Answer:
I am really sorry but I can't understand the question.
Can you translate the question to English?
Explanation:
The Sankey diagrams below show the energy transfers in two light bulbs. What is the efficiency of light bulb 2? Give your answer to the nearest 0.5 percent
Answer:
Divide the useful energy by the total energy and you will get the efficiency which should be between 0 and 1. Multiply by 100 to find the percentage efficiency.
Explanation:
NEED HELP!!! ANSWER THESE 5 QUESTIONS FOR 25 POINTS!!!! PLEASE ANSWER!! I WILL GIVE YOU BRAINEST
1. Jerome explains to his doctor that because he spends a lot of time at his desk, he makes sure that his chair supports good posture. But when he is home, he spends his time on an old, squishy couch that offers very little support. He figures that since he spends most of his time at work, he does not need to worry about his home furniture as much. How would Jerome’s doctor MOST likely reply?
A.
Jerome’s thinking is correct since he spends most of his time at work.
B.
Jerome should bring his chair from work home with him on the weekend.
C.
If Jerome’s standing posture is good, he does not have to worry about his seated posture.
D.
Sitting properly is important in all contexts, so Jerome should consider his seating at home.
2. 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.
3. Which is the BEST example of the kind of mechanics that are studied in sports biometrics?
A.
the average attendance at a sporting event
B.
how a new sport becomes popular in a community
C.
the movement of the wrist when hitting a tennis ball
D.
the median height of the most successful hockey goalies
4. Ewan had a resting heart rate of about 110. What does this indicate?
A.
His heart rate is perfectly average.
B.
He probably has a high metabolism.
C.
He needs to work on raising his resting heart rate.
D.
His heart rate is high and could indicate a problem.
5. Why is acceptance an important part of building a healthy lifestyle?
A.
Exercise will probably not change much in your life.
B.
Healthy lifestyles often create a lot of disappointment.
C.
If you understand your limitations, you are less likely to be frustrated.
D.
Finding the energy to exercise can be hard, so you should limit your goals.
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An athlete spins in a circle and throws a 1.6-kg discus. The radius of the discus's path is 1.0 m, and he releases it with an angular speed of 15.0 rad/s. The athlete spins for a total of 1.2 s before releasing the discus.
– What is the tangential speed of the discus at release?
– What is the centripetal acceleration of the discus?
– What is the centripetal force on the discus?
giving Brainliest for full and proper answers! thank you for anyone who tries to help/explain :)
(a) The tangential speed of the discus at the release is 15 m/s.
(b) The centripetal acceleration of the discus is 225 m/s².
(c) The centripetal force on the discus is 360 N.
The given parameters;
mass of the discus, m = 1.6 kgradius of the path, r = 1 mangular speed, ω = 15 rad/stime of motion, t = 1.2 sThe tangential speed of the discus at the release is calculated as follows;
[tex]v = \omega r\\\\v = 15 \ rad/s \ \times 1 \ m\\\\v = 15 \ m/s[/tex]
The centripetal acceleration of the discus is calculated as follows;
[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{15^2}{1} \\\\a _c = 225 \ m/s^2[/tex]
The centripetal force on the discus is calculated as follows;
[tex]F_c = ma_c\\\\F_c = 1.6 \times 225\\\\F_c = 360 \ N[/tex]
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why does an elliptical galaxy look like one giant star
Explanation: An Elliptical galaxy looks like one giant star because the stars in the elliptical galaxy are often close together, making the center seem to be one giant star.
Hope this helps
Are these pictures below an example of reflection or refraction?
Answer:
Refraction
Explanation:
Reflection involves a change in direction of waves when they bounce off a barrier.
Refraction of waves involves a change in the direction of waves as they pass from one medium to another.
Please mark as brainliest if this helps! :)
A plane is flying through the sky at a constant speed. The thrust of the aeroplane (making it go forwards) is 100N. Air resistance is also acting on the plane. What must the resultant (overall) force be on the plane?
A: 0N
B: 50N
C: 100N
D: 150N
Answer: 0N
Explanation: Hope this helps :)
last time i wrote the wrong answer for the wrong problem :)
For the constant speed, the resultant force on the plane is 0N. So, the correct option is A.
What is Force?A force is defined as the parameter that can change the momentum of an object that can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or pull where force has both magnitude and direction, making it a vector quantity.
For above given information, the plane is moving at a constant speed. According to Newton's first law, the net external force on the aircraft due to the thrust generated by the propeller must be zero and air resistance is equal and in opposite directions to produce zero net force.
Thus, for the constant speed, the resultant force on the plane is 0N. So, the correct option is A.
Learn more about Force, here:
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How are particles in liquids, solids, and gases the same? How are they different?
Answer:
Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
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How do you find out the missing masses in a balloon
Answer:
How do you find out the missing masses in a balloon?
Well, actually you can't find the missing masses in a balloon. Why?
Because the mass of the mass of balloon, it can't see the mass of it, it only see if it the balloon is deflated or inflated.
Explanation:
Hope it helps
#LetsStudy
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
Could someone please help me
Answer:
the size of the shadow will be smaller due to smaller hands
Highest common factor of 12r and 10
I think the number 2, not sure
the weight of a box having of 100 kg is __n
Answer:
mom
Explanation:
Solve the science problem
Answer:
What is the problem I cant help unless you have the problem.
Explanation:
Answer:
what is the science problem??
Lichens are not single organisms, but algae and fungi that function together. The algae use photosynthesis to make food for both organisms. The fungi produce digestive chemicals and absorb nutrients for both organisms. How does the biological activity of lichens cause weathering in rocks? Answer options with 4 options A. Lichens cause friction as they grow, which weathers the rocks. B. Lichens produce chemicals, which dissolve and weather the rocks. C. Lichens take in water, which freezes in cracks and weathers the rocks. D. Lichens absorb heat during photosynthesis, which weathers the rocks.
Answer:
The correct answer is B
Lichens produce chemicals which dissolve and weather the rocks.
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
Trong chân không khi hai điện tích cách nhau lần lượt là d và d+10cm thì lực tương tác điện giữa chúng có độ lớn tương ứng là 2.0-6 N và 5.10-7 N tính giá trị của d
Answer:
H2O is also known as for water
A rock is thrown upward with a speed of 2.0m/s.
a. How long will it take the rock to reach the peak?
b. What is the maximum height it can reach?
Hi there!
(A)
When the rock reaches the peak, it will have a vertical velocity of 0 m/s. We can use the equation:
vf = vi + at
vf = final velocity (0 m/s)
vi = initial velocity (2 m/s)
a = acceleration (in this situation, due to gravity = 9.8 m/s²)
t = time (s)
0 = 2 + (-9.8)t
2/9.8 = t = .204 sec
(B)
Use the equation:
d = vit + 1/2at²
d = 2(.204) + 1/2(-9.8)(.204²)
d = .204 m
Make a
claim about whether a mixture could be made
up of only elements and no compounds.
Summarize evidence to support the claim and
explain your reasoning.
Answer:
Yes, a mixture can be made up of just elements and no compounds. The elements never experiance a chemical interaction and stay only in physical contact with each other.
BRAILIEST PLS I NEED LEVEL UP!
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:
Which vehicle will have more kinetic energy, a parked
semitruck or a car moving at 50 km/h?
Answer:
a semi truck
Explanation:
A roller is pushed with a force of 100 N along its handle, which is at an angle of 60 degrees with the horizontal. Find the work done in moving it through 20 m?
Answer:
1 kJ
Explanation:
By definition of work, [tex]W = \vec F \cdot \vec x = |\vec F| |\vec x| cos\angle Fx[/tex]. Let's replace the values: [tex]W = 100N\cdot 20m \cdot cos 60 = 1000 J[/tex]
What is the net force needed to accelerate a 1 kg textbook with an acceleration of
4 m/s2
Answer:
4 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question
mass = 1 kg
acceleration = 4 m/s²
We have
force = 1 × 4 = 4
We have the final answer as
4 NHope this helps you
an amusement park ride has two identical carriages that revolve around the center of the ride’s axle, as shown in the figure. both carts travel at a constant tangential speed at all points along the circular path. at what position is the total mechanical energy of the cart-cart-earth system at its maximum value?
The principle of conservation of energy allows to find the result for the mechanical energy of the system is:
Mechanical energy is conserved at all points, therefore at all points it has the same value.
Mechanical energy is defined by the sum of the kinetic energy and the potential energies.
Em = K + U
In the principle of energy conservation, it establishes that energy cannot be created or destroyed, it is only transformed, in the case of no friction, mechanized energy is conserved at all points.
They indicate that the system is rotating, which is why it is subjected to a force that expends its energy in changing the direction of the speed to keep the system in rotation, so the speed of the system remains constant.
Em = K = ½ I w²
Consequently, using the principle of conservation of energy we can find the result for the mechanical energy of the system is:
Mechanical energy is conserved at all points, therefore at all points it has the same value.
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if temperature is constant, the relationship between pressure and volume is
Answer: inversely proportional
Explanation:
Look at the circuit below. What is the potential difference across lamp 2?
The potential difference across lamp #2 is 4.5 volts.
a Name the store of energy when you are
pressing downwards on the stretchy skin
of the trampoline
Tell me in simple words what gravitation is.
Answer:
The movement, or a tendency to move, toward a center of gravity, as in the falling of bodies to the earth is called gravitation
You place a small sphere with a net charge of 5 space x space 10 to the power of negative 6 end exponent space C at one corner of a square that measures 5 m on each side. What is the magnitude of the electric field at the opposite corner of the square?
900 N/C
9,000 N/C
450 N/C
4,500 N/C
Determine the force required to move a block if the coefficient of static friction of one block and the floor is 0.35 and the coefficient of the static friction between 2 boxes is 0.25
Answer:
32.5
Explanation:
Choose the normal force acting between the object and the ground. Let's assume a normal force of 250 N .
Determine the friction coefficient. ...
Multiply these values by each other: (250 N) * 0.13 = 32.5 N .
You just found the force of friction!
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:
