Answer:
Electricity comes from power generation plants (some homes have solar cells which produce most of the electricity
Older plants use coal and gas as fuels for power generation (if you see a train go thru with 100 or so cars loaded with coal, that may be from Wyoming and going to a coal fired plant)
Wind farms are becoming more plentiful and produce some portion of the electricity generated
Solar cell farms are also used to produce a small portion of electricity
Heat pumps can use geothermal sources (heat from the ground)
Wave motion of water can also be used to produce electricity
A turtle swimming in a straight line toward shore has a speed of 0.50 m/sec. After 4.0 seconds, its speed is at 0.90 m/sec. What is the turtle's acceleration?
Answer:
0.1m/s²
Explanation:
Using the equation of motion
V = u+at
V is the final speed = 0.9m/s
Initial speed u = 0.5m/s
Time = 4secs
Get the acceleration
0.9 = 0 5+4a
0.9-0.5 = 4a
0.4 = 4a
a = 0.4/4
a = 0.1m/s²
Hence the acceleration is 0.1m/s²
Which indicates that light travels in straight lines?
A. Color
B. Pigments
C. Shadows
D. Waves
Answer:
A
Explanation:
Answer:
C
Explanation:
Light travels in straight lines
Shadows are evidence of light travelling in straight lines. An object blocks light so that it can't reach the surface where we see the shadow.
Which of the following is produced as a result of photosynthesis
A. Water
B. Heat
C. Oxygen
D. Carbon dioxide
Answer:
The actual answer would be c, oxygen.
Explanation:
Plants need the energy glucose provides in order to grow and reproduce. Glucose is also required for the process of cellular respiration, in which plants convert carbon dioxide from the air into oxygen.
31. If Earth's mass was cut in half, your weight
would
Answer:
it would decrease to one half your original weight
Explanation:
What is the first law of gravity??
Answer:
every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
Explanation:
HURRY PLEASE HELP ME
Which of the following is an incorrect statement?
A pencil on a table contains potential energy.
Potential energy does work.
All objects contain potential energy.
Potential energy is stored energy.
Answer:
I think it is Potential energy is stored energy
Explanation:
Answer:
potential energy is stored energy, to my knowledge
Chris walks 25 m in the positive direction on a number line, then turns around and walks 15 m in the opposite direction. What is the magnitude of the displacement of Chris?
A. -10 m
B. 40 m
C. 10 m
Answer:
[tex] |d| = |(25 - 15)| \\ |d| = 10 \: m[/tex]
The part of a standing wave where there is complete destructive interference is known as a(n)
node
antinode
crest
trough
In an electric header 500w is written. What is its meaning
Answer:
Because it's wattage is 500W.
Explanation:
This is its mearurement
A 3kg object moving at 4 m/s encounters a 20 N resistive force over a duration of 0.20 seconds. The impulse experienced by this object is _____
Answer:
the impulse experienced by this object is 4 Ns
Explanation:
Given;
mass of the object, m = 3 kg
velocity of the object, v = 4 m/s
resistive force, F = 20 N
duration of impact, t = 0.2 s
The impulse experienced by this object is calculated as follows;
J = F x t
J = 20 x 0.2
J = 4 Ns
Therefore, the impulse experienced by this object is 4 Ns
What is the highest Mountain, and where is it?
Answer:
Mount Everest is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas. The China–Nepal border runs across its summit point. Its elevation of 8,848.86 m was most recently established in 2020 by the Nepali and Chinese authorities.
Explanation:
Please Its urgent I need your HELP!!!!!!!!!!!!!!!!!!!!!!!
Raising the temperature results in the radiator giving off photons of high-energy ultraviolet light. As heat is added, the radiator emits photons across a wide range of visible-light frequencies
how much force is required to accelerate a 12 kg mass at m 5 m/s
Answer:
60N
Explanation:
force = mass * acceleration
force = 12 * 5
force =60N
any tips for an ollie ?
Answer:
skateboard mid-ollie is being actively steered. This is exactly what makes doing an ollie so hard. It's not enough to get the skateboard up into the air - you also have to steer it while it's in the air. You should keep your hands up in the hair a bit to help with balance, scrunch your legs a bit down to have a proper and effective jump. wear nee pads incase you dont fix the landing. Practice jumping on ur skate board tho, if u jump at it without knowing much youll just get hurt.
Explanation:
Using a horizontal force of 60 N, a wagon is pushed horizontally across the floor a distance of 12 meters at a constant speed of 2.3 m/s
a) What is the work done by the force?
b) What is the power supplied by the force?
Answer:
a) The work done by the force is 720 joules, b) The power supplied by the force is 138 watts.
Explanation:
a) Since force is uniform and parallel to the direction of motion, the work ([tex]W[/tex]), in joules, done by the force ([tex]F[/tex]), in newtons, is defined by this formula:
[tex]W = F\cdot s[/tex] (1)
Where [tex]s[/tex] is the travelled distance, in meters.
If we know that [tex]F = 60\,N[/tex] and [tex]s = 12\,m[/tex], then the work done by the force is:
[tex]W = F\cdot s[/tex]
[tex]W = (60\,N)\cdot (12\,m)[/tex]
[tex]W = 720\,J[/tex]
The work done by the force is 720 joules.
b) And an expression for the power supplied by the force ([tex]\dot W[/tex]), in watts, is concieved by differentiating (1) in time:
[tex]\dot W = F\cdot \dot s[/tex]
Where [tex]\dot s[/tex] is the speed of the wagon, in meters per second.
