Answer:
So first determine how many times does 5 go into 100.
100/5=20
Thus in 100 seconds the boy would have traveled a distance of 10 meters 20 times.
10*20=200
If the boy travels 10meters in 5 seconds, he travels 200m in 100seconds.
Here, we know that the the total distance is 10m and the total time is 5s . so the avg. speed is 10m5s=2m/s .
If this helped please give me brainliest!
heat engine accepts heat at a rate of 200 kw, and it produces a net power output of 50 kw. determine the thermal efficiency of this engine.
The thermal efficiency of this engine is calculated by taking the net power output of 50 kW and dividing it by the amount of heat input of 200 kW. Thus, the thermal efficiency of this engine is 25%.
The thermal efficiency of a heat engine is defined as the ratio of the net power output of the engine to the heat input. In this case, the heat engine is accepting heat at a rate of 200 kW and producing a net power output of 50 kW.
To calculate the thermal efficiency, we use the following equation: Thermal Efficiency = Net Power Output/Heat Input In this case, the net power output is 50 kW and the heat input is 200 kW. Therefore, the thermal efficiency of this engine is equal to 0.25 or 25%. It is important to note that the thermal efficiency of a heat engine is affected by several factors, such as the efficiency of the engine itself, the temperature of the heat source, the temperature of the heat sink, and the type of energy conversion being performed. Therefore, the thermal efficiency of any engine may vary from one situation to another.
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Krebs Cycle experiment: if you want to increase the rate of the succinate forming fumarate, what could you do to the experiment?
To increase the rate of the succinate forming fumarate you can increase the ATP and the enzyme that catalyzes this reaction
The Krebs cycle, also known as the citric acid cycle comprises a set of chemical reactions that are essential for organisms to obtain energy.
One of the steps in the cycle involves the use of succinate with a chemical formula of C4H6O4 to form fumarate or C4H4O4. This means in this reaction it is necessary to remove 2 hydrogen atoms.
This process requires two main factors:
ATP or energy the cell uses to carry out the reactionSuccinate dehydrogenase or the enzyme that removes the hydrogen atomsBased on this, the reaction can be faster if there is more succinate dehydrogenase or if the energy increases.
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On a planet in the solar system where the sky normally scatters light of lower frequencies, its sunsets would be?
The sky will appear in blue color at the sunset, if the sky of the planet scatters light of lower frequencies.
To find the answer, we have to know more about the scattering of light.
What is scattering of light?When light travels from one medium, like air or a glass of water, to another, scattering occurs. Part of the light is absorbed by the medium's particles, followed by subsequent radiation in a particular direction. The size of the scattered light's particles and its wavelength affect how intense it is.If the sky scatters a low frequency light, during sunset, this low frequency light will be totally absorbed by the atmospheric particles, and we can only be able to see the high frequency light.Thus, we can say that the sky will appear in blue color at the sunset, if the sky of the planet scatters light of lower frequencies.
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Which describes the role of the muscular system during physical activity?
Select all that apply.
1: It allows for movement.
2: It controls the breathing rate.
3: It forces venous blood to return to the heart.
4: It controls the heart rate.
Answer:
1.It allows for movement.
2.t controls the breathing rate.
4. It controls the heart rate.
Explanation:
A stationary 0.325 kg steel ball begins rolling down a frictionless track from a height h as shown in the diagram. It completes a loop-the-loop of radius 1.20 m with a speed of 6.00 m/s at the top of the loop. What is the gravitational potential energy of the ball at the top of the loop?
The ball at the top of the loop has a gravitational potential energy of 7.55 J.
The kinetic energy of the ball at the top of the loop is equal to its gravitational potential energy before it begins to fall. The total energy of the ball is the sum of its kinetic and gravitational potential energies. We can calculate the gravitational potential energy of the ball at the top of the loop by using the equation given below; PE=mghwhere, m=mass, g=acceleration due to gravity, and h=height above the reference level. Substituting the values we get, PE=(0.325 kg)(9.8 m/s2)(2.4 m)=7.55 J. Therefore, the gravitational potential energy of the ball at the top of the loop is 7.55 J. A stationary steel ball of 0.325 kg rolling down the track from height h completes a loop of radius 1.20 m with a velocity of 6.00 m/s at the top of the loop. We need to calculate the gravitational potential energy of the ball at the top of the loop. The gravitational potential energy of an object is the energy it possesses due to its height above the reference level. The kinetic energy of the ball at the top of the loop is equal to its gravitational potential energy before it begins to fall. The total energy of the ball is the sum of its kinetic and gravitational potential energies. We can calculate the gravitational potential energy of the ball at the top of the loop by using the equation given below; PE=mghwhere, m=mass, g=acceleration due to gravity, and h=height above the reference level. Substituting the values we get, PE=(0.325 kg)(9.8 m/s²)(2.4 m)=7.55 J. Therefore, the gravitational potential energy of the ball at the top of the loop is 7.55 J.For more questions on gravitational potential energy
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How can the temperature of an object, or fluid, be best described?
a. Measure of molecular activity
b. Measure of electrical resistance
c. Measure of gravitational force
d. Measure of light intensity
The temperature of an object, or fluid, can best be described as a measure of molecular activity. This is the most appropriate description of temperature.
Temperature is defined as a measure of the degree of hotness or coldness of a body, measured on a standard scale. The temperature of a fluid or an object can be measured using thermometers. There are several ways to describe the temperature of an object, including kinetic energy, vibrational energy, and molecular activity.
However, molecular activity is the most appropriate description of temperature because it refers to the movement of molecules within a substance. When the temperature of a substance increases, the molecules move faster, and vice versa.
Therefore, it is accurate to say that temperature is a measure of molecular activity since it measures how fast or slow the molecules are moving in a substance.
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All materials are made up of elements. Which of the following best describes elements? A. Mixtures combine in several different ways to make many kinds of elements. B. Elements are unable to combine in order to make different compounds. Elements combine in several different ways to make many kinds of compounds. > D. Compounds combine in several different ways to make a limited number of elements,
Answer:
a.
Explanation:
Answer:
I am pretty sure it is C!
Explanation:
According to www.open.edu,
Elements are substances that are made from one type of atom.
Compounds are substances made from atoms of different elements joined by chemical bonds.
A mixture is made by simply mixing together elements and compounds.
Atoms are the basic building blocks.
i think A is incorrect because, while the statement may be correct, it is talking about Mixtures, not elements themselves!
B is incorrect because elements ARE able to combine to form compounds!
D is incorrect because ELEMENTS combine to create compounds, i am pretty sure compounds don't combine to create elements.
Acceleration is a change in what quantity Over time?A- speed B- distance C- force D- displacement
To find
Acceleration is a change in what quantity Over time?
Explanation
Acceleration is defined as the change in velocity with respect to time interval.
Conclusion
The required quantity is
A. speed
Find the flux of the vector field across the curved sides of the surface . normal vectors point upward. set up the integral that gives the flux as a double integral over a region r in the xy-plane.
The flux of a vector field across the curved sides of a surface is given by the double integral over a region in the xy-plane.
1. Identify the surface and the vector field. Let's say the surface is S and the vector field is F.
2. Determine the normal vectors that point upward for the curved sides of the surface. These normal vectors will help in calculating the flux.
3. Set up the integral. The flux across the curved sides of the surface can be calculated using the double integral:
Flux = ∬ dA
Here, F · n represents the dot product of the vector field F and the normal vector n, and dA represents the differential area element on the surface.
4. Express the double integral over a region r in the xy-plane. To do this, we need to parameterize the surface S and express the normal vector n in terms of the parameters.
5. Evaluate the double integral. Depending on the complexity of the surface and vector field, you may need to use appropriate coordinate transformations or simplifications to evaluate the integral.
Remember to include the limits of integration for the double integral based on the region r in the xy-plane.
Note: Since the question only asks to set up the integral, you don't need to calculate the actual flux value.
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what happens to voltage if an equal number of positive and negative charges are at same location
If an equal number of positive and negative charges are at the same location, the voltage at that location would be zero.
This is because voltage is a measure of the potential energy difference between two points in an electric field, and if there are an equal number of positive and negative charges at the same location, the net electric field and potential energy difference would be zero.
The positive and negative charges would cancel each other out, resulting in no net electric field or potential difference. Therefore, the voltage would be zero at the location where the positive and negative charges are equal in number and co-located.
