Which diagram best illustrates what happens when electromagnetic waves strike a reflective material?
Answer:
The second diagram does that
The last diagram below represents what happenes when electromagnetic waves strike a reflective material. The last diagram is showed in the image below.
please help answer brainlest
each rock you need to tell where OK can you find them
like: your backyard or the road
Flakes of brick
Cracks in rocks
Lichen growing on rocks
Roots or plant growth making cracks in concrete
Worn away statues
Exposed rocks
Rust on rocks
Example You Found:
Answer:
Flakes of brick: Athens, Ohio
Cracks in rocks: Sandston, Mudcracks
Lichen growing on rocks: Antarctica living below the surface
Roots or plant growth making cracks in concrete: In the driveway, sidewalk, or road.
An astronaut and his space suit have a combined mass of 157 kg. The
astronaut is using a 5 kg tqol kit to repair a solar panel on the International
Space Station. When the têther connecting the astronaut to the space
station becomes unattached, the astronaut, still holding the tool kit, starts
to float away at 0.2 m/s. Calculate the velocity with which the astronaut
must throw the tool kit in order to float back toward the space station at
0.1 m/s. Show your calculations and include units in your answer.
*
Answer:
v₃ = 9.62[m/s]
Explanation:
To solve this type of problem we must use the principle of conservation of linear momentum, which tells us that the momentum is equal to the product of mass by velocity.
We must analyze the moment when the astronaut launches the toolkit, the before and after. In order to return to the ship, the astronaut must launch the toolkit in the opposite direction to the movement.
Let's take the leftward movement as negative, which is when the astronaut moves away from the ship, and rightward as positive, which is when he approaches the ship.
In this way, we can construct the following equation.
[tex]-(m_{1}+m_{2})*v_{1}=(m_{1}*v_{2})-(m_{2}*v_{3})[/tex]
where:
m₁ = mass of the astronaut = 157 [kg]
m₂ = mass of the toolkit = 5 [kg]
v₁ = velocity combined of the astronaut and the toolkit before throwing the toolkit = 0.2 [m/s]
v₂ = velocity for returning back to the ship after throwing the toolkit [m/s]
v₃ = velocity at which the toolkit should be thrown [m/s]
Now replacing:
[tex]-(157+5)*0.2=(157*0.1)-(5*v_{3})\\(5*v_{3})= 15.7+32.4\\v_{3}=9.62[m/s][/tex]
The velocity with which the astronaut must throw the tool kit is 9.62 m/s.
The given parameters:
Mass of the astronaut and space suit, m₁ = 157 kgMass of the tool kit, m₂ = 5 kgVelocity of the astronaut and tool kit, v = 0.2 m/sVelocity of the astronaut and space station, u₁ = -0.1 m/sApply the principle of conservation of linear momentum to determine the velocity of the tool kit;
[tex]m_1 u_1 + m_2u_2 = v(m_1 + m_2)\\\\-0.1(157) \ + 5u_2 = 0.2(157 + 5) \\\\-15.7 + 5u_2 = 32.4\\\\5u_2 = 32.4 + 15.7\\\\5u_2 = 48.1\\\\u_2 = \frac{48.1}{5} \\\\u_2 = 9.62 \ m/s[/tex]
Thus, the velocity with which the astronaut must throw the tool kit is 9.62 m/s.
Learn more about conservation of linear momentum here: https://brainly.com/question/7538238
If an object accelerates from rest, with a constant of 8 m/s2, what will its velocity be after 35s?
Answer:
Its speed will be 280 m/s
Explanation:
Constant Acceleration Motion
It's a type of motion in which the speed of an object changes by an equal amount in every equal period of time.
If a is the constant acceleration, vo the initial speed, vf the final speed, and t the time, vf can be calculated as:
[tex]v_f=v_o+at[/tex]
The object accelerates from rest (vo=0) at a constant acceleration of [tex]a=8\ m/s^2[/tex]. The final speed at t=35 seconds is:
[tex]v_f=0+8*35[/tex]
[tex]v_f=280\ m/s[/tex]
Its speed will be 280 m/s
Which of the following is a personal decision that involves science?
A. Will vitamins help me sleep better?
B. Is it fun to ride a train across the country? C. Should I live in an apartment or a house?
D. Are black or white laptops better looking?
how is this please help me
Answer:
jsjsjsjsmkskskskksksks
What is the direction of the centripetal force when applied to an object?
Answer:
It would move in a line tangent to the circular path
Explanation:
A plane is traveling at a velocity of 90 m/s. It accelerates at a constant rate of 1.5 m/s2 until its velocity reaches 500 m/s. What distance did the plane cover while it was accelerating?
Answer:
The distance the plane covered while it was accelerating is 80,633.3 m
Explanation:
Given;
initial velocity of the plane, u = 90 m/s
acceleration of the plane, a = 1.5 m/s²
final velocity of the plane, v = 500 m/s
The distance covered by the plane is given as;
v² = u² + 2ad
where;
d is the distance covered by the plane;
500² = 90² + 2(1.5)d
500² - 90² = 3d
241900 = 3d
d = 241900 / 3
d = 80,633.3 m
Therefore, the distance the plane covered while it was accelerating is 80,633.3 m
Suppose a current flows through a copper wire. Which two things occur?
A. The field is perpendicular to the direction of flow of the current.
B. The field is parallel to the direction of flow of the current.
C. A magnetic field forms around the wire.
D. An electric field forms around the wire.
A magnetic field forms around the wire. and The field is perpendicular to the direction of flow of the current.
What is Magnetic field?
A magnetic field is a visual representation of how the magnetic force is distributed around and inside of magnetic objects.
Most people are at least somewhat familiar with common magnetic items and are aware that there may be forces at work between them.
We are aware that magnets have two poles and that the attraction or repulsion between two magnets depends on how they are oriented (similar poles). We are aware that this occurs in a certain area that surrounds a magnet.
Therefore, A magnetic field forms around the wire. and The field is perpendicular to the direction of flow of the current.
To learn more about magnetic field, refer to the link:
https://brainly.com/question/15719243
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Name all of the steps on the Physical Activity Pyramid?
Answer:
The steps are:-
Moderate physical activityVigorous aerobicsVigorous sport and recreationMuscle fitness exerciseFlexibility exerciseAvoiding inactivityBalancing energyQuestion 2 of 5
This landform is on Mount Callaghan, British Columbia. It
formed as rocks slide down a steep cliff.
What directly led to this landform?
Answer:
Mass wasting
Explanation:
Took the test
Answer:
Mass wasting
Explanation:
because
A cruise started its trip 8:00. its average speed was 100 km/h. when it traveled 2/5 of its journey by 12:00, the boat changed its speed. if the boat was required to arrive at the destination at 17:00 what average speed must the boat travel at for the remaining journey?
Answer:
Explanation:idk
No one falls out during a loop on a
rollercoaster because of _____.
Answer:
Seatbelts
Explanation:
Resistance to change in motion. it presses tour body outside of the loop, keeping you inside the cart
A lamp draws a current of 20 A when it is connected to a 100 V source? What is the resistance of the lamp?
Explanation:
R = V / I = 100V / 20A = 5 ohms.
Photons with the highest energy have the ____
A. strongest positive charge
B. longest period
C. highest amplitude
D. shortest wavelength
Answer:
D. shortest wavelength
Explanation:
Photons with the highest energy have the shortest wavelength. The shorter the wavelength, the higher the energy of a photon.
A photon is a quantity that transmits electromagnetic energy from one place to the other.
Gamma rays have photons that transmits the highest amount of energy. The rays have the shortest wavelength and highest frequency of all electromagnetic radiations.Energy, wavelength and frequency of a photon are connected using the expression:
E = h f = [tex]\frac{hc}{wavelength}[/tex]
E is the energy
h is the Planck's constant
f is the frequency.
How much power does it take to do 1000 J of work in 8 seconds?
A 45kg skater and a 60kg skater are standing still, holding hands on frictionless ice. They push away from each other in opposite directions. If the 45kg skater was measured traveling at 3.5 m/s, how fast was the 60 kg skater traveling?
Answer:
The 60 kg skater is traveling at 2.63 m/s in the opposite direction from the 45 kg skater.
Explanation:
The velocity of the 60 kg skater can be found by conservation of linear momentum:
[tex]P_{i} = P_{f}[/tex]
[tex]m_{a}v_{i_{a}} + m_{b}v_{i_{b}} = m_{a}v_{f_{a}} + m_{b}v_{f_{b}}[/tex] (1)
Where:
[tex]m_{a}[/tex]: is the mass of the first skater = 45 kg
[tex]m_{b}[/tex]: is the mass of the second skater = 60 kg
[tex]v_{i_{a}}[/tex]: is the initial speed of the first skater = 0 (he is standing still)
[tex]v_{i_{b}}[/tex]: is the initial speed of the second skater = 0 (he is standing still)
[tex]v_{f_{a}}[/tex]: is the final speed of the first skater = 3.5 m/s
[tex]v_{f_{b}}[/tex]: is the final speed of the second skater =?
By replacing the above values into equation (1) and solving for [tex]v_{f_{b}}[/tex] we have:
[tex]0 = m_{a}v_{f_{a}} + m_{b}v_{f_{b}}[/tex]
[tex]v_{f_{b}} = \frac{-m_{a}v_{f_{a}}}{m_{b}} = \frac{-45 kg*3.5 m/s}{60 kg} = -2.63 m/s[/tex]
The minus sign is because the 60 kg skater is moving in the opposite direction from the other skater.
Therefore, the 60 kg skater is traveling at 2.63 m/s in the opposite direction from the 45 kg skater.
I hope it helps you!
Please answer:
Galileo, in order to measure the speed of light, performed this simple
experiment: He and his assistant each took a lantern that had a shutter in front of it,
and stood on hilltops one mile apart in the night.
Galileo was to flash his lantern, and the assistant was to open the shutter of his own
lantern as soon as he saw the light from Galileo's lantern. Galileo had planned to
measure the time taken for light to travel from one hill to the other and back, and
calculate the speed of light using the formula, Speed = distance traveled / time
taken But he could not measure the speed of light using this method. What could
have been the reason for this?
A. The distance between the two hills was too much for them to see the light from
the other person's lantern.
B. Light does not travel in straight lines and so the distance traveled by it cannot
be measured.
C. The time taken for the light to travel would have been too little to have been
measured by them.
D. Light does not travel because it is present everywhere, so its 'speed' cannot be
calculated
I asked this question before also please answer
Answer: C. The time taken for the light to travel would have been too little to have been measured by them.
Explanation:
Light travels at a speed of 300,000 km per second which is much too fast for the naked eye to even comprehend. This is why light shinning in a distance is picked up instantaneously by out eyes.
This experiment done by Galileo would therefore be unable to measure the speed of light because the light from either lantern would have traveled too fast for Galileo to be able to measure the time taken.
Pete Zaria applies a 4.0-N force to a 1.0-kg mug of root beer to accelerate it over a distance of 1.0-meter along the countertop. Determine the work done by Pete on the mug and the mug's final kinetic energy and final velocity. PSYW
Answer:
Work done = 4 J
Final Kinetic Energy = 4 J
Explanation:
From the question,
Work done = force × distance
W = F×d................... Equation 1
Given: F = 4.0 N, d = 1.0 meter.
Substitute these values into equation 1
W = 4×1
W = 4 Joules.
Also,
Kenetic Energy = 1/2 × mass × velocity×velocity.
K.E = 1/2(mv²)........... (2).
But,
F = ma
Where F = 4 N, m = 1 kg.
a = 4/1 = 4 m/s².
Using,
v² = u² + 2as............. Equation 3
Where u = 0 m/s, a = 4 m/s², s = 1 m.
Substitute into equation 3
v² = 0² +2×4×1
v² = 8
v = √8 m/s.
Substitutting into equation 2
K.E = 1/2(1)(√8)²
K.E = 1/2(8)
K.E = 4 J.
Hence the work done and the Final Kinetic energy are thesame = 4 J
The work done by the Pete is 4.0 J. And its final velocity and kinetic energy are 2.82 m/s and 3.97 J respectively.
Given data:
The force applied by the Pete Zaria is, F = 4.0 N.
The mass of mud is, m = 1.0 kg.
The distance of the countertop is, s = 1.0 m.
The work by the Pete on the mug is equal to the product of applied force and the distance covered by the mug along the rooftop. Therefore,
W = F × s
W = 4.0 × 1.0
W = 4.0 J
Now, apply the third kinematic equation of motion to obtain the final velocity of the mug as,
[tex]v^{2} = u^{2}+2as[/tex]
Here, a is the magnitude of acceleration and its value is,
F = ma
4.0 = (1.0)a
a = 4.0 m/s²
Now,
[tex]v=\sqrt{0^{2}+(2 \times 4 \times 1)}\\\\v = 2.82 \;\rm m/s[/tex]
Now. the kinetic energy of the mug is calculated as,
[tex]KE = \dfrac{1}{2}mv^{2}\\\\KE = \dfrac{1}{2} \times 1.0 \times 2.82^{2}\\\\KE = 3.97 \;\rm J[/tex]
Thus, we can conclude that the work done by the Pete is 4.0 J. And its final velocity and kinetic energy are 2.82 m/s and 3.97 J respectively.
Learn more about the kinetic energy here:
https://brainly.com/question/17858145
A container of height 30cm has a capacity of 1.5litres. What is the height of similar container of capacity 3m^3.
Answer:
Height = 378 cmExplanation:
see image
Which statement best describes the overall function of the human respiratory system? A. The heart pumps blood containing carbon dioxide into the lungs, where it is absorbed. B. Oxygen is transferred into the blood, which circulates the gas throughout the body. C. Oxygen is taken into the lungs and exchanged for carbon dioxide, which is exhaled. D. Carbon dioxide is taken into the lungs and exchanged for oxygen, which is absorbed.
Answer:
C
Explanation:
During respiration, oxygen diffuses into the lung (carbon dioxide diffuses out), gets into the blood, and is transported around the body. The hemoglobin of the blood distributes the oxygen to the various cells and carbon dioxide from these cells diffuses into the blood. The blood travels back to the lung where the carbon dioxide is exchanged for oxygen once again. The carbon dioxide is eventually exhaled out of the nose.
The correct option is C.
write down local units of mass?
Answer:
Explanation: local unit of mass is kilogram
Dos cargas q1= 5 Milicoulombios y q2 = 6 Milicoulombios, se encuentran separadas 4 cm y sufren una fuerza entre ellas. ¿Cuál será el valor de la fuerza entre ambas cargas? ¿Existirá una fuerza de atracción o de repulsión? ¿Por qué?
Answer:
El valor de la fuerza entre ambas cargas es 168,750,000 N.
Ambas cargas son positivas, por lo que entre ellas existirá una fuerza de repulsión.
Explanation:
Los responsables de todos los fenómenos eléctricos son los electrones, porque pueden escapar de la órbita del átomo y son mucho más ligeros que las otras partículas.
La carga eléctrica es una propiedad física propia de algunas partículas subatómicas que se manifiesta mediante fuerzas de atracción y repulsión entre ellas. La materia cargada eléctricamente es influida por los campos electromagnéticos, siendo a su vez, generadora de ellos.
Entre dos o más cargas aparece una fuerza denominada fuerza eléctrica cuyo módulo depende del valor de las cargas y de la distancia que las separa, mientras que su signo depende del signo de cada carga.
La fuerza entre dos cargas se calcula como:
[tex]F=k*\frac{Q*q}{d^{2} }[/tex]
donde:
F es la fuerza eléctrica de atracción o repulsión y se mide en Newtons (N). Q y q son lo valores de las dos cargas puntuales y se miden en Culombios (C). d es el valor de la distancia que las separa y se mide en metros (m)k es una constante de proporcionalidad llamada constante de la ley de Coulomb. Depende del medio en el que se encuentren las cargas. Para el vacío k es aproximadamente 9·10⁹ N·m²/C² utilizando unidades en el S.I.Siendo 1 millicoulomb [mC] = 0,001 coulomb [C] y 100 cm= 1 m, en este caso sabes:
Q= 5 mC= 0.005 Cq= 6 mC= 0.006 Cd= 4 cm= 0.04 mReemplazando:
[tex]F=9*10^{9}\frac{N*m^{2} }{C^{2} } *\frac{0.005C*0.006C}{(0.04m)^{2} }[/tex]
F= 168,750,000 N
El valor de la fuerza entre ambas cargas es 168,750,000 N.
Las cargas del mismo signo se repelen, mientras que las cargas con diferente signo se atraen. En este caso ambas cargas son positivas, por lo que entre ellas existirá una fuerza de repulsión.
A sled is pushed to right with a force of 200 N. The force of friction opposing that motion is 50 N. a) What is the Net Force on the sled? b) assuming the mass of the sled is 30 kg, use Newton's 2nd Law equation to determine the acceleration. Include units in BOTH of your answers! *
Answer:
Fr = 150 [N]
a = 5 [m/s²]
Explanation:
In order to find the resulting force, we must assume that the thrust force is positive to the right, while the friction force is negative to the left.
[tex]F_{r}=200-50\\F_{r}=150[N][/tex]
Now Newton's Second Law tells us that the sum of the forces or the resulting force is equal to the product of mass by acceleration.
F = m*a
[tex]150 = 30*a\\a=150/30\\a = 5 [m/s^{2} ][/tex]
HELP ASAPP!! WILL TRY TO GIVE BRAINLIEST
What is produced in the nucleolus?
Answer: Image result for What is produced in the nucleolus?
The nucleolus is a region found within the cell nucleus that is concerned with producing and assembling the cell's ribosomes. Following assembly, ribosomes are transported to the cell cytoplasm where they serve as the sites for protein synthesis.
Explanation: hope this helps! PLs mark me as brainliest! Thank you and have a wonderful day/night!
paraffin wax is used to make candles
true or false
Answer:
true
Explanation:
PLS MAKE ME AS BRAINLIST
What is the mathematical relationship between wavelength and velocity? Inverse, horizontal, linear or quadratic? I NEED MAJOR HELP PLZ HELP ME THANK U
Answer: Wavelength is the measure of the length of a complete wave cycle. The velocity of a wave is the distance traveled by a point on the wave. In general, for any wave the relation between Velocity and Wavelength is proportionate. It is expressed through the wave velocity formula.
Explanation: For any given wave, the product of wavelength and frequency gives the velocity. It is mathematically given by wave velocity formula written as-
V=f×λ
Where,
V is the velocity of the wave measure using m/s.
f is the frequency of the wave measured using Hz.
λ is the wavelength of the wave measured using m. Velocity and Wavelength Relation
Amplitude, Frequency, wavelength, and velocity are the characteristic of a wave. For a constant frequency, the wavelength is directly proportional to velocity.
Given by:
V∝λ
Example:
For a constant frequency, If the wavelength is doubled. The velocity of the wave will also double.
For a constant frequency, If the wavelength is made four times. The velocity of the wave will also be increased by four times.
Hope you understood the relation between wavelength and velocity of a wave. I truely hope this helps you out tho! Goodluck!
Explain how to find the acceleration of an object that has one-dimensional horizontal motion.
What is the difference between a vigorous sport and vigorous recreation ?
Answer:
Explanation:El ejercicio vigoroso previene en mayor medida el síndrome metabólico (un conjunto de enfermedades que aumentan el riesgo cardiovascular )
mientras que una reacción vigorosa se produce entre el aluminio y el gas cloro. Como consecuencia de la gran cantidad de energía liberada se producen luz y calor
Which of the four spheres is this pictures/scene?
A) hydrosphere
B) biosphere
C) geosphere
D) atmosphere
Answer:
I Believe the answer is
[tex]D. \: \: atmosphere[/tex]
Explanation:
I hope how this helps!