If we know that [tex]F = 60\,N[/tex] and [tex]\dot s = 2.3\,\frac{m}{s}[/tex], then the power supplied by the force is:
[tex]\dot W = F\cdot \dot s[/tex]
[tex]\dot W = (60\,N)\cdot \left(2.3\,\frac{m}{s} \right)[/tex]
[tex]\dot W = 138\,W[/tex]
The power supplied by the force is 138 watts.
Round the following off to required number of significant figures.
137 (2 significant figures)
Answer:
140
hope this helps
have a good day :)
Explanation:
Consider 2 steel rods, A and B, B has three times the area and twice the length of A, so young modulus of B will be what factor times young modulus of A?
Answer:
[tex]\frac{Y}{Y_o}[/tex] = 2/3
Explanation:
The yuong modulus of a rod is defined as the relationship between the tensile strength and the strain
Y = [tex]\frac{ \frac{F}{A} }{\frac{\Delta L}{L_o} }[/tex]
let's use the subscript "o" for rod A
I = [tex]\frac{ \frac{F}{A_o} }{ \frac{\Delta L}{L_o} }[/tex]
tells us that rod B has
A = 3 A₀
L = 2 L₀
we substitute
Y = [tex]\frac{ \frac{F}{A} }{ \frac{\Delta L}{L} }[/tex]
Y = [tex]\frac{ \frac{F}{3A_o} }{ \frac{\Delta L}{ 2L_o} }[/tex]
y = ⅔ [tex]\frac{ \frac{F}{A_o}}{ \frac{\Delta }{L_o} }[/tex]
substituting the value of Y₀
Y = ⅔ Y₀
[tex]\frac{Y}{Y_o}[/tex] = 2/3
What is another name for constructive interference?
A. Up
B. Down
C. Reinforcement
D. Cancellation
Calculate the momentum of a 6 kg rock that is rolling down a hill with a velocity of 4 m/s.
Answer:
24kgm/s
Explanation:
momentum(p)=mass×velocity
=6×4
=24 kgm/s
Pls help me!!!!!!!!!!!!!!!!!
Answer:they are a renewable source
Explanation: because they come from the ocean and the ocean is 75% of the world so there will always be waves.
You look down at your phone GPS and it tells you the local park is 2 miles away. This is not a straight path and you will need to make a few turns to get there. The path you take to the park describes your ________ from the park
Answer:
Distance.[tex] \infty \infty [/tex]
Answer:
Distance
Explanation:
Because each path you take will have a different distance. Each path will be different, leading to a different distance. Hope this helped :D
Do planets revolve slower or faster the closer they are from the sun?
Answer:
The speed at which a planet orbits the Sun changes depending upon how far it is from the Sun. When a planet is closer to the Sun the Sun’s gravitational pull is stronger, so the planet moves faster. When a planet is further away from the sun the Sun’s gravitational pull is weaker, so the planet moves slower in its orbit.
Write an essay about the things an individual must do in order to adapt and survive the changes that are happening in his/her environment.
The Sun emits a solar flare directly aimed at Earth. Which instrument on an orbiting satellite would detect the flare first?
Answer:
X-ray Telescope
Explanation:
X-ray Telescope which can be either hard or soft is an instrument on an orbiting satellite that would detect the flare first.
This is because X-ray Telescope is technically designed to detect and determine X-rays or radio and optical emissions from flares, from places or points beyond Earth's atmosphere.
Which is closest to the Earth?
A. Moon
B. Sun
C. Mars
D. Venus
Answer:
A. Moon
Explanation:
The Moon is hundreds of thousands of miles away from the Earth while the other options are hundreds of millions of miles away.
describe how a wheel and axle work?
A weally works when you pull something and a axle is something that you can push
Explanation:
I hope this helps
According to Hooke's law, the force exerted by a compressed or stretched spring is proportional to...
Answer:
Hooke's law can be written as:
F = -k*Δx
Where k is a constant that depends on the spring, called the spring constant.
And Δx = (x - x₀) is the displacement of the spring with respect to the rest position x₀
And a proportional equation is something like:
y = c*x
Where c is a constant of proportionality.
In the case of Hooke's law, the constant is K, then the force is proportional to the displacement of the spring with respect to the rest position Δx.
How many electrons must be remowel from an electricaly Nurutral Silvor Coin to five it a charge of 3.2 NC ?
Answer:
#_electrons = 2 10¹⁰ electrons
Explanation:
For this exercise we can use a direct rule of three proportions rule. If an electron has a charge of 1.6 10⁻¹⁹ C how many electrons have a charge of 3.2 10⁻⁹ C
#_electrons = 3.2 10⁻⁹ ( [tex]\frac{1}{1.6 \ 10^{-19}}[/tex])
#_electrons = 2 10¹⁰ electrons
what is shot-curciting
Answer:
A path that allows most of the current in an electric circuit to flow around or away from the principal elements or devices in the circuit.
The distance between 4 nodes (3 sections, 2 sections= wavelength) is 15.0cm. The frequency of the source is 10Hz. What's the speed of the waves in cm/s?
Answer:
the speed of the waves is 150 cm/s
Explanation:
Given;
frequency of the wave, f = 10 Hz = 10
distance between 4 nodes, L = 15.0 cm
The wavelength (λ) of the wave is calculated as follows;
Node to Node = λ/2
L = 2(Node to Node) = (4 Nodes) = 2 (λ/2) = λ
Thus, λ = L = 15.0 cm
The speed (v) of the wave is calculated as follows;
v = fλ
v = 10 Hz x 15.0 cm
v = 150 cm/s
Therefore, the speed of the waves is 150 cm/s