Which event demonstrates electromagnetic waves transferring energy?.
Answer:
Radiation is the transfer of heat energy through space by electromagnetic radiation.
Explanation:
are dimensionless quantities always unitless
Important thing is that all unitless quantity is dimensionless quantity. .A dimensionless physical quantity may have an unit
A 400g ball moving toward the east at 3.7m/s suddenly collides head-on with a 200g ball sitting at rest. Determine the velocity of the first ball just after collision
The final velocity of the first ball after the collision is 1.167 m/s to the west.
The given parameters;
mass of the moving ball, m₁ = 400 g = 0.4 kgvelocity of the moving ball, u₁ = 3.7 m/smass of the ball at rest, m₂ = 200 g = 0.2 kgLet the velocity of the first ball after collision = v₁
Let the velocity of the ball at rest after collision = v₂
Apply the principle of conservation of linear momentum;
[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2\\\\0.4(3.7)+ 0.2(0) = 0.4(-v_1) + 0.2v_2\\\\1.48 = -0.4v_1 + 0.2v_2[/tex]
Apply one-directional velocity formula;
[tex]u_1 + v_1 = u_2 + v_2\\\\3.7 - v_1 = 0 + v_2\\\\v_2 = 3.7 -v_1[/tex]
substitute the value of v₂ into the above equation;
[tex]1.48 = -0.4v_1 \ + \ 0.2(3.7 -v_1)\\\\1.48 = -0.4v_1 + 0.74 - 0.2v_1\\\\0.74 = -0.6v_1\\\\v_1 = \frac{-0.74}{0.6} \\\\v_1 = -1.167 \ m/s[/tex]
[tex]v_2 = 3.7 + 1.167\\\\v_2 = 4.867 \ m/s[/tex]
Thus, the final velocity of the first ball after the collision is 1.167 m/s to the west.
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If a ball is thrown from a tall building, how tall is the building if it takes 4s for the ball to land.
Let’s assume that we can ignore the resistance of the air (as one usual does in physics homework).
The distance ‘s’ traveled by an object under constant acceleration ‘a’ in a time ‘t’ is given by
s = 1/2 a t^2
if the object starts at rest. As t=4 seconds and ‘a’ is the usual 9.81 m/s^2, you can put the numbers in and get
s=8*9.81 m ~78.5m or 78 500 cm
A foot amounts to (as you know) 30.3 cm, so you have to divide the above number by the 30.3cm/ft and get
s ~ 257 ft.
Explanation:
A group of students is investigating whether wheels affect the force of friction. The students push two boxes each with the same force on a table. One box has wheels and the
other does not have wheels. The distance traveled by each box is shown.
Experimental Observations
Student 1 Student 2 Student 3 Student 4
Distance traveled by box with wheels
24 cm
22 cm
20 cm
23 cm
Distance traveled by box without wheels
12 cm
14 cm
15 cm
13 cm
Which step should the students take next?
Make a hypothesis
Test another variable
Analyze the results
Share their conclusion
You used a telescope and other mathematics to discover that Jupiter is 5. 20 au from the sun. Use the equation to find its orbital period. Round to the nearest tenth of a year. Jupiter’s Orbit: years.
pls help the image is down below
Answer:3 go to 2 and 4 go to 4 and 1 go 2 2 go to 1
Explanation:
how to find total internal reflection
(c) Total internal reflection occurs
when the incident angle is greater than the critical angle.
n1 sin θ1 = n2 sin θ2. n1 sin θ1 = n2.hope it helpsHighest common factor of 12r and 10
I think the number 2, not sure
What is the mass of the object if it has a density of 657 g/mL and a volume of 32 mL?
Show work!
Answer:
The answer is 21024g/mL
Explanation:
Multiply 657 by 32:
657
× 32
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
21024
↳ 21024 g/mL
Describe what it means to view something from a frame of reference.Give an example to illustrate your explanation.
like just try and try you gut it just trust me I'm a Wuman and you a man
Hunger and thirst are examples of external stimulus true or false
Hunger and thirst are examples of external stimulus true or false
false External stimulus. The external stimulus includes touch and pain, vision, smell, taste, sound, and balance (equilibrium)
The moment the skateboard starts moving (after skateboarder pushes it). Which of Newton's laws is most relevant to this action?
Answer:
The law of gravity
Explanation:
Is the daughter or the science teacher correct? And why?
Answer:
The daughter. I can't really explain but practically, it happens as the daughter has stated.