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Can a rock take only one path through the rock cycle?
define the unit of current
Answer:
The unit of current is defined as the flow of 1 coulomb of charge in one second
a boy on a skateboard coasts along at 12 m/s . he has a ball that he can throw at a speed of 15 m/s .part awhat is the ball's speed relative to the ground if he throws the ball forward?
The ball's speed relative to the ground is 15 m/s.
Ball's speed relative to the ground, we need to subtract the skateboarder's speed from the total speed of the ball.
The ball's speed relative to the ground is the speed at which the ball is moving relative to the ground, and it is given by:
Ball's speed relative to the ground = 15 m/s
We know that the boy on the skateboard is moving at 12 m/s relative to the ground. So the total speed of the ball and the boy is:
Total speed = Ball's speed relative to the ground + Boy's speed relative to the ground = 15 m/s + 12 m/s = 27 m/s
To find the boy's speed relative to the ground, we can use the following equation:
Boy's speed relative to the ground = Total speed - Skateboarder's speed = 27 m/s - 12 m/s = 15 m/s
Therefore, the ball's speed relative to the ground is 15 m/s.
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A ball is initially moving with a velocity 0.5m/s. Its velocity decreases at a rate of 0.05m/s^2. How much time will it take to stop? How much distance will the ball travel before it stops
Answer: t = 10 s , s = 2,5 m
Explanation: (1) Speed v = v0 + at and (2) distance s = v0t + ½at².
Now v0 = 0.5 m/s , v = 0 and a = -0.05 m/s²
Solve from equation (1) t = -v0 / a = - 0.5 m/s / -0.05 m/s² = 10 s
Add t = 10 s to equation (2 ) s = 0.5 m/s · 10 s + 0.5· (-0.05 m/s²)· (10 s)²
= 5 m - 2,5 m = 2,5 m
what initial mass of 23592u is required to operate a 950- mw reactor for 1 yr? assume 24 % efficiency
The initial mass of 235U required to operate a 950-MW reactor for 1 year with 24% efficiency is about 146.72 kg.
How calculate the initial mass of 235U required to operate a 950-MW reactor?To calculate the initial mass of 235U required to operate a 950-MW reactor for 1 year, we need to use the following formula:
mass of 235U = (energy output x time x efficiency) / (energy per fission x number of fissions per atom x mass per atom)
First, we need to calculate the energy output of the reactor for 1 year. To do this, we can use the following formula:
energy output = power x time
where power is the power output of the reactor (950 MW) and time is the operating time of the reactor in seconds. Since there are 365 days in a year and 24 hours in a day, the operating time of the reactor in seconds is:
operating time = 365 days x 24 hours/day x 3600 seconds/hour = 31,536,000 seconds
Therefore, the energy output of the reactor for 1 year is:
energy output = 950 MW x 31,536,000 s = 2.9988 x 10^16 J
Next, we need to calculate the energy per fission of 235U. The average energy released per fission of 235U is about 200 MeV or 3.204 x 10^-11 J.
The number of fissions per atom of 235U is around 2.5, which means that each fission of 235U releases 2.5 x 3.204 x 10^-11 J of energy.
The mass per atom of 235U is about 235 g/mol, which is equivalent to 3.90 x 10^-22 kg/atom.
Plugging these values into the formula, we get:
mass of 235U = (energy output x time x efficiency) / (energy per fission x number of fissions per atom x mass per atom)
mass of 235U = (2.9988 x 10^16 J x 1 year x 0.24) / (2.5 x 3.204 x 10^-11 J x 3.90 x 10^-22 kg/atom)
mass of 235U = 146.72 kg
Therefore, the initial mass of 235U required to operate a 950-MW reactor for 1 year with 24% efficiency is about 146.72 kg.
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I NEED ANSSWER IN THE NEXT 5 MINITES. OR NO BRAINLY REWARD.
a rock which has the mass of 25 kg is on a cliff 42 m high. Calculate the rocks potential energy. Given g = 10 m/s^2. NO FALSE ANSWERS ACCEPTED.
1,050 J
10,500 J
5,250 J
220,500 J
1050
Explanation:
you have to multiply 25kg time42m
A 3-column table with 4 rows. The first column titled substances has entries aluminum, zinc, chromium, nickel. The second column titled density has entries 2.70 grams per centimeter cubed, 7.13 grams per centimeter cubed, 7.18 grams per centimeter cubed, 8.90 grams per centimeter cubed. The third column titled mass has entries 4.60 grams, 9.81 grams, 6.24 grams, 3.17 grams. Use the information in the table to identify the metal with a volume of 1.38 cm3. aluminum zinc chromium nickel
Answer: The metal with a volume is zinc.
Explanation: Got it right on Edge2020
Answer:
A 2-column table with 4 rows. The first column has entries glass, baby oil, maple syrup, wax. The second column has entries 2.40 grams per centimeter cubed, 0.83 grams per centimeter cubed, 1.37 grams per centimeter cubed, 0.93 grams per centimeter cubed.
Use the information in the table to predict whether each substance will sink or float in water. Note that the density of water is 1.0 g/cm3.
Glass:
✔ sinks
Baby oil:
✔ floats
Maple syrup:
✔ sinks
Wax:
✔ floats
which graph above best illustrates homeostasis
Brandon buys a new seadoo he goes 12 km north from the beach he jumps wakes for 6 km to the east the chases a boat 10 km north what distance did he cover what was his displacement
Answer:
Distance covered 28 km
displacement is 22.8 km North-East
Explanation:
Distance shows how far apart objects or points are from each other. The distance he covered is the sum of all the distance travelled. Therefore:
Distance covered = 12 km + 6 km + 10 km = 28 km
Displacement is a vector quantity (has direction). It is the overall change in position.
The total distance traveled north = 12 km + 10 km = 22 km
The distance traveled east = 6 km
The displacement (d) is:
d² = 22² + 6² = 484 + 36
d² = 520
d = √520 = 22.8 km
Therefore the displacement is 22.8 km North-East
Distance covered 28 km
displacement is 22.8 km North-East
The calculation is as follows:
Distance covered
= 12 km + 6 km + 10 km
= 28 km
Now
The total distance traveled north = 12 km + 10 km = 22 km
And,
The distance traveled east = 6 km
So,
The displacement (d) is:
\(d^2 = 22^2 + 6^2\\\\ d^2 = 520\\\\d = \sqrt520\)
= 22.8 km
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express the current i1 going through resistor r1 in terms of the currents i2 and i3 going through resistors r2 and r3. use the direction of the currents as specified in the figure.
To express the current i1 in terms of the currents i2 and i3, we can use Kirchhoff's current law (KCL), which states that the sum of currents entering a node is equal to the sum of currents leaving the node. In this case, the node where i1, i2, and i3 meet is the point of interest.
Based on the direction of the currents specified in the figure, we can write the equation:
i2 + i3 = i1
This equation represents the application of KCL at the node where i1, i2, and i3 are connected. According to KCL, the sum of currents entering the node (i2 and i3) is equal to the sum of currents leaving the node (i1).
Therefore, the expression for the current i1 in terms of i2 and i3 is:
i1 = i2 + i3
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how is the effect of balanced forces different from that of unblanced forces on the motion of an object
Answer:
Balanced forces do not result in any change in motion.
Explanation
forces applied to an object in opposite directions that are not equal in size. Unbalanced forces result in a change in motion. friction the force that opposes the motion or tendency toward motion of two objects that are in contact.
Answer:
balanced forces are equal in size and opposite in direction
While on the moon, Buzz Aldrin carried on his back a support system that would
weigh over 1,775 N on Earth. What did the backpack weigh on the moon? (gravity
on the moon is 1.62 m/s^2)
Answer:
W' = 287.55 N
Explanation:
We know that weight force is defined as follows:
W = m × g
So:
On Earth (W = 1775 N):
1775 = m × 9.8
m = 1775 / 9.8
m = 181.12 kg
On the Moon (g' = 1.62 m/s²):
W' = m × g'
W' = 181.12 × 1.62
W' = 293.42 N
PLEASE HELP, NO ONE IS HELPING MEEEE :(
While taking the stairs it takes you 10 seconds to reach the top. The next time you take the same stairs, it takes you 5 seconds to reach the top stair. During which of these trips up the stairs did you use more power to climb?
Answer:
probably the trip where it took u 5 seconds
differentiate between
Average velocity and relative velocity
Answer:
Average velocity
The average velocity of an object is its total displacement divided by the total time taken. In other words, it is the rate at which an object changes its position from one place to another. Average velocity is a vector quantity. The SI unit is meters per second(m/s).
Example of Average velocity
Someone who takes 40 minutes to drive 20 miles north and then 20 miles south (to end up at the same place), has an average speed of 40 miles divided by 40 minutes, or 1 mile per minute (60 mph). Average velocity, however, involves total displacement, instead of distance.
Relative velocity
The velocity of an object A relative to another object B is the velocity that objects A would appear to have to an observer moving with B. One obvious example of this is to work out how long it will take two objects traveling along a line at different velocities to collide
Example of Relative velocity
You are in a bus and it goes with a velocity of 50 m/s to the east, then a truck passes you with a velocity of 60m/s to the east. Velocity of the moving objects with respect to other moving or stationary object is called “relative velocity” and this motion is called “relative motion”.
An isotope of Technetium has a half-life of 6 hours. If it is given to a patient as part of a medical procedure,
what fraction of the radioisotope remains in the body after one day?
atoms and molecules in matter are always_______
I think atoms and molecules in matter are always in motion because of kinetic energy.
Answer:
in motion.
Explanation:
In chemistry, we often explain the states of matter in terms of the kinetic molecular theory (KMT). The word kinetic refers to motion and the kinetic molecular theory suggests that atoms and molecules are always in motion. The energy associated with this motion is termed kinetic energy.
Point out the following about solids: The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.
They are not always in motion. They are always in motion if and only if the temperature of the surroundings is greater than absolute zero ( 0 K ).
Not only are molecules really small but they are in constant motion. The motion is called “thermal motion” because it's caused by temperature. Increase the temperature around them and the molecules move faster.
What direction would the net force acting on this box be pointed?
northeast
northwest
southeast
southwest
Answer:
The diagram shows a net 2 N in the north direction and 2 N in the east direction - this would result in (4 + 4)^1/2 to the northeast.
An EEG record has 3/sec spike and wave discharges. Both the
spike and the slow wave have voltages of 100 uV. If this discharge
is recorded with a LFF of 5 Hz and a sensitivity of 10 uV/mm, what
would
EEG records the electrical activity of the brain. It measures the electrical activity generated by the neurons of the brain and is recorded by electrodes placed on the scalp. It is used to diagnose and monitor several neurological disorders such as epilepsy, sleep disorders, and brain injuries, among others.
The EEG recording consists of various wave patterns that differ in frequency, amplitude, and shape. The wave patterns are classified into five categories based on their frequency, including delta, theta, alpha, beta, and gamma waves.
The given EEG record has a 3/sec spike and wave discharges, both with voltages of 100 uV. This discharge is recorded with a LFF of 5 Hz and a sensitivity of 10 uV/mm.
To determine the amplitude of the spike and wave discharges, we can use the following formula:
Amplitude (uV) = Voltage (uV) x Sensitivity (mm/uV)
Amplitude of spike and wave discharges = 100 uV x 10 uV/mm = 1000 mm
The amplitude of the spike and wave discharges is 1000 mm.
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if a car travels 270 meters in 30 seconds then what is its average speed
Answer:
the answer is 32,400
Explanation:
I looked it up for you
The average speed denotes the average rate of speed over the extent of a trip. The average speed of a car which travels 270 meters in 30 seconds is 9m/s.
What is average speed?The average speed can be defined as the ratio of the total distance travelled by an object to the total time taken. It is a scalar quantity. It is represented by the magnitude and does not have direction. Its SI unit is m/s.
The average speed of an object help us to calculate the rate of travel time and the distance. The average speed of an object when it covers the same distance at two different speed, X and Y is:
Average speed = 2XY/ X+Y
The equation used here to calculate the average speed is:
Average speed = Total distance / Total time
Average speed = 270 m / 30 s = 9 m/s
Thus the average speed is 9 m/s.
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When there is an increasing unbalanced force applied in the opposite direction as the motion, speed will ___________________ and acceleration will ________________________.
When there is an increasing unbalanced force applied in the opposite direction as the motion, speed will decrease and acceleration will increase.
What is Acceleration?This is defined as the rate of change of velocity with time and the unit is metres per seconds.
An unbalanced force will lead to the speed of the object decreasing as a result of the distance reached being on a decline. However, the acceleration will increase due to the applied force in which they have a direct relationship.
This is therefore the reasons why they were chosen as the most appropriate choice.
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