Answer:
Kevin must have used simple random sampling.
Explanation:
We can say that Kevin used simple random sampling. This is because this type of sampling allows elements to be taken from a population in a completely random way, to form a sample. In this case, each element, or individual, as shown in the question above, has the same probability of being selected to compose the sample, since this selection is completely random.
A car is traveling at 30 m/s and about to impact a wall. What change would result in the safest outcome
Answer:
Hitting the brakes
I guess....
Answer:
if he hits the brakes before it hits the wall then the safest outcome will be that he and his car will be safe.
if the car travels thrice(3times) around the track,who much is the total distance covered?
What are the units for momentum?
Kg
Newtons
m/s
kg·m/s
Answer:
kg·m/s
Explanation:
Answer: kg·m/s
Explanation:
The SI unit for momentum is kg•m/s
Momentum=mass x velocity
Unit for mass=kg
Unit for velocity=m/s
Therefore the unit for momentum is kg•m/s
Two sound waves (speed 343 m/s) have different wavelengths. The first has a wavelength of 5.72 m, and the second a wavelength of 11.44 m. What beat frequency do you hear from these two waves?
Answer:
The beat frequency is 30 Hz
Explanation:
Given;
velocity of the two sound waves, v = 343 m/s
wavelength of the first wave, λ₁ = 5.72 m
wavelength of the second wave, λ₂ = 11.44 m
The frequency of the first wave is calculated as follows;
F₁ = v/λ₁
F₁ = 343 / 5.72
F₁ = 59.97 HZ
The frequency of the second wave is calculated as follows;
F₂ = v/λ₂
F₂ = 343 / 11.44
F₂ = 29.98 Hz
The beat frequency is calculated as;
Fb = F₁ - F₂
Fb = 59.97 HZ - 29.98 Hz
Fb = 30 Hz
find the resultant resistance of the circuit
Answer:
R = 1.71 ohms
Explanation:
Two resistors are connected in parallel. There equivalent resistance is given by :
[tex]\dfrac{1}{R}=\dfrac{1}{R_1}+\dfrac{1}{R_2}[/tex]
Put all the values,
[tex]\dfrac{1}{R}=\dfrac{1}{3}+\dfrac{1}{4}\\\\R=1.71\ \Omega[/tex]
So, the resultant resistance of the circuit is equal to 1.71 ohms.
which of the following is a way that science and the economy interact
Answer: (A) Science is often used to make new technology that people can sell.
Explanation:
Scientific discoveries serve as a basis for industrial developments of new technologies. That development is very often driven by economical considerations. Viable, well-developed, well-implemented solutions sell.
The history of industrialized world is one treasure trove of examples of (A) (think of your iPhone X selling for $1000 a pop)
Explanation:
A student with a mass of 62.0 kg walks up a flight of stairs with a height of 3.40 meters. If it takes him 7.00 seconds to get to the top, how much power did he generate?
Answer:
Power generate by generator = 265 W (Approx.)
Explanation:
Given:
Mass of student = 62 kg
Height of stairs = 3.4 meter
Time taken = 7 second
Find:
Power generate by generator
Computation:
Power = Force x [Distance / Time]
Power = [Mass x gravitational acceleration] x [Distance / Time]
Power = [62 x 9.8][3.4/7]
Power = [607.6][3.4/7]
Power = 265.12
Power generate by generator = 265.12
Power generate by generator = 265 W (Approx.)
What is coring. In science
Answer:
Coring is a defect in an alloy (e.g., a copper nickel alloy) that occurs when a heated alloy is cooled too fast for diffusion to occur.
Explanation:
How do an object's mass and the forces acting upon an object affect its motion?
Answer:
Acceleration. When an external force acts on an object, the change in the object's motion will be directly related to its mass. This change in motion, known as acceleration, depends upon the object's mass and the strength of the external force.
What are three reasons why nebulae contribute more to stellar formation than other regions of the universe?
Answer:
Nebulae contribute more to stellar formation than other regions because:
Explanation:
A.They have an unlimited supply of hydrogen.
B. They are believed to be rich in hydrogen and helium.
C. They have a three strong gravitational pull.
This are the reasons that Nebulae contribute more to stellar formation than other regions.
What are the major components of a truss bridge?
Answer:
In a truss bridge, two long - usually straight members known as chords - form the top and bottom; they are connected by a web of vertical posts and diagonals. The bridge is supported at the ends by abutments and sometimes in the middle by piers.
Explanation:
Hope it helps mark as brainliest pls
:)
(4) 10 m/s
13. An object, travelling along a straight path, covers 35 m distance in 4 seconds. In next 6
seconds, it covers 50 m distance. What is the average speed of the object?
(1) 3.5 m/s
(2) 4.5 m/s
(3) 7.5 m/s
(4) 8.5 m/s
14. A taxi driver noted reading on the odometer fitted in
Answer:
13
Explanation:
6+4=10s
50+35=85
av speed=85/10=8.5m/s
A CD player spins at 8590rpm. If it starts from rest and has an acceleration of 450rad/s² how long does it take to reach full speed?
Answer:
ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|
An engine has an imput of 100 j and gives out 27 j of useful kenetic energy what is the efficiency of the engine
Answer:
Based on what we have learned so far, in what ways have the experiences of Asian-Canadians stayed the same over time? Why do you think these similarities exist? Please give specific examples to support your ideas.
Explanation:
Oo8. The diagram below models Mercury and Venus orbiting the sun.
Orbits of Mercury and Venus
Sun
Venus
Mercury
What forces causes Venus to travel along a curved path Instead of moving in a straight line as indicated by the dashed
line in the diagram
Answer: it is B
gravitational attraction between the sun and Venus
Explanation:
A weightlifter is lifting a load of 60 kg to a height, h. If the energy used to lift the load is 1020 J, what is h?
Answer:
P.E=mgh 1020=60×10h 1020=600h 1.7kg
Un objeto de 200 gramos está amarrado del extremo de una cuerda y gira describiendo un círculo horizontal de 1.20 m de radio a razón de 3 rev/seg la tensión en la cuerda es?
Answer:
La tensión es 85.3 N.
Explanation:
Cuando el objeto gira en dirección horizontal, la sumatoria de fuerzas se puede calcular usando la segunda ley de Newton:
[tex] \Sigma F_{x} =ma_{c} [/tex]
[tex] T = ma_{c} [/tex]
Dado que el movimiento es horizontal, el peso (que está en el eje y) no contribuye en la sumatoria de fuerzas en el eje x. Por lo que la única fuerza actuando sobre el objeto en la dirección del movimiento es la tensión.
En donde:
m: es la masa del objeto = 200 g = 0.200 kg
[tex]a_{c}[/tex]: es la aceleración centrípeta
La aceleración centrípeta viene dada por:
[tex]a_{c} = \omega^{2} r[/tex]
En donde:
ω: es la velocidad angular del objeto = 3 rev/s
r: es el radio = 1.20 m
Entonces, la tensión es:
[tex]T = m\omega^{2} r = 0.200 kg(3\frac{rev}{s}*\frac{2\pi rad}{1 rev})^{2}*1.20 m = 85.3 N[/tex]
Por lo tanto, la tensión es 85.3 N.
Espero que te sea de utilidad!
If the speed of the wave along the rope is 3.2 m/s. Calculate the frequency of the wave
Answer:
2Hz
Explanation:
Find the diagram attached
Using the formula;
v = fλ
v is the velocity
f is the frequency
λ is the wavelength
Given the following
v = 3.2m/s
λ = 4.8/3 = 1.6m
Get the frequency
f = v/λ
f = 3.2/1.6
f = 2Hertz
Hence the frequency of the wave is 2Hz
The frequency of the wave is equal to 2.0 Hertz.
Given the following data:
Speed of wave = 3.2 m/s. Distance = 4.8 meters.To calculate the frequency of the wave:
How to calculate frequency.First of all, we would determine the wavelength of the wave in the image attached below:
Note: Wavelength is the successive distance between two (2) crests.
[tex]Wavelength = \frac{distance}{3} \\\\Wavelength = \frac{4.8}{3}[/tex]
Wavelength = 1.6 meter.
Mathematically, frequency is given by this formula:
[tex]Frequency = \frac{velocity}{wavelength} \\\\[/tex]
Substituting the given parameters into the formula, we have;
[tex]Frequency = \frac{3.2}{1.6}[/tex]
Frequency = 2.0 Hertz.
Read more on frequency here: https://brainly.com/question/25699025
The moon orbits the earth once every 27 days at a distance of 384400 km. The international space station orbits the earth at an altitude of 400km. Determine the period of orbit of the space station
Answer:
ive never done this befor but i think its 36 times aroud earth a day
Explanation:
384400/400=961
961% of 27 days is 40minuets
1440/40=36
Bruce has a momentum of 430kg m/s and is running at 7.8m/s. What is Bruce's mass?
Answer:
55.128kg
Explanation:
P= m×v
or, m=P/v = 430/7.8 = 55.128 kg
Answer:
55.13 kg
Explanation:
Momentum, P = m*v
P = m*v
m = P/v
m = 430/7.8
m = 55.13 kg
What kind of proof is required when disproving old ideas?
A.
Experimental evidence that supports the new idea
B.
Survey results that show popular support for the new idea
C.
Peer review that does not support the new idea
D.
A well-stated hypothesis that shows the new idea can be tested
Experimental evidence that supports the new idea
Justify that the given graph is a distance-time graph of an object at rest. (1)
2. Suppose you are going for a trip and you boarded a bus. The bus driver asked you to wear safety
belts. Will you agree with the driver and wear safety belts? Justify your answer in the light of
Newton's first law of motion. (2)
3. An object moving with a velocity of 36 km/hr changes its velocity to 72 km/hr in 20 seconds.
Find the distance travelled by the object during this time interval using only one equation of
motion
Answer:
Explanation:
Yes i will agree with the driver and wear safety belts because according to the newtons first law of motion it states that " every body continues to be in its state of rest or uniform motion in a straight line unless it is compledd by some external effort to change that state".So according to this if a bus moves our body also moves beacuse effort is applied when in the moving bus.
acceleration=final velocity - initial velocity/time taken
=(20-10 )/20
=10/20
=0.5 m/s
Una viga de acero tiene 5 m de largo a una temperatura de 20 c en un dia caluroso, la temperatura se eleva a 40 c ¿cual es el cambio en la longitud de la viga debido a la expansión térmica?
Answer:
ΔL = 1.2 10⁻³ m
Explanation:
The expression for thermal expansion is
ΔL = α L₀ ΔT
in this case it indicates that the length is L₀ = 5 m for T₀ = 20C the final temperature is T_f = 40 C
the table shows the value of thermal expansion for steel α = 12 10⁻⁶ C⁻¹
let's calculate
ΔL = 12 10⁻⁶ 5 (40 -20)
ΔL = 1.2 10⁻³ m
37. A baseball is pitched at a speed of 40 m/s. How long does it take the ball to travel 27
meters from the pitcher's mound to home plate?
Answer:
0.675
Explanation:
hope you get it right
Answer:
[tex]0.675\:\mathrm{s}[/tex]
Explanation:
Displacement can be given as [tex]\Delta x=v_x\cdot t[/tex]
Substituting given values, we have:
[tex]27=40t,\\t=\frac{27}{40}=\boxed{0.675\:\mathrm{s}}[/tex]
The angular velocity of a flywheel obeys the equa tion w(1) A Br2, where t is in seconds and A and B are con stants having numerical values 2.75 (for A) and 1.50 (for B). (a) What are the units of A and B if w, is in rad/s
Answer:
[tex]A \to rad/s[/tex]
[tex]B \to rad/s^3[/tex]
Explanation:
[tex]\omega_z(t)=A + Bt^2[/tex]
Required
The units of A and B
From the question, we understand that:
[tex]\omega_z(t) \to rad/s[/tex]
This implies that each of [tex]A[/tex] and [tex]Bt^2[/tex] will have the same unit as [tex]\omega_z(t)[/tex]
So, we have:
[tex]A \to rad/s[/tex]
[tex]Bt^2 \to rad/s[/tex]
The unit of t is (s); So, the expression becomes
[tex]B * s^2 \to rad/s[/tex]
Divide both sides by [tex]s^2[/tex]
[tex]B \to \frac{rad/s}{s^2}[/tex]
[tex]B \to rad/s^3[/tex]
why colour of sky appear blue ¯\_(ツ)_/¯
Explanation:
During the day the sky looks blue because it's the blue light that gets scattered the most. It's redirected into many different directions all over the sky, whereas the other wavelengths aren't scattered as much. Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time. White light is composed of seven light and among them, blue light scatters the most as the wavelength of the blue light is comparable to the size of particles in the atmosphere. So, the sky appears blue. Hence, the sky appears blue because the fine particles in the atmosphere scatter light of shorter wavelengths! :D
1.Under normal atmospheric pressure what temperature does:
i.Ice turn to water?
ii.water turn to steam?
2.In which order do the following take place during water purification?
a)chlorination b)screening c)filtration d)sedimentation
b.Which of these processes ensures that the water contains no harmful microorganisms
Answer:
1.i)heat
ii.)heat
2.a.)b,c,d,a
b.)a.chlorination
Answer:
B
Explanation:
B
PLEASE HELP!!! I have an electromagnet. If I detach the two wires from the battery and reattach them to the opposite terminals, how would that change the current and magnetic field?
Explanation:
hope it helps thanks
pls mark me as brainliest
3. What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?
Explanation:
everything can be found in the picture
5 aplicaciones de la fuerza en tu vida cotidiana
Answer:
La fuerza es la causa que provoca cualquier cambio en el movimiento o la geometría de los cuerpos. Un cuerpo puede aceptar muchas fuerzas al mismo tiempo, cuyo resultado será en cada punto una fuerza recomendada y un par recomendado. Cuando estas fuerzas se neutralizan entre sí, se dice que el cuerpo está en un estado de equilibrio.
En lo que respecta a los cuerpos libres, la fuerza es generalmente la causa de un cambio en su estado cinético, es decir, que los acelera o ralentiza. Esto también se aplica a su rotación, que puede acelerarse o desacelerarse. Para los cuerpos que no son libres de moverse en todas las formas, es decir, aquellos que están suspendidos en algún lugar y solo pueden moverse alrededor de un punto o eje o en una trayectoria predeterminada, así como aquellos que aplican fuerzas de fricción o reacciones generales de apoyo, nosotros reducir las fuerzas en puntos característicos. En el caso de los cuerpos no libres, la fuerza es la causa que provoca su movimiento o movilidad en relación con sus puntos de apoyo o conexión, o la que provoca su intenso estado, presión o deformación. La inercia de un cuerpo libre también permite que el cuerpo se someta a una tensión, presión o deformación intensas cuando se le aplican las fuerzas correspondientes.