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 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
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.
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
31. If Earth's mass was cut in half, your weight
would
Answer:
it would decrease to one half your original weight
Explanation:
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.
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
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.
In an electric header 500w is written. What is its meaning
Answer:
Because it's wattage is 500W.
Explanation:
This is its mearurement
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
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.
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.
The heat current across a certain cinductive material is H. If the cross-sectional area of the material is tripled and everything else remains the same, how is the heat current affected?
Answer:
Resistance is inversely proportional to the cross section area of the material, hence when cross sectional area is tripled, also resistance triples.
Since heat is caused due to resistance, also heat current triples.
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.
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 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:
The part of a standing wave where there is complete destructive interference is known as a(n)
node
antinode
crest
trough
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.
1. A massive object can distort the light of more distant objects behind it through the phenomenon that we call ________. 2. ________ are defined as subatomic particles that have more mass than neutrinos but do not interact with light. 3. The _____________ of spiral galaxies provide strong evidence for the existence of dark matter. 4. Models show that the _________ of the universe is better-explained when we include the effects of dark matter along with the effects of luminous matter.
Answer:
1. Gravitational lensing.
2. Weakly interacting massive particles (WIMPs).
3. Rotation curves.
4. Large-scale structure.
Explanation:
In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.
Generally, matter exists in three (3) distinct or classical phases and these are; solid, liquid and gas.
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
The following statements are matched to give the characteristics of matter with respect to light;
1. A massive object can distort the light of more distant objects behind it through the phenomenon that we call: gravitational lensing. The gravitational field distorts and magnifies light from a distant galaxy such as quasars.
2. Weakly interacting massive particles (WIMPs): are defined as subatomic particles that have more mass than neutrinos but do not interact with light.
3. The rotation curves of spiral galaxies provide strong evidence for the existence of dark matter.
4. Models show that the large-scale structure of the universe is better-explained when we include the effects of dark matter along with the effects of luminous matter.
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
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:
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
Round the following off to required number of significant figures.
137 (2 significant figures)
Answer:
140
hope this helps
have a good day :)
Explanation:
What protects and supports body organs and provides a framework the muscles use to support movements,made up of bones and joints
Answer: Skeletal system
Explanation:
The skeletal system is a framework of the body. It comprises of connective tissues like bones, tendons, ligaments, and cartilage. All these connective tissues of the skeletal system connect with the muscular system of the body this helps in the locomotion of the body. The conjugation of the musculoskeletal system will also protect the internal organs of the body and will prevent the internal organs from injuries.
Answer:
the skeletal system
Explanation:
Because our skeleton is the framework of the body. :)
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.
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
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.
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
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
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: