A big machine is composed of several moving and stationary parts. Some of these parts are in a state of constant motion hence they periodically rub against each other.
Explain about mechanical advantage:The Mechanical Advantage (MA) of a machine is the ratio between the output force produced by the machine divided by the input force exerted on it:The MA is generally a number larger than 1, since machines are used to "multiply" the force applied.There are actually 2 values of the mechanical advantage for a machine:The Ideal Mechanical Advantage (IMA), which is the MA when there are no frictional force acting on the machine, and so when all the work done in input is transferred as energy in output The Actual Mechanical Advantage (AMA), which is the MA when taking into account the frictional forces, which cause a dissipation of part of the energy; so, not all the work done in input is transferred as energy in outputThe efficiency of a machine is defined as the ratio between the two:A machine cannot have an efficiency of 100% because there are always some frictional/resistive forces acting on the system, so part of the energy in input is always dissipated, and therefore AMA < IMA, and so the efficiency is not 100%.As we know that friction force is the resistive force due to relative motion of two surface. When one surface is moving relative to other surface then the motion is resisted by the interaction force between two surface which is known as friction force.To learn more about mechanical advantage refer to:
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In scientific notation, 0.00074m can be written as 1- 0.74×10‐³m 2- 7.4×10-⁴m 3- 74×10‐⁵m 4- 740×10‐⁶m
Answer:
[tex]0.00074m[/tex] [tex]=[/tex] [tex]7.4*10^{-4}m[/tex]
Explanation:
Given
[tex]0.00074m[/tex]
Required
Express as scientific notation
The scientific notation of a number is: [tex]a * 10^{b}[/tex]
Where [tex]1 \le a \le 9[/tex]
This implies that:
[tex]0.00074m = 7.4 * 10^b[/tex]
Next, is to determine the value of b.
Count the number of point to move from the current point location to 7.4.
If the point moves backward, b will be negative, else b will be positive.
So:
[tex]0.00074m[/tex] [tex]b=-4[/tex]
Hence:
[tex]0.00074m[/tex] [tex]=[/tex] [tex]7.4*10^{-4}m[/tex]
The screens show two sound waves that last the same amount of time. Which wave has a higher frequency? Explain your answer
Answer:
Wave 1
Explanation:
Its a High frequency waves the high waves are closer to each other thme the lower ones
If the force between two charges with opposite signs is -36 newtons, what is the force between two charges with the same sign?
Answer:
36 Newtons
Explanation:
The force of attraction or repulsion between two charges can be given by Coulomb's Law:
[tex]F = \frac{kq_1q_2}{r^2}[/tex]
where,
F = Force
k = Coulomb's Constant
q₁ = magnitude of first charge
q₂ = magnitude of second charge
r = distance between charges
Hence, the charges with opposite signs will produce a result with a negative value. While, the charges with same sign will produce positive result of force value.
Hence, the force between two charges with the same sign will be 36 Newtons
Use the image to answer Questions 4–6.
What takes place at Point A?
conduction
convection
radiation
sublimation
What takes place at Point B?
conduction
convection
radiation
sublimation
Image attached
Answer:
the first one is c and the second is b
When a bulb is connected to a 12V cell a current of 0.05A flows through the bulb.
What is the resistance of the bulb?
Use the equation
resistance (R) = (V) voltage/ (I) current
A 0.6 Ω
B 6 Ω
C 24 Ω
D 240 Ω
Answer:
=0.6
Explanation:
R=v*I
R=12*0.05
R=0.6
A 10 kg firework is shot in the air at 75 m/s. What is the momentum of the firework?
Answer:
Momentum = 750 Kgm/s
Explanation:
Given the following data;
Mass = 10 kg
Velocity = 75 m/s
To find the momentum;
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
Substituting into the formula, we have;
Momentum = 10 * 75
Momentum = 750 Kgm/s
A bag of marbles is hanging motionless on a spring scale. What prevents the bag from falling?
Answer:
The vector sum of all forces acting on it is zero, its at equilibrium.
Explanation:
The bag of marbles hanging on a spring scale applies its weight downwards, which was counterbalanced by the reaction from the spring scale (obeying the Newton's third law of motion). And since no external forces are applied to the system, thus the equilibrium of the system.
If the weight of the bag is greater than the reaction from the spring scale, the scale breaks and the system would not be balanced.
Daphne swings a 15.0 kg bucket of water in a vertical circle of radius 1.3 m. What is the minimum speed, v, at the top of the circle that the pail has to go if the water is not to spill?
Answer:
3.6 m/s
Explanation:
a positively charged body makes contact with a body. after a while, the charged body becomes neutralised. state 3 main conditions for this scenario to occur.
Answer:
A body will become positively charged when some electrons will come out from the body.Thus, positive charge is due to deficiency of electrons.
Can someone list 6 advantages of renewable energy.
Answer:
Solar energy, Wind energy, Hydro energy, Tidal energy, Geothermal energy, Biomass Energy.
Explanation:
I hope that it helps you...
Can I have an anime weirdo friend that's a girl pwease cuz guys are mean and don't understand. I'm a 16 yo guy
Answer:
Girls, we found one.
The "uwu pwease pwotect me, waifu" 'nice guy' that tries convincing naive girls to send inappropriate pictures within 2 hours of knowing them because he "in love" them.
The reality of the situation is the dude is very desperate and wants to project their anime girl fantasies onto a girl that pities them because "gwuys are mwean" to them.
Step-by-step explanation:
You're 16, kid. Two years until you're 18. Just say you want a weeb girl/friend. no need to try and draw pity from little girls and use that to manipulate them. If you said this when you were 12, it would be excusable. But you're 16. If you want to attract girls, don't use pity. Or try to type words in a cutesy manner, that's just very unattractive and makes you seem desperate.
During which type of radioactive decay does a nucleus gain a proton but keep
the same atomic mass number?
A. Alpha decay
B. Beta decay (electron)
C. Gamma decay
D. Beta decay (positron)
SUBMIT
Answer:
A. Alpha decay
Explanation:
Answer:
Beta decay (electron).
Explanation:
A convex lens of crown glass has a focal length of 15 cm. The lens is placed in water. Determine whether the lens behaves as converging or diverging lens and determine it's focal length. With explanation
Answer:
convex lens also called diverging lens
Find the frequency of a 63.8-cm long open end air column
that resonates as shown in the diagram at the right. The speed of sound in the air is 345 m/s.
Answer:
f = 270.37 Hz
Explanation:
Given that,
The length of the long open end air column, L = 63.8 cm
The speed of sound in the air is 345 m/s
We need to find the frequency of the air column. For an open pipe, the frequency is given by :
[tex]f=\dfrac{nv}{2L}\\\\f=\dfrac{345}{2\times 63.8\times 10^{-2}}\\\\f=270.37\ Hz[/tex]
So, the frequency of the air column is equal to 270.37 Hz.
How fast does a 500kg car need to drive to have 100,000 J of kinetic energy?
Answer:
The car must move at 2 m/s to have a Ke of 2,000 Joules.
Explanation:
Mark me pls
How can we teach our kitty to behave properly
Answer:
I have no idea.
Explanation:
I just wanted to tell you I absolutely read this wrong.
Which of the following ways of writing 1000w is incorrect?
1) 1 kW
2) 1 x 10³ W
3) 10 x 10³ W
4) 1.0 x 10³ W
Answer:
the third one is incorrect
Explanation:
10 x 10³= 10^1 x 10^3 = 10^4
1. Why is the equivalent resistance in a parallel circuit equal to the sum of the reciprocals of the individual resistances, whereas in a series circuit, the equivalent resistance is the sum of the individual resistances?
Answer: Kirchhoff first law: sum of currents coming in branch and leaving it are same.
Explanation: in parallel circuit current is divided between resistors.
In series circuit same current passes through all resistors.
A .001 kg bead slides without friction around a loop-the-loop. The bead is released from a height of 20.6 m from the bottom of the loop-the-loop which has a radius 7 m. The acceleration of gravity is 9.8 m/s [photo] What is its speed at point A ? Answer in units of m/s. Your answer must be within ± 5.0%
Answer:
11.37 m/s
Explanation:
We are given;
Mass; m = 0.001 kg
Initial velocity; v1 = 0 m/s (since it was released from rest)
Initial height; h1 = 20.6m
From the attached image of the bead in the loop, we can see that height at A; h2 = twice the radius = 2R = 2 × 7 = 14 m
g = 9.8
To solve for the speed at point, we will use formula for conservation of energy. Thus;
½m(v1)² + mgh1 = ½m(v2)² + mgh2
Divide through by m to get;
½(v1)² + gh1 = ½(v2)² + gh2
Plugging in the relevant values;
½(0²) + (9.8 × 20.6) = ½(v2)² + (9.8 × 14)
Rearranging, we have;
½(v2)² = ½(0²) + (9.8 × 20.6) - (9.8 × 14)
Simplifying, we have;
½(v2)² = 64.68
Multiply both sides by 2 to get;
(v2)² = 2 × 64.68
(v2)² = 129.36
v2 = √129.36
v2 = 11.37 m/s
A golfer wants his shot to land
122 m away on flat ground.
His club launches balls at a 55.0°
angle. How fast should
the ball leave the club?
(Unit = m/s)
Answer:
35.67 m/s
Explanation:
Applying the formular for range,
R = u²sin2∅/g....................... Equation 1
Where R = Range, u = Initial Velocity, ∅ = angle of launch, g = acceleration due to gravity
make u the subject of the equation
u = √(Rg/sin2∅)............. Equation 2
Given: R = 122 m, g = 9.8 m/s², ∅ = 55°
Substitute these values into equation 2
u = √[(122×9.8)/(sin(2×55))]
u = √(1195.6/sin110)
u = √(1272.33)
u = 35.67 m/s
Answer:
35.67
Explanation:
Its the correct answer for Acellus
A 1,680 kg satellite is in a circular orbit around Earth with a tangential speed of 6,578 m/s. What is the height of the satellite above the surface of the Earth?
Answer:
Recall that Earth’s radius is 6.38 × 106 m and Earth’s mass is 5.97 × 1024 kg.
Explanation:
Answer:
A- 2.7 on USA Test prep
Explanation:
how do you know which magnitude is higher or how do you compare them?
Solve the speed for the blank this is a PHET LAB
Explanation:
The volume of matter contained in an item is measured in kilograms. It claims that a material's rate in velocity is equal to the force exerted and occurs in the force's path.
Speed (Velocity) = Force / Mass
Speed (Velocity) = 25 / 50 = 0.5 m/s
Speed (Velocity) = 50 / 50 = 1 m/s
Speed (Velocity) = 7 / 50 = 1.5 m/s
Speed (Velocity) = 100 / 50 = 2 m/s
Speed (Velocity) = 200 / 50 = 4 m/s
If a force is applied to an object, which of the following must be true?
A. The object will begin to move.
B. The velocity will stay constant.
C. The object will accelerate.
D. The force applied will contribute to the total net force.
please dont send any links to files or anything like that as i cannot open it, thank you :))
Answer:
A. The object will begin to move.
Explanation:
Answer:
A
Explanation:
The law of superposition.
1 poi
True or False: An object can be in motion and not in motion at the same
time depending on which frame of reference you are comparing the
motion to.
O True
False
Answer:
true
Explanation:
for example assume you are setting in a moving bus and when someone see you from the ground you are in motion but for some who is with you in the bus you are not in motion.
● Describe what Neptune needs to sustain life.
● Describe the current conditions of Neptune. How is it there?
● What is the final recommendation for the humans living on Neptune? Explain.
Answer:
1)the planet would need to have a source of energy that bacterial life can exploit, as well as a standing source of liquid water. At its surface, the temperature of Neptune dips down to 55 Kelvin. That's very cold, and there's no way liquid water could exist.
2)Neptune has the wildest and strangest weather in the entire Solar System. It has huge storms with extremely high winds. Its atmosphere has dark spots which come and go, and bright cirrus-like clouds which change rapidly. Neptune has an average temperature of -353 Fahrenheit (-214 Celsius).
3)To find life on Neptune, the planet would need to have a source of energy that bacterial life can exploit,
10. A pitcher in a professional baseball game throws a fastball, giving the baseball
a momentum of 5.83 kg. m/s. Given that the baseball has a mass of 0.145 kg,
what is its speed?
Answer: 40.2m/sec
Work: v=p/m= 5.83kg/0.145k=40.2cm/sec
Cold water flows to the solar panels at 15°C. During the day, the panels supply 3.8 kg of hot water
at 65°C every hour.
(a) Calculate the average energy that the solar panels deliver to the water in one hour.
Specific heat capacity of water = 4200 J/(kg°C).
Answer:
The average energy that the solar panel delivers to the water in one hour is 798,000 Joules
Explanation:
The given parameters are;
The temperature of the water that flows to the solar panels, T₁ = 15°
The mass of the hot water the panel supplies during the day, m = 3.5 kg
The temperature of the hot water supplied by the panel, T₂ = 65 °C
The heat capacity of the water, c = 4,200 J/(kg·°C)
The heat delivered to the solar panels in one hour, ΔQ, is given by the following formula
ΔQ = m·c·ΔT
m = 3.8 kg, c = 4,200 J/(kg·°C), and ΔT = T₂ - T₁ = 65 °C - 15 °C = 50 °C
∴ ΔQ = 3.8 kg × 4,200 J/(kg·°C) × 50°C = 798,000 joules
∴ΔQ = 798,000 joules
The average energy that the solar panel delivers to the water in one hour, ΔQ = 798,000 joules.
Explain why Iceland is a good place to use hydrothermal power, power produced from heated water
PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST The actual subject is Science but they dont have that as a option in pick a subject
Answer:
Third option
Explanation:
To calculate meters per second you divide the distance by the time.
it's 8m/s