Answers
Answer:
The correct option is;
The assertion is correct, but reason wrong
Explanation:
The question is with regards to the relationship between work, energy, power, and velocity
The mass of each of the persons running up the staircase = Different
The time it takes each person to run up the stairs = Equal time
Let, 'm₁' and 'm₂' represent the mass of each of the persons that ran up the stairs and m₁ > m₂
Let 't' represent the equal time it takes then to run up the stairs
Let 'h' represent the height of the stairs
The energy, 'E', it takes to run up the stairs is equal to the potential energy, P.E., obtained at the top of the stairs
P.E. = m·g·h
Where;
m = The mass of the person at an elevated height
g = The acceleration due to gravity = Constant
h = The height reached above ground level
Given that the height reached is the same for both of the persons, we have
For m₁, P.E.₁ = m₁·g·h and for m₂, P.E.₂ = m₂·g·h
Therefore, where, m₁ > m₂, we have;
P.E.₁ > P.E.₂
∴ E₁ > E₂
Power, 'P', is the rate at which energy is expended
∴ Power, P = E/t
∴ P₁ = E₁/t > P₂ = E₂/t
Therefore, the person with the greater mass, 'm₁', uses more power than the person of mass 'm₂', in running up the stairs
Therefore, the assertion is correct
The average velocity, vₐ = (Total distance traveled, d)/(Total time taken, t)
Given that the distance, 'd', covered in running up the stairs by both persons is the same, and the time it takes them to complete the distance, 't', is also the same, we have;
The average velocity of the person with the greater mass m₁ is the same as the average velocity of the person with mass, m₂
Therefore, the reason is wrong
The answer is that the assertion is correct, but reason wrong
Related Questions
Which pair of element types is most likely to share valence electrons in a
covalent bond?
A. Two metals
B. A metal and a nonmetal
C. Two nonmetals
D. A metal and a metalloid
Answers
Answer:
It's C, you guys!!!!
Explanation:
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Answers
in a nuclear plant, 1 * 10 ^27 J of energy is available from mass conversion How much mass was lost ?
Answers
Answer:
[tex]1.2\times 10^{10}\ kg[/tex]
Explanation:
Given that,
The energy of the nuclear plant, [tex]E=10^{27}\ J[/tex]
We need to find how much mass wast lost.
The relation between energy and mass is given by :
[tex]E=mc^2[/tex]
Where
c is speed of light
[tex]m=\dfrac{E}{c^2}\\\\m=\dfrac{10^{27}}{(3\times 10^8)^2}\\\\m=1.2\times 10^{10}\ kg[/tex]
So, [tex]1.2\times 10^{10}\ kg[/tex] of mass was lost.
HELPPP PLEASE URGENT
Answers
On Earth, a scale shows that you weigh 585 N. What would the scale read on the Moon (g = 1.60 m/s2)? N
Answers
Answer:
95.51 N
Explanation:
First, find the mass in kg:
Fg = 585 N
Fg = m*g
585 N = m*9.8 m/s^2
m = 59.69 kg
Then, to find your weight (Fg) on the moon, you use the same equation of
Fg(moon) = m*g, except this time g = 1.60 m/s^2
Fg(moon) = 59.69 kg * 1.60 m/s^2
Fg(moon) = 95.51 N
Hope this helps!! :)
A hiker has determined which hiking path to take through a national forest (A is the starting point and B is the final destination). Below is the map of that trail. What does the red line most likely represent?
Total displacement from A to B
Total distance of the path from A to B
Both Total displacement and distance of path from A to B
The shortest path between A and B
In the following equation, Vi represents initial velocity and Vf represents final velocity. The equation for average acceleration is a = (Vf - Vi)/t. Solve this formula for t.
t = a/(Vf - Vi)
t = (Vf - Vi)/a
t = a(Vf - Vi)
t = (Vf - Vi)a
Select the 2 equations that show the same correct relationship between Average Velocity, Distance, and Time.
d = vt
t = v/d
v = t/d
v = d/t
NEED HELP ASAP PLEASE HELP
Answers
Which will increase the energy of motion of water molecules?
Answers
Emily is pushing a toy sand truck. She realizes it is much harder to push the truck when it is full of sand than when it is empty. What is the reason for this?
An object with a greater mass requires a smaller force to accelerate.
An object with a greater mass requires a greater force to accelerate.
An object pushed with a greater force has a greater mass.
An object pushed with a greater force has less mass.
Answers
Answer: An object with a greater mass requires a greater force to accelerate.
Explanation:
Answer:
An object with a greater mass requires a greater force to accelerate.
