Answer:
Yes labor is required therefor jobs like cashier, and other low skill labor jobs I'll not be required
Explanation:
For the PE formula, why is the height required for calculations? Why do we need to know the height in order to determine PE? *
Answer:
Answer in Explanation
Explanation:
Whenever we talk about the gravitational potential energy, it means the energy stored in a body due to its position in the gravitational field. Now, we know that in the gravitational field the work is only done when the body moves vertically. If the body moves horizontally on the same surface in the Earth's Gravitational Field, then the work done on the body is considered to be zero. Hence, the work done or the energy stored in the object while in the gravitational field is only possible if it moves vertically. This vertical distance is referred to as height. This is the main reason why we require height in the P.E formula and calculations.
The derivation of this formula is as follows:
Work = Force * Displacement
For gravitational potential energy:
Work = P.E
Force = Weight = mg
Displacement = Vertical Displacement = Height = h
Therefore,
P.E = mgh
Determine the components, the magnitude and the angle (counter-clockwise with respect to the positive x axis) of the resultant vector, R = B + C. Given: 0 Vector B: magnitude = 5.00 units, angle = 115 . 0 Vector C: magnitude = 4.00 units, angle = 255 .
Answer:
Explanation:
We shall represent vector B and C in terms of i and j .
B = 5 cos115 i + 5 sin115 j
= -2.11 i + 4.53j
Similarly
C = 4 cos255 i + 4 sin225 j
= -1.04 i -3.86 j
R = B + C
= -2.11 i + 4.53j -1.04 i -3.86 j
= -3.15 i + .67 j
magnitude of R
= √( 3.15² + .67² )
= √( 9.92 +.45 )
= 3.22
Angle Ф
TanФ = - .67 / 3.15
= - .21
Ф = - 12⁰
= 180 - 12
= 168 degree counterclockwise from positive x axis.
2. A go-cart travels once around a circular track with a radius of 200m. What is its
displacement?
A)200 m
B)1256.64 m
C)100 m
D)0 m
Answer:
ggggggg
Explanation:
what are erthpuaks and why do thay hapen
Answer:
earthquakes are violent ruptures that happen in the earth that causes a giant ravine and they happen when the plates of earth separate
What would happen if you put a material between each marble? Newton's Cradle
Answer:
Explanation:
Momentum is the mass of a moving body times its velocity. It can be transferred from one object to another
The greater an objects mass... The?
A) the less gravity it has
B) the greater the gravity it has
C) it’s gravity dosent change
D) the less weight
Answer:
B
can i be brainlyest
Explanation:
Connie flew from Phoenix to flagstaff, a distance of 180 miles at a constant speed of 180 miles per hour. She then returned to the same airport at a cj stand speed of 90. Miles per hour. What was connies average speed in miles/ hour
Answer:
Average Velocity = 120 mi/h
Explanation:
First we need to calculate the time taken by Connie to complete first half from Phoenix to flagstaff. So, we use:
s₁ = v₁t₁
where,
s₁ = distance from Phoenix to flagstaff = 180 miles
v₁ = speed of travel from Phoenix to flagstaff = 180 mi/h
t₁ = time taken to travel from Phoenix to flagstaff = ?
Therefore,
180 miles = (180 m/h)t₁
t₁ = 1 h
Now, we calculate the time for the return trip
s₂ = v₂t₂
where,
s₂ = distance from flagstaff to Phoenix = 180 miles
v₂ = speed of travel from flagstaff to Phoenix = 90 mi/h
t₂ = time taken to travel from flagstaff to Phoenix = ?
Therefore,
180 miles = (90 m/h)t₂
t₂ = 2 h
Now, we find total time:
t = t₁ + t₂
t = 1 h + 2 h
t = 3 h
and the total distance was:
s = s₁ +s₂
s = 180 mi + 180 mi
s = 360 mi
So, the average velocity will be:
Average Velocity = s/t
Average Velocity = 360 mi/3 h
Average Velocity = 120 mi/h
If a wave’s frequency is 16Hz and it’s wavelength is 10m. What’s the waves speed?
Answer:
160J
Explanation:
Given parameters:
Frequency = 16Hz
Wavelength = 10m
Unknown:
Waves speed = ?
Solution:
Waves speed is the product of frequency and wavelength;
Waves speed = fλ
f is the frequency
λ is the wavelength
Now insert the parameters and solve;
Waves speed = 16 x 10 = 160J
What is the purpose of radio waves?