You receive a generic email notification about an issue with the delivery of a recent order. You’re instructed to click on a link included in the email for further information about the order. When you click, it opens a webpage which asks for your account username and password before you can view the information. Which of the following is the biggest red flag in this scenario?
A. There is an issue while delivering your order.
B. The email you received was a generic notification.
C. The information about the delivery problems is not contained in the email.
D. Your username and password are required to view the information.
Answer: C. The information about the delivery problems is not contained in the email.
Explanation: please give brainliest
PLEASE ANSWER NEED HELP!!!!!!!! PLEASE THE CORRECT ANSWER!!!!!!
The brain itself does not contain nerves. How is it part of the central nervous system?
A.
It sends the signals out to the nerves.
B.
It is not—it is part of the endocrine system.
C.
Only parts of the body that move have nerves.
D.
It is a central part of the body, so it is in that system.
PLEASE NO LINKS OR I WILL REPORT YOU
The brain is part of the central nervous system because it sends the signals out to the nerves.
option A.
What is central nervous system?
The central nervous system is made up of the brain and spinal cord.
The brain controls how we think, learn, move, and feel.
The spinal cord carries messages back and forth between the brain and the nerves that run throughout the body.
Thus, we can conclude that the brain itself does not contain nerves, but it sends the signals out to the nerves hence it is part of the central nervous system.
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The air in a tire pump has a volume of 1.5 L at a temperature of 5 ℃. If the temperature is increased to 25 ℃ and the pressure remains constant, what is the new volume of the tire pump
Answer:
Explanation:
5 C = 278 K
25 C = 298 K
V1 / T1 = V2 / T2
1.5L / 278 K = V2 / 298 K
V2 = (1.5L * 298) / 278
V2 = 1.61 L
A race car traveling at 10 meters per second accelerates at a rate of 1.5 meters per second squared while travelling a distance of 600 meters. The final speed of the race car is approximately
Answer: 44m/s
Explanation:
Refer to the following illustration to answer this question.
Waves
To measure one wavelength, you would measure the distance between __________.
Question 16 options:
D and B
C and A
A and B
C and F
Answer:
C and E
Explanation:
The wavelength of a transverse wave can be measured as the distance between two adjacent crests. The wavelength of a longitudinal wave can be measured as the distance between two adjacent compressions. Short-wavelength waves have more energy than long-wavelength waves of the same amplitude.
NEED HELP!!! ANSWER THESE 5 QUESTIONS FOR 25 POINTS!!!! PLEASE ANSWER!! I WILL GIVE YOU BRAINLIEST
1. Therese plays lacrosse, but she has injured her ankle and has to take a few weeks off. She is finding that she has a lot of trouble sleeping since she is no longer practicing several days a week. What BEST explains this?
A.
She needs regular exercise to move oxygen through the blood.
B.
She clearly requires more exercise than most people to relieve stress.
C.
She is not releasing the endorphins that she used to, and that impacts her sleep.
D.
She is likely not maintaining the healthy habits that she did when she was practicing.
2. Imagine that you are running and want to track your heart rate. What is the easiest way to do this?
A.
Check your pulse at the wrist or neck.
B.
It can’t be done without special equipment.
C.
Close your eyes and count to 30 very slowly.
D.
Take off your shoe and check the top of your foot.
3. Guillermo has decided that he wants to be healthier, so he starts jogging. He has been at it for a week, but he is getting frustrated because he cannot run very far without getting out of breath. He is beginning to think that this is not a good exercise for him since he is not very good at it. What BEST explains why Guillermo is struggling?
A.
He probably does not have good form when he is exercising.
B.
He likely has heart or lung problems that he was not aware of.
C.
He does not have much endurance since he is new to exercise.
D.
He is just not good at jogging and needs to try something else.
4. Li Wei loves cardio and finds it very easy to fit into his schedule. Because he knows it is important to diversify his exercise routine, sometimes he runs and other days he rides his bike. What else should Li Wei consider regarding his routine?
A.
He should add some strength training.
B.
He needs to add one more form of cardio.
C.
He has too much cardio and should cut half of it.
D.
His program works for him, so he should not change it.
5. Jamar has decided that he is going to train for a marathon. He knows that it will take a lot of training, and that he will need to build his muscles. What part of the muscle does he need to build?
A.
oxygen levels
B.
fast twitch fiber
C.
slow twitch fibers
D.
large muscle mass
PLEASE NO LINKS
Answer:
1.A
2.C
3.A
4.B
5.D
Explanation:
CORRECT ME IF IM WRONG
explique o que você da frase:"não somos seres humanos passando por uma experiência espiritual... somos seres espirituais passando por uma experiência humana
Answer:
Talvez o que ele quis dizer é que tudo o que temos não é nosso, mas de Deus, e o que fazemos é saber como será estar vivo
When there is a horizontal wire, the needle of a compass placed beneath the wire comes to rest at right angles to the wire, pointing from left to right. In which direction will the compass needle point if it is held above the wire ? Explain your answer.
Urgent !
Will give the brainliest
Explanation:
Imagine a conducting wire lying on top of the page with a current going from left to right. This current produces a magnetic field of closed field lines concentric around the wire coming out of the page above the wire and going into the page below the wire. When you put your compass above the wire, the needle will align with the magnetic field pointing out of the page, Moving the compass to below the wire the needle will flip 180 degrees and now point into the page. I don’t want to begin the discussion of north and south poles, etc. Just know that the compass needle will turn 180 deg.
transivity, reflexivity, and identity refer to what kind of reasoning?
Deductive reasoning. Deductive reasoning implies the use of a given set of facts or data to deduce other facts, by reasoning logically. It rearranges information that is already known into new statements or truths. Hence transitivity, reflexivity, and identity refer to it and are necessary elements.
What are deductive reasoning and examples?Deductive reasoning is a type of deduction used in science and in life. It is when you take two true statements, or premises, to form a conclusion. For example, A is equal to B. B is also equal to C. Given those two statements, you can conclude A is equal to C using deductive reasoning.
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The temperature decreases 5°C in one hour and then decreases another 3°C in the next hour. Does this fit the definition of weather? Why or why not?
The temperature decreases 5°C in one hour and then decreases another 3°C in the next hour fits the description of weather.
What is Weather?This is defined as the atmospheric condition of a place within a short period of time and is influenced by a lot of factors in the environment.
In this scenario, the temperature was taken every hour which is a short period of time and is thereby denoted as weather.
On the other hand, climate is the condition of a place over a long period of time which is usually up to a year which is why weather fits the definition provided.
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Thea uses a hairdryer to dry her hair. The hairdryer has an efficiency of 0.5 and the total input energy is 180 kJ. How much of the energy supplied is wasted? Give your answer in joules
90kJ of the energy supplied to the hair dryer is wasted.
Efficiency is the ratio of output to input. It is given by:
Efficiency = output / input
Given an efficiency of 0.5 and the total input energy is 180 kJ. Hence:
Efficiency = output / input
0.5 = output / 180 kJ
Output = 90 kJ
Amount of wasted energy = Input - output = 180kJ - 90kJ = 90kJ
Therefore 90kJ of the energy supplied is wasted.
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How does alpha particles transfer energy to their surroundings?
what is the frequency of a wave that has a wavelength of 3m that is traveling at a speed of 9m/s
Answer:
3 m/s
Explanation:
9. A car of 1200 kg is rolling down a hill. When the car reaches a momentum of 7800 kg
m/s, what is its velocity?
Answer:
V = p/m = 7800/1200 = 6.5m/s
Explanation:
HELPPPPPOP
Susan can row a boat at 4.0 m/s in still water. While trying to row
directly across a river from west to east, Susan is pulled by a current
flowing southward at 3.0 m/s. How fast does Susan row relative to the
shore?
The velocity of Susan's boat relative to the offshore when she encountered the water current is 5 m/s.
The given parameters;
Velocity of the Susan's boat in still water, Vb = 4 m/sVelocity of the water current, Vw = 3 m/sThe velocity of Susan's boat relative to the offshore when she encountered the water current is calculated as follows;
[tex]V_{b/o} ^2 = V_b^2 + V_w^2\\\\V_{b/o} = \sqrt{V_b^2 + V_w^2} \\\\\V_{b/o} = \sqrt{4^2 + 3^2}\\\\V_{b/o} = 5 \ m/s[/tex]
Thus, the velocity of Susan's boat relative to the offshore when she encountered the water current is 5 m/s.
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A chemical lab isolates a gaseous element from the atmosphere that does not form chemical compounds. In which group of the periodic table is this element most likely found?
A. 18
B. 17
C. 1
D. 2
Answer:
A- 18
Explanation:
It wont let me explain how
