the graph to determine the velocity between 6 and 12 seconds.
-2
m/s
What was the velocity over the entire trip?
m/s Also can someone explain how you got the answers?.
I'd like some help in these two questions please, thankyou so much. have a great day! stay safe and stay happy. (there are two parts of one question so uh yea.
Answer:
The resultant force is 25 N in the negative x-direction.
Explanation:
We need to find the total force in the x and y-direction and then the resultant force will be the magnitude of the sum of Fx and Fy.
Total force in the x-direction:
[tex]F_{x}=12-37=-25\: N[/tex]
Total force in the y-direction:
[tex]F_{y}=10-10=0\: N[/tex]
Therefore, the magnitude of the resultant force will be:
[tex]F_{R}=\sqrt{F_{x}^{2}+F_{y}^{2}}[/tex]
[tex]F_{R}=\sqrt{(-25)^{2}+0}[/tex]
[tex]|F_{R}|=25\: N[/tex]
The resultant force is 25 N in the negative x-direction, in other words, the car will move to the left.
I hope it helps you!
A simple machine increases __________ to more efficiently use force to do work.
Distance / Displacement
Power
Force
Energy
Please explain your answer.
The gravity of Earth is attracting a person towards the center with 500N of gravitational force. The person is exerting a reactionary force on the Earth with how much force? Explain your thinking behind this.
Answer:
I don't know.
Explanation:
Two girls are pulling on opposite ends of a thick rope. Both girls are pulling
on the rope with the same force but in opposite directions. If both girls
continue to pull with the same force, what will MOST likely happen? *
a. One girl will pull the other toward her
b. Both girls will stay in the same place
c. Gravity will cause the rope to sag
d. The rope will break
Answer:
B
Explanation:
It the same amount of force is being used it will cancel each other out.
Based on Newton’s 3rd Law of motion, if an archer shoots an arrow at the target, the action force is the bowstring against the arrow. Explain where the reaction force can be found.
Answer:
the reaction force is the arrows push against the bow sting
Explanation:
the two objects must react the same , bowstring and arrow.
Answer:
the reaction force is the arrows push against the bow sting
the two objects must react the same , bowstring and arrow.
Scientists have sent an unmanned space vehicle to Mars to investigate the properties of the planet. Mars' gravitational field is 38% the strength of Earth's gravitational field. How will the weight and mass of the vehicle change on Mars?
A) The mass will increase, the weight will increase
B) The mass will decrease, the weight will decrease
C) The mass will remain the same, the weight will decrease
D) The mass will increase, the weight will remain the same
which is the stronger acid?
A pH 1
B pH 4
C pH 8
D pH 13
An auto company technician is trying to relate a car’s damage in a crash test to the kinetic energy of the car on impact. In addition to the mass of the car, what ratio will the technician need in order to determine to complete his study? The ratio of time to speed, weight to mass, distance to time, or acceleration to speed. Explain why.
Answer:
????????????????
Explanation:
????????
As human activities constantly change the ecosystem, scientists work to find ways to keep ecosystems healthy and intact. In what ways do humans protect and restore the ecosystem? Choose the three that apply.
A.
by providing cultural services
B.
through ecological restoration
C.
by maintaining current conditions
D.
through conservation
E.
by working toward sustainability to maintain diversity
In what ways do humans protect and restore the ecosystem? Choose the three that apply.
B. through ecological restoration
D. through conservation
E. by working toward sustainability to maintain diversity.
An model leans off a bridge railing to take a picture and accidentally drops their phone. The phone's mass is 0.115 kg and the bridge is 15 m tall. The instant the model dropped the phone, it's mechanical energy is 16.9 joules? why?
Answer:
The statement is true:
Explanation:
As said in the statement, we need to measure the mechanical energy(M.E) of the phone at the instant is dropped:
M.E = P.E + K.E
Given the fall hasn't yet begun, the kinetic energy (K.E) is equal to zero so M.E = P.E
We must use the Potential Energy formula :
P.E = h x m x g
We know that g is equal to 9.8 [tex]J.kg^{-1} .m^{-1}[/tex] on Earth, the height is 15m and m is 0.115:
M.E = 15 x 0.115 x 9.8 = 16.9 Joules
Energy can't be created or destroyed - Law of Conservation of Energy.
If this is true, where does the mechanical energy go when skateboarding? Eventually the skateboarder will slow down and stop if she doesn't add more mechanical energy by pushing. Choose the most correct statement below.
Energy isn't conserved and actually gets used up.
Mechanical Energy converts into potential energy and then she stops.
Mechanical Energy gets converted into thermal energy through friction.
explain your answer
Answer: Mechanical Energy gets converted into thermal energy through friction
Explanation: when the skateboard is rubbing against whatever it’s rolling on it creates friction which slows down the skateboard, the mechanical energy is then converted into thermal energy. If you’ve ever touched the bottom of a wheel after going fast it typically feels a little warm.
Hope this helped
Describe how noise-cancelling headphones modify the sound waves around the user. Your answer should be three to four sentences in length and contain proper grammar and punctuation.
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