Explanation:
I took the test.
Why does a lunar eclipse last for a few hours whereas a solar eclipse only lasts for a few minutes?
Select one:
a.
The moon takes more time to travel through the earth’s umbra.
b.
Because the moon is moving much more slowly than the sun.
c.
Solar and lunar eclipses actually last about the same time.
d.
Because the sun is stationary and the moon is moving.
Answers
Answer:
The type and length of a lunar eclipse depend on the Moon's proximity to either node of its orbit. ... A total lunar eclipse can last up to nearly 2 hours, while a total solar eclipse lasts only up to a few minutes at any given place, due to the smaller size of the Moon's shadow.
What is a gear. Please give detailed explanation
Answers
Answer:
gear is part of vehicle.it helps.
Answer:
Explanation:
A gear is a device that transfers mechanical energy from on point to another.
A horizontal force 20N is required to just slide a block of mass 6kg on a horizontal platform. The coefficient of limiting friction between the block and the platform is ?( g = 10 m/s).
Answers
Answer:
0.33
Explanation:
R= 60N
coefficient of limiting friction = F/R
= 20/60 = 0.33
-A 180 kg hippo is riding a bicycle at a speed of 6.0
m/s. Out of nowhere, a chimpanzee runs out in the
hippo's path and he must slam on his brakes. If the
bicycle's brakes exert a force of 1600 N, how
long will it take to stop the bicycle? _s
Answers
Answer:
0.0675 seconds
Explanation:
From the question,
We apply newton's second law of motion
F = m(v-u)/t.................... Equation 1
Where F = force exert by the brake, v = final speed, u = initial speed m = mass of the bicycle, t = time.
make t the subject of the equation
t = m(v-u)/F................... Equation 2
Given: m = 180 kg, u = 6.0 m/s, v = 0 m/s (comes to stop), F = -1600 N ( agianst the dirction of motion)
Substitute these value into equation 2
t = 180(0-6.0)/-1600
t = -1080/-1600
t = 0.0675 seconds.
10. CALCULATE: Find the amount of power used in
each of the following examples. Show your
calculations.
a. You use a force of 10 N to move a box
100 m in 10 seconds.
b. An athlete lifting weights does 900 J of
work in 1 second.
c. A truck does 30,000 J of work in
15 seconds.
d. A furniture mover uses a force of 150 N to
push a large trunk 5 m across the floor in
5 seconds.
Answers
Answer:
Please find attached pdf
Explanation:
please help me anyone i will mark brainliest
Answers
Answer:
for 4.567 I can't tell if it x [tex]10^{3}[/tex] or x [tex]10^{5}[/tex] so:
answer using x [tex]10^{3}[/tex] = 0.0000644697N
answer using x [tex]10^{5}[/tex] = 0.00644697
Explanation:
use equation F = GMm/[tex]R^{2}[/tex]
what is CHA-CHA-CHA.
Answers
Answer:
The cha-cha-cha, is a dance of Cuban origin. It is danced to the music of the same name introduced by Cuban composer and violinist Enrique Jorrin in the early 1950s. This rhythm was developed from the danzón-mambo
State galileo's law of inertia
Answers
Answer:
Galileo's law of inertia states that; if no net force acts on an object, the object maintains its state of motion.
(The first law of motion is also known as Galileo's law of inertia)
MC Qu. 82 A design engineer wants to construct a sample... A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results: Sample Service Life (hours) 1 495 500 505 500 2 525 515 505 515 3 470 480 460 470If he uses upper and lower control limits of 520 and 480 hours, what is his risk (alpha) of concluding servicelife is out of control when it is actually under control (Type I error)? A. 0.0026B. 0.0456C. 0.3174D. 0.6826E. 0.9544
Answers
Answer:
B) 0.0456
Explanation:
It is given that :
Rationale :
UCL = 480
LCL = 480
∴ Mean , [tex]$\bar X = 500$[/tex]
The standard deviation of sample (Sn) = 11.55
Z (for UCL) [tex]$=\frac{\text{UCL - Mean}}{\text{Sn}}$[/tex]
[tex]$=\frac{520-500}{10}$[/tex]
= 2
Similarly,
Z (for LCL) [tex]$=\frac{\text{LCL - Mean}}{\text{Sn}}$[/tex]
[tex]$=\frac{480-500}{10}$[/tex]
= -2
Now using the z table for finding the confidence level between Z value of -2 and 2.
Confidence level = 0.4772 + 0.4772
= 0.9544
Risk (alpha) = 1 - confidence level
= 1 - 0.9544
= 0.0456
Answer all of this questions and you will get the brain list
Answers
see below
Explanation:
let One Direction to be the positive and the other direction be negative
let right = positive
left = negative
up = positive
down = negative
a) 100 - 50 = 50N
b) 500 - 330 = 170N
c) 70 - 70 = 0 N
hope this helps
please mark it brainliest
What determines what we call the phases of the
moon?
Different fractions of the moon
Areas of the moon we cannot see
Days on the calendar
No answer text provided.
Answers
Two fixed charges, q1 = +1.07µC and q2 = -3.28µC, are 61.8cm apart. Where may a third charge be located so that no net force acts on it?
Answers
Answer:
12...lollll
Explanation:
.
Answer:
Can u re-write the question please, I dont understand?
Explanation:
What is one source error associated with self-report inventories, and what is one of its solutions?
Answers
Answer:
Explanation:
One source error is deliberate deception, and one of its solutions is having a lie scale inserted into the assessment. Another source error is social desirability, and one of its solutions is locating questions sensitive to bias and changing or dropping them. Another source error is response set, and two of its solutions are using word variations and writing questions on the assessment in different ways.
4. Determine the net force for the free-body
diagram
Fnorm = 40N
Ffrict =28N
Fapp =44N
Fgrav = 40N
Answers
Answer:
Fapp =44N is the correct answer
Explanation:
Please mark brainliest
A _____ is a device that uses a smaller current to control a larger current. fuse rheostat relay switch circuit breaker
Answers
Answer:
relay switch
Explanation:
relay switch is the answer
20 points + Brainliest. Please help!
Which process represents a charge from disorder to order?
A. The free expansion of a gas into a vacuum
B. The condensing of a gas to a liquid
C. The melting of an ice cube in warm water
D. The flow of heat from the interior of a refrigerator to the exterior.
Answers
Answer:
C. the melting of an ice cube in warm water
Answer: d,a,b,c
i think i dont know if u asked for this answr. but i hope this helped
Explanation:
The speed of a 1200 kg car increases from 5 to 29 m/s in 12 s.
What force accelerated the car?
Answers
Answer:I think I’m not sure But I think that the force that would be accurated the car would be friction or something like that and to solve the equation you would do f/m
Explanation:
It just makes sense
RNA is ______________________stranded. It _______________ leave the nucleus, unlike DNA. It still consists of __________________, however the _____________ in the backbone of the strand is different than in DNA.
The nitrogenous bases are different in RNA; instead of Thymine, Adenine now pairs with _____________________.
Answers
Answer:
See below
Explanation:
RNA is single-stranded. It does leave the nucleus, unlike DNA. It still consists of strands, however, the ribose in the backbone of the strand is different than in DNA.
The nitrogenous bases are different in RNA; instead of Thymine, Adenine now pairs with Cytosine.
Identify the magnetic North Pole of earth's magnet
Answers
Answer:
Using a Compass to Identify Magnet North Pole
Watch carefully at where the compass needle points. The point that normally points to the north pole of Earth should point to one end of the magnet. That end is actually the South pole of the magnet
Explanation:
Hope it help you
Plz mark my answer brainliest✍️✍️
What is the kinetic energy of a 0.500 kg toy car moving at a state of 1.50 m/s
Answers
Answer:0.563
Explanation:
The kinetic energy produced in a toy car is equal to 0.563 J.
What is the kinetic energy and potential energy?The energy exhibited by a moving body because of its motion is said to be its kinetic energy. Work should be done which can change the kinetic energy of a moving object.
The kinetic energy of a moving object can be determined from the formula mentioned below:
K.E. = ½mv² where ‘m’ and ‘v’ is the mass, velocity of the object.
Potential Energy (P.E.)is energy that is stored in an object due to its position and can be expressed as P.E = mgh where h, m, and g are the height, mass, and gravitational acceleration respectively.
Given, the mass of the toy car =, m = 0.500 Kg
The velocity of the toy car, v = 80 m/s
The kinetic energy = (1/2)× 0.500 ×(1.50)²
K.E. = 0.563 J
Learn more about kinetic energy, here:
brainly.com/question/15764612
#SPJ2
A ball with an initial velocity of 12 m/s is rolling up a hill. The ball accelerates at a rate of -2.6 m/s/s.
Answers
Answer:
4.61 seconds
Explanation:
Given data
Initial velocity= 12m/s
acceleration= -2.6m/s^2
From the given data
we can find the time t
we know that
Acceleration= velocity/time
time= velocity/acceleration
time= 12/2.6
time= 4.61 seconds
How do prey and predator affect the resources in an environment?