Answer:
Explanation:
The prime purpose of radio is to convey information from one place to another through the intervening media (i.e., air, space, nonconducting materials) without wires. Besides being used for transmitting sound and television signals, radio is used for the transmission of data in coded form.
how are electrical current measured
Answer:
ammeter
Explanation:
hope this helps
At which position is the Southern Hemisphere experiencing winter?
A. A
B. B
C. C
D. D
Answer:
A
Explanation:
At C, it's summer in the southern hemisphere due to it receiving the most amount of sunlight that, at A, earth is tilted so that the northern hemisphere receives the most amount of sunlight (making it winter for the southern hemisphere)
20 g of water (specific heat of water is 4.18 J / g °C) undergoes a temperature change from 25° C to 20° C. How much heat energy moved from the water to the surroundings?
Answer:
418J
Explanation:
Given parameters:
Mass of water = 20g
Specific heat capacity of water = 4.18J/g°C
Initial temperature = 25°C
Final temperature = 20°C
Unknown:
Amount of heat lost to the surroundings = ?
Solution:
The amount of heat lost to the surrounding is the same as the quantity of heat needed to take down the temperature of the water.
Now, to solve this problem, use the mathematical equation below;
H = m c (T₂ - T₁)
H is the amount of heat
m is the mass
c is the specific heat capacity
T is the temperature
1 and 2 are initial and final states.
Now insert the parameters and solve;
H = 20 x 4.18 x (20 - 25)
H = -418J
The quantity of heat the moved from water to the surrounding is 418J
The question and answer options are in the photo!
Identifying Mechanical Energy Which image shows both potential and Kinet energy Α Α Α
Answer:
What is Kinetic and Potential Energy? In Physics, energy is used to refer to an ability to do work. Energy exists in various forms. This includes Gravitational energy, Chemical energy, Radiant energy, Mechanical energy, Sonic energy, Thermal energy, Nuclear or atomic energy, Magnetic energy and Electrical energy amongst many others.
Explanation:
Answer:
Um show me a picture or show me the image so I can Give you answer in the comments
Explanation:
Question 4 Multiple Choice Worth 4 points)
(02.02 MC)
How do weathering and deposition differ?
Answer:
its A Weathering breaks down rocks; deposition leaves them in new places
Explanation:
Siruis, the brightest star in the night sky, has a luminosity of 22. This means that Sirius: A, B, C, D QUESTION
A: developed 22 years before the sun
B: is 22 times farther from Earth than the sun
C: gives off 22 times more energy than the sun
D: is 22 times bigger in size than the sun
Answer:
i think C
Explanation:
How long does it take (in seconds) a 80,000 W motor to do 3,000,000 J of work?
A 5 Kg bucket is being lifted by Sue straight up. A)If Sue is lifting the bucket up with constant velocity with what force is she lifting the bucket with? B) If Sue uses the same force and lifted the bucket on the moon which has a gravitational pull of 1.6 m/s2, with what acceleration will the bucket rise?
Answer:
A) Sue is lifting the bucket by a force of 49.035 newtons.
B) The bucket has an acceleration of 8.207 meters per square second on the Moon.
Explanation:
A) According to the First Newton's Law, a system is at equilibrium when it is either at rest or travelling at constant velocity. In this case, Sue must exert an external force on the bucket, whose magnitude is equal to the weight of the bucket but direction is opposed to it. By Second Newton's Law, we find that:
[tex]\Sigma F = F - m\cdot g = 0[/tex] (1)
Where:
[tex]F[/tex] - Lifting force, measured in newtons.
[tex]m[/tex] - Mass of the bucket, measured in kilograms.
[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.
If we know that [tex]m = 5\,kg[/tex] and [tex]g = 9.807\,\frac{m}{s^{2}}[/tex], then the lifting force is:
[tex]F = m\cdot g[/tex]
[tex]F = (5\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)[/tex]
[tex]F = 49.035\,N[/tex]
Sue is lifting the bucket by a force of 49.035 newtons.
B) By the Second Newton's Law, we have the following model:
[tex]\Sigma F = F-m\cdot g = m\cdot a[/tex] (2)
Where [tex]a[/tex] is the net acceleration of the bucket, measured in meters per square second.
If we know that [tex]F = 49.035\,N[/tex], [tex]m = 5\,kg[/tex] and [tex]g = 1.6\,\frac{m}{s^{2}}[/tex], then the net acceleration of the bucket is:
[tex]a = \frac{F}{m} -g[/tex]
[tex]a = \frac{49.035\,N}{5\,kg}-1.6\,\frac{m}{s^{2}}[/tex]
[tex]a = 8.207\,\frac{m}{s^{2}}[/tex]
The bucket has an acceleration of 8.207 meters per square second on the Moon.
(a) The force applied by Sue in lifting the bucket at a constant velocity is 49 N.
(b) The acceleration of the bucket when lifted on the moon is 8.2 m/s².
The given parameters;
mass of the bucket, m = 5 kgThe force applied by Sue in lifting the bucket at a constant velocity is calculated as;
[tex]F = m(a + g)[/tex]
at constant velocity, a = 0[tex]F= mg\\\\F = 5 \times 9.8\\\\F = 49 \ N[/tex]
The acceleration of the bucket when lifted on the moon with the calculated force is;
[tex]F = m(a + g)\\\\a+g = \frac{F}{m} \\\\a = \frac{F}{m} - g\\\\a = \frac{49}{5} - 1.6\\\\a = 8.2 \ m/s^2[/tex]
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Someone help with this also
!!!!Has anybody done the Lab report : Thermal Energy Transfer on edg? For physics
2 pages of data
Answer: the only thing I can't give you is the lab report because I haven't done it yet i dont want to lol.
Explanation:
i got a bunch of answers so if my answers are correct im putting them here
Imagine that a loudspeaker is producing a quiet tone with a low pitch. How will its vibrations change:
a. if the pitch of the note becomes higher?
b. if the note becomes louder?
Lizard able to run in ceilings and walls.why?
Answer:
because of their web feet
Explanation:
oke
Answer:
Reptiles have an enormous number of extremely minuscule hairs on the stack of their feet called setae. These little cushions subsequently radically increment the surface zone and come in close contact with the surface on which the reptile is creeping, so the Van der Waals forces kick in.
Explanation:
Hope this helped!
When your teacher drops a 1.5kg book from rest, it speeds up as it falls down suppose that book hits the ground at a speed of 5m/s what hight was it dropped from
Answer:
The height in which the book is dropped from is 1.28 m.
Explanation:
Mass of the book, m = 1.5 kg
initial velocity of the book, u = 0
final velocity of the bok, v = 5 m/s
The height in which the book is dropped from is given by;
v² = u² + 2gh
v² = 0 + 2gh
v² = 2gh
h = v² / 2g
h = (5)² / (2 x 9.8)
h = 1.28 m
Therefore, the height in which the book is dropped from is 1.28 m.
a current of 2a is switched on for 8 seconds calculate how much charge flows
Answer:
16C
Explanation:
since current=CHARGE/TIME
THEREFORE CHARGE=TIME X CURRENT
=2X8
=16C
Jackson ran in a marathon for 3 hours. The marathon was 185 miles long. How fast was the runner running?
Answer:
hgt tdyrghgcderhgfe
Explanation:
rghttyhhhggggftttgf d's weyhvfswertfcdsettyhgftgdfvhgg fee e4y
please answer asap its important
Answer:
It is the green answer.
Explanation:
Please mark brianliest.
Which climate will have better soil for plant growth? warm or cold climate?, and why.
Answer:
Agriculturally suitable lands have adequate precipitation and moderate temperatures as well as good soils. Farmers regularly have to contend with wet and dry events to grow crops, even in hospitable climates.
Explanation:
A basketball rolls down a hill until it comes to a stop in a ditch
A. 1st Law of motion
B. 2nd Law of motion
C. 3rd Law of motion
Answer:
1st law.
Explanation:
A 1200kg car traveling at 45m/s slams on its breaks and slides to a stop. If the coefficient of kinetic friction between the car and the road is 0.85 determine how far the car slides
Given :
A 1200 kg car travelling at 45 m/s slams on its breaks and slides to a stop.
If the coefficient of kinetic friction between the car and the road is 0.85 .
To Find :
How far the car slides.
Solution :
Acceleration is given by :
[tex]ma = \mu_kmg\\\\a = \mu_kg\\\\a = 0.85\times 10\ m/s^2\\\\a = 8.5\ m/s^2[/tex]
Distance covered is :
[tex]2as=u^2-v^2\\\\s = \dfrac{u^2-v^2}{2a}\\\\s=\dfrac{45^2-0^2}{2\times 8.5}\\\\s=119.12\ m[/tex]
Therefore, distance covered is 119.12 m.
Hence, this is the required solution.
express the relation between m2 , cm2 , mm2 and km2
Answer:
1 Square meter (m2) is equal to 10000 square centimeters (cm2). To convert square meters to square cm, multiply the square meter value by 10000.
Explanation: