Answer:
N = 2mg
Explanation:
Assuming the surface is horizontal
The surface must provide enough normal force to prevent the masses from accelerating in the vertical direction.
(a) The normal force exerted by the surface on the bottom block is N1 = 2mg.
Given that,
A block m1 rests on a surface. A second block m2 sits on top of the first block. A horizontal force F applied to the bottom block pulls both blocks at constant velocity. Here m1 = m2 = m.Based on the above information, we can say that the N1 is 2mg.
Learn more: brainly.com/question/17429689
How does the appearance of spiral galaxies vary? *Select the two correct answers.*
A. They vary in how tightly their arms are wound.
B. They vary in the brightness of stars located on their arms.
C. Some are more elongated in shape than others.
D. Some have a band of stars and materials through their middle, but others do not
Answer:
A. And D.
A. They vary in how tightly their arms are wound.
D. Some have a band of stars and materials through their middle, but others do not.
The appearance of spiral galaxies vary in the following ways:
A. They vary in how tightly their arms are wound.
D. Some have a band of stars and materials through their middle, but others do not
Spiral galaxies are the galaxies where the gas clouds and the stars are concentrated in spiral arms.
Examples of spiral galaxies include Milky way, Sunflower Galaxy, Andromeda Galaxy, etc.
It should be noted that spiral galaxies vary in how tightly their arms are wound while some have a band of stars and materials through their middle, but others do not.
Read related link on:
https://brainly.com/question/20785889
A jet airplane is in level flight. The mass of the airplane is m = 8930 kg. The airplane travels at a constant speed around a
circular path of radius R = 8.01 mi and makes one revolution every T = 0.106 h. Given that the lift force acts perpendicularly
upward from the plane defined by the wings, what is the magnitude of the lift force acting on the airplane?
At what angle is the airplane banked?
Answer:
Explanation:
The lift force will have a vertical component equal to the weight of the plane and a horizontal component sufficient to supply the needed centripetal accleration.
R = 8.01 mi = 12891 m
ω = 2π/T = 2π/(0.106(3600)) = 0.016465 rad/s
F = m√(g² + (ω²R)²)
F = 8930√(9.81² + (0.016465²(12891))²)
F = 8930√(9.81² + 3.49²)
F = 92,996.480...
F = 93.0 kN
θ = arctan(3.49/9.81) = 19.6°
a raw egg and a hard boiled egg are rotating about the same axis of rotation with the same initial angular velocity. with the aid of diagram, explain which egg will rotate longer
Answer:
Boiled egg rolls slower than a raw egg , because it has a higher moment of inertia than a raw egg . In order to conserve angular momentum , the angular velocity of the boiled egg decreases.The hard boiled egg moves as if it was one solid unit. The raw egg has a solid shell but various types of fluids inside that can move independently of the shell. When you turn the egg to cause it to spin this rotating or turning force is called a torque. How the boiled egg spins? The rotating force on the shell of the hard boiled egg spins the entire egg –shell and content because the content is solid and moves when the shell moves. This egg easily spins and spins longer than does the raw egg.Explanation:
Hence, Boiled egg spins longer than raw egg.A small heat engine has an energy input of 1,176 joules, and does 201 joules of work. What is the efficiency of the engine? (round your answer to the nearest whole number percent, but leave off the % symbol)
so, if you calculate it is 13.3%, enter your number as 13.
The efficiency of the engine is 17%.
Given the following data:
Energy input = 1,176 JoulesEnergy output = 201 JoulesTo find the efficiency of the engine:
Mathematically, the efficiency of an engine is calculated by using the formula:
[tex]Efficiency = \frac{E_O}{E_I}[/tex] × [tex]100[/tex]
Where:
Eo is the energy output.Ei is the energy input.Substituting the given parameters into the formula, we have;
[tex]Efficiency = \frac{201}{1176}[/tex] × [tex]100[/tex]
[tex]Efficiency = 0.171[/tex] × [tex]100[/tex]
Efficiency = 17%
Therefore, the efficiency of the engine is 17%.
Read more: https://brainly.com/question/22599382
The function of which system is to release energy from food for cells to use and to take oxygen into the blood and to remove carbon dioxide?
Digestive
Circulatory
Respiratory
Excretory
A sphere of radius r =34.5 cm and mass m = 1.80 kg starts from rest and rolls without slipping down a 30.0∘ incline that is 10.0 m long.
A.) calculate its translational speed when it reaches the bottom.
B.) Calculate its rotational speed when it reaches the bottom.
C.) what is the ratio of translational to rotational kinetic energy at the bottom?
Answer:
Explanation:
It depends on the construction of the sphere.
Let's ASSUME it is thin wall sphere with a moment of inertia (2/3)mR²
The Change in potential energy will equal the change in kinetic energy
mgh = ½mv² + ½Iω²
mgh = ½mv² + ½((2/3)mR²)(v/R)²
2gh = v² + 2/3v²
2gh = 5/3v²
v = √((6/5)gh)
v = √((6/5)(9.81)(10.0sin30.0))
A) v = 7.67 m/s
B) ω = 7.67/0.345 = 22.2 radians/s
C) ½mv² / ½Iω² = mv²/Iω² = mv²/((2/3)mR²)(v/R)² = 3/2
Why does the sun have less gravitational pull on planet far away like Pluto?
Answer:
Because the planet is far away from the sun
Explanation:
The closer the planet is to the Sun, the greater the pull of the Sun's gravity, and the faster the planet orbits.
While, over here the Pluto is very far away from the Sun so it will have very little gravitational pull and still keeps revolving around the Sun
Pls Mark BrainliestPLEASE HELPPPPPPPPPPPPP
Answer: sliding
Explanation:
A snow skier slowing to a stop after skiing down a mountain is an example of sliding friction
Answer:
static friction
Explanation:
If a material were being designed to demonstrate no thermal expansions, how would the energy plot look like?
The characteristics of thermal expansion allow finding that the response for a material without thermal expansion is
The length variation is zero In the graph the line is horizontal so there is no change in length with temperature
Thermal expansion is the macroscopic sum of the changes in the length of the bonds when the energy (temperature) changes, it can be written
ΔL = α L₀ ΔT
Where ΔL is the change in length, α the coefficient of linear expansion, L₀ the initial length and ΔT the change in body temperature
In this case, a material is being designed that the thermal expansion is very small, for this the material must be made up of several compounds where some of them present a contraction with temperature, some examples: water at low temperature, liquefied gases , ceramic tile, quartz, etc.
The thermal expansion measurement processes control the body temperature and measure the change in length, in this case the change in length must be zero, in the attachment we can see a graph of a composite material with these characteristics, an example of this type of material is Invar an alloy of nickel and iron α = 3.7 10⁻⁶ ºC⁻¹
In conclusion, using the characteristics of thermal expansion we can find that the response of material without thermal expansion is
The length variation is zero In the graph the line is horizontal so there is no change in length with temperature
Learn more here: brainly.com/question/18717902
PLEASEEEEEE HELPPPPPPP MEEEEEEEE!!!!!!!!!!!!!
Answer:
[tex]2 \\ because \\ 2 - 2 = 0 \\ 5 - 5 = 0[/tex]
A jumbo jet collides with a sparrow. Who exerts the greater force of impact
Answer:
Neither
Explanation:
Forces act in equal magnitudes and opposite directions.
I am completely braindead on how to calculate the time first.
A flowerpot falls from a window sill 31.3m from a sidewalk. What is the velocity of the flowerpot when it hits the ground? (hint: Use d=1/2at^2 to find "t" first, then find velocity using v=at. Remember, ay= -9.8 m/s2).
24.8 m/s
Explanation:
You don't have to solve for time first. You can use the equation below to solve for the velocity before impact:
[tex]v_y^2 = v_{0y}^2 + 2a_yy[/tex]
We know that [tex]v_{0y} = 0[/tex] so the equation above becomes
[tex]v_y^2 = 2a_yy \Rightarrow v_y = \sqrt{-2a_yy}[/tex]
Plugging in the numbers, we get
[tex]v_y = \sqrt{-2(-9.8\:\text{m/s}^2)(31.3\:\text{m})}[/tex]
[tex]\:\:\:\:\:=24.8\:\text{m/s}[/tex]
METHOD 2:
If you insist on using that equation for d, we can do that too. So solving for t from the equation for d. we get
[tex]t = \sqrt{\dfrac{2d}{g}} = \sqrt{\dfrac{2(31.3\:\text{m})}{9.8\:\text{m/s}^2}}[/tex]
[tex]\:\:\:\:= 2.53\:\text{s}[/tex]
So using the equation [tex]v_y = gt,[/tex] we get
[tex]v_y = (9.8\:\text{m/s}^2)(2.53\:\text{s}) = 24.8\:\text{m/s}[/tex]
So you get the same result regardless of the method you use.
5. Sarah is standing 32.0 m away from Jason. If Sarah throws a snowball at a 45 degree
angle for maximum distance, what velocity must the snowball have to hit Jason directly.
(Assume Jason and Sarah are about the same height so that if she throws the snowball
from head level, it will hit Jason in the head.)
Answer:
Explanation:
If air resistance is ignored and assume UP and Toward Jason are the positive directions.
horizontal analysis
d = (vx₀)t
t = d/vx₀
horizontal analysis
0 = vy₀t + ½gt²
0 = vy₀(d/vx₀)+ ½g(d/vx₀)²
as vy₀ = v₀sin45 and vx₀ = v₀cos45 and are equal.
0 = d + ½g(d²/v₀²cos²45)
-d = ½g(d²/v₀²cos²45)
-dv₀² = ½g(d²/cos²45)
v₀² = -½g(d/cos²45)
v₀² = -½(-9.81(32.0/cos²45)
v₀² = 313.92
v₀ = 17.717787...
v₀ = 17.7 m/s
Why are earth, other solar system planets, and most planetary objects spherical
Answer:
A planet is round becuase of gravity
Explanation:
A planet's gravity pulls equally from all sides, gravity pulls from the center to the edge like the spokes of a bicycle wheel. This makes the overall shape of a planet sphere, which is a three-dimensional circle.
the velocity of an object must include these two things ________ and _________
will give brainlest
Answer:
The velocity of an object must include these two things displacement and time.
Explanation:
Hope this helps you. Have a nice day^_^
Please mark as brainliest. It helps a lot. :)
Hollywood studios get in trouble for a lack of diversity in their casting decisions. In order to remedy that, they create a computational model to find promising new actors. The computational model compares prospective actors to famous ones and chooses prospective actors that are the most similar to famous ones. What is a true statement about this computational model?
1. It will be effective and efficient at eliminating bias from casting decisions because computers are more objective than people.
2. Though it will choose from the applicants quicker than humans could, it will repeat the biases of the original casting decisions.
3. It is not a good idea to use computational models in the casting process as computers often deviate from the equations they're given. 4. While it would help eliminate bias from casting decisions, it is inefficient because it would be quicker for humans to choose the applicants.
Hollywood studios get in trouble for a lack of diversity in their casting decisions. The true statement about this computational model is that it will be effective and efficient at eliminating bais from casting.
Option 1 is correct.
The lack of diversity in Hollywood studios casting decisions results in the inability to select and choose the right actors for a specified role play.
The use of a computational model makes use of a computer program that studies and compares the prospective actors to famous ones and chooses prospective actors that are most similar to famous ones.
This is the best result to can be achieved and derived in making decisions in the diversity of casting because the computational model provides actors that are most effective and efficient thereby elimination the bias from casting decisions. This model is objective and it's not based on emotional decisions, unlike people.
Learn more about computational models here;
https://brainly.com/question/20292974?referrer=searchResults
Which area of study involves how mechanics and motion affect sports performance?
1.) Momentum. 2.) Velocity. 3.) Biomechanics. 4. )Centripetal force.
Answer:
biomechanics
Explanation:
Biomechanics is part of the larger field of kinesiology, specifically focusing on the mechanics of the movement. 1 It is both a basic and applied science, encompassing research and practical use of its findings.
A car accelerates at 4 m/s/s from rest. What is the car's velocity after 5 seconds?
Answer:
3m/sec
Explanation
V=u+at
23=u+4*5
23=u+20
23-20=u
U=3m/sec
A golf ball is hit with an initial velocity of 20m/s at an angle of 30° to the horizontal. calculate;
the time of flight
Answer:
tcucugxojfjgfojcigxuogoudyifodtufukdutfuocyjxuogu
Why is 250 million years called a cosmic year?
That’s the amount of time it takes the Milky Way to revolve around the Universe core.
That’s the amount of time it takes the Milky Way to rotate on its axis.
That’s the amount of time it takes the solar system to rotate on its axis.
That’s the amount of time it takes the solar system to revolve around the Milky way core.
Answer:
250 million years is called a cosmic year because - D) That’s the amount of time it takes the solar system to revolve around the Milky way core.
Explanation:
The planets in our solar system orbit around the sun. ... Even at this blazing speed, it takes the sun approximately 225-250 million years to complete one journey around the galaxy's center. This amount of time – the time it takes us to orbit the center of the galaxy – is sometimes called a cosmic year.
The cosmic year is of 250 million years because that is the amount of time it takes in the solar system to revolve around the milky way core. Hence, option D is correct.
What is the Milky way?A large spiral galaxy known as the Milky Way contains the Sun and several hundred billion other stars. It gets its name from the Milky Way, an amorphous belt of stars and gas clouds that can be viewed in the sky from Earth. Astronomers do not fully comprehend the nature of the Milky Way Galaxy, which is commonly referred to simply as the Galaxy, despite the fact that Earth is located within it.
Much of the Galaxy is hidden by a thick layer of interstellar dust that prevents optical telescopes from seeing it, and astronomers can only determine its large-scale structure with the help of radio and infrared telescopes that can detect the types of radiation that can pass through the obscuring matter.
Our solar system's planets revolve around the sun. Even at this incredible speed, one orbit of the galaxy's center takes the sun about 225–250 million years to complete. A cosmic year is another name for the period of time it takes for us to orbit the galactic center.
To get more information about the milky way :
https://brainly.com/question/2806083
#SPJ5
A substance with a pH value of 2.3 would be classified as
O strong acid
O weak acid
O strong base
O weak base
A substance with a pH value of 2.3 would be classified as a strong acid. Option A is correct.
What is ph value?pH stands for "potential hydrogen," and it is a measure of the acidity or basicity (alkalinity) of a solution. The pH scale ranges from 0 to 14, with 7 being neutral (neither acidic nor basic). Solutions with a pH less than 7 are considered acidic, and solutions with a pH greater than 7 are considered basic.
Here,
The pH scale is used to measure the acidity or basicity of a solution. Values on the pH scale range from 0 to 14. Solutions with a pH value less than 7 are considered acidic, and solutions with a pH value greater than 7 are considered basic. The lower the pH value, the more acidic the solution.
A pH value of 2.3 indicates that the solution is strongly acidic, as it is well below the neutral value of 7.
Learn more about pH value here:
https://brainly.com/question/28580519
#SPJ6
Please help meeeee!!!
Answer:
1. Test tube
2. tongs
3.
4. FUNNEL
5.
6.
7. Flask
8. Beaker
9. Bunsen burner
10. Erlenmeyer Flask
11. Molar and pestle
12. Wire gauze
13. Graduated cylinder
14. Test tube rack
15. Pipet
16. Filo
Explanation:
label the longitudinal wave
Answer:
???
Explanation:
in the free body diagram. what is the net force?
A) 40 N, right
B) 10 N, right
C) 80 N
D) 32 N, right
Answer:
None of the suggested solutions.
Explanation:
horizontally, net force is
60cos30 - 20 = 31.96... 32 N right
which might be their desired answer.
There is also a vertical net force component.
vertically, net force is 40 + 60sin30 - 40 = 30 N up
total net force is
√(32² + 30²) = 43.834... 44 N
θ = arctan(30/32) = 43° above horizontal right.
Which statement best explains how a planet affects the orbit of a comet as the comet passes by the planet?
A jumbo jet collides with a sparrow. If neither exerts a greater force of impact, which experiences greater acceleration and why
Answer:
The sparrow experiences a Much greater acceleration because of its smaller mass.
Explanation:
a = F/m With a constant force, acceleration is inversely proportional to mass.
một viên đạn được bắn lên với vận tốc v0=800m/s theo phương hợp với mặt phẳng nằm ngang một góc 30 độ. xác định tầm xa của viên đạn
Step 1 First Draw a Diagram.
Step 2 Identify the givens
g= -9.8 m/sec2
x0 = 0 m
Y-Yo= 80m
V0 = 800m/s -30o inclined from horizontal
Xf= ?
t = ?
Step 3 * A 2 dimensional problem so break it down into x component and y component
Step 4 x component
x= [Vox ][cos 30o][t]
x= [800m/s][cos 30o][tsec]
x=[692.8m/s][tsec] <---------------Need t
Step 5 y component
Y-Yo= Voy - 1/2gt2
80m= -[v][sin30o][t] -1/2gt2
1/2gt2+[v][sin30o][t]+80m=0 <-------Form Quadratic Equation
Solve for t
t= -[v sin 30] +/- [(v sin 30)-(4)(1/2)(9.8)(80)]1/2
(2)(1/2)(9.8)
t= 400+/- 398
9.8
t= 0.2 sec
Step 6 Plug this into initial x component equation
x=[692.8m/s][tsec]
Average sized stars like our own will turn into a(an) _________ at the end if their lifecycle.
A: Red Supergiant
B: Black hole
C: Neutron Star
D: Supernova Nebula
Answer:
Red supergiant.
Explanation:
When our sun is going to become a red giant, it's going to be 256 times larger than itself now.
In the free-body diagram, what is the net force? (Hint-Trig.- SOH-CAH-TOA)
a. 35 N right
b. 28 N right
c. 75 N
ACTIVITY 1: Research a Famous Chemist or Physicist
1) Do research on a famous chemist or physicist. Write a 300-500 word essay one of them. Use at least three different sources. Sources can include biographies, internet articles from universities, or journal articles. Wikipedia is not an acceptable source information.
Be sure to answer these questions:
* What did this scientist discover?
* How was it discovered?
* How does this discovery or invention impact the world today?
(Scientist: Nikola Tesla)
Answer:
What did this scientist discover?
Nikola Tesla discovered and created Bluetooth back in 19, November 5, 1898.
"The Transmission of Electrical Energy Without Wires", Electrical World and Engineer, January 7, 1905. Tesla, Nikola, World System of Wireless Transmission of Energy, Telegraph and Telegraph Age, October 16, 1927.
How was it discovered?
In 1901 Tesla began his work of a large high-voltage wireless energy transmission station called the Wardenclyffe Tower. ... Some devices already employ wireless energy transfer without the use of metal contacts. The power is transferred through the plastic cases using magnetic induction.
How does this discovery or invention impact the world today?
It changed the new age by listening to music with wireless earbuds.
