2.One car with a mass of 400kg is traveling east at 20m/s and collides with a car of mass 800kg traveling west at 15m/s. Assuming the collision is completely inellastic, what is velocity of the first car after the collision?
Answer:
3.33 m/s west
Explanation:
East is the positive direction.
400kg*20m/s + 800kg*-15m/s =(400kg+800kg)*v
-4000kgm/s=1200kg*v
v=-3.33
400kg*20m/s + 800kg*-15m/s =(400kg+800kg)*v. -4000kgm/s=1200kg*v and v=-3.33.
What is Collision?Collision, which is also known as impact, is the abrupt, powerful coming together in close proximity of two bodies, such as two pool cues, a golf club and a ball, a hammer and a nail, two railroad cars when linked, or a falling object and a floor.
Two factors—the force and the amount of time the items are in contact—affect the outcome of impact in addition to the characteristics of the two objects' materials.
A hard steel ball dropped on a steel plate will typically rebound to almost the same location from whence it was dropped, while a putty or lead ball would not.
Therefore, 400kg*20m/s + 800kg*-15m/s =(400kg+800kg)*v. -4000kgm/s=1200kg*v and v=-3.33.
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Consider a man walking around a house in a rectangle pattern. He walks 70 feet across the front, 30 feet along the side, 70 feet along the back, and 30 feet along the other side o bring him back to where he began. How much distance did this man cover?
200 feet
100 feet
140 feet
70 feet
Answer:
200ft
Explanation:
To find out how much distance the man covered, you need to find the perimeter of the rectangle. To find the perimeter of a rectangle, the formula is:
P = (L + H) × 2
Step 1
Plug in the values for L and H.
P = (70 + 30) × 2
Step 2
Add 70 and 30, because you need to add parentheses first.
P = (100) × 2
Step 3
Remove parentheses, and multiply 100 by 2.
P = 100 × 2
P = 200
Thus, the man walked 200 feet in distance.
Explain the roles of the sympathetic division and parsympathetic division of the ANS in a fear response.(this is for psychology class,thank you very much)
Answer:
The parasympathetic division increases digestive activity and the sympathetic division decreases it. The Sympathetic Division of the ANS is responsible for mobilizing the body in response to situations that are threatening or otherwise exciting.
Explanation:
Have a great rest of your day
#TheWizzer
Answer:
What he said :3
Explanation:
Have a LOVELY~ day
-Roxanne Wolf
P.S: Novy made this picture for mwe UWU
A light-year is a unit generally used to express the distance that light travels in one year. Which of these can be expressed in the light years?
A] the age of a rock
B] the distance between two stars
C] the speed at which the earth revolves around the sun
D] the time earth takes to complete a revolution around the sun
The option that can be expressed in light years is " the distance between two stars." The correct option is B.
What is a light year?A light-year is a unit of distance used to measure astronomical distances. It is defined as the distance that light travels in one Earth year in the vacuum of space, which is approximately 9.46 trillion kilometers (5.88 trillion miles). Light travels at a speed of about 299,792,458 meters per second (or approximately 186,282 miles per second), which means that in one year, light can cover a distance of 9.46 trillion kilometers. Light years are commonly used to measure the distance between stars and galaxies, and since space is vast, other units of distance are often not practical.
Here in the Question,
A] The age of a rock is a measure of time, usually in millions or billions of years, and cannot be expressed in light years, which is a unit of distance.
C] The speed at which the Earth revolves around the sun is measured in kilometers per second or miles per hour and represents a velocity, not a distance. Hence it cannot be expressed in light years.
D] The time it takes for Earth to complete a revolution around the sun is measured in days or years and is again a measure of time, not distance. So it cannot be expressed in light years.
Therefore, Only B The distance between two stars is a measure of distance, which can be expressed in light years since it is a vast distance and other units may not be suitable.
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explain what uncertainty is and how you would calculate the uncertainty of a mean result
Answer:
https://stats.stackexchange.com/questions/454120/how-can-i-calculate-uncertainty-of-the-mean-of-a-set-of-samples-with-different-u
Explanation:
HELP ME NOW PLEASE !!!
A stone of 4.5 kg mass is falling from the top of a 60 m high multi storey building.Find the kinetic energy of the stone when it reaches the ground.
The kinetic energy will be equal to the potential energy at top
PE=mghm is mass
h is height
PE=4.5(60)(9.8)PE=2646JWhat happens to the light when it passes through a converging lens?
a) the light spreads apart
b) the light meets at a point
c) the light is reflected backwards
Answer:
B
Explanation:
the lines WILL meet at a point after crossing focal point
200 N of force is applied to an object causing it to accelerate at 10 m/s^2. What is the mass of the object?
[tex]~~~~F=ma\\\\\implies m = \dfrac{F}a = \dfrac{200~ N}{10~ ms^{-2}} = 20~ \text{kg}\\\\\text{The mass of the object is 20 kg.}[/tex]
If a proton and an electron are released when they are 2.0 * 10-10 m apart (a typical atomic distance), find the initial acceleration of each particle.
The initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
What is electrostatic force?The electrostatic force F between two charged objects placed distance apart is directly proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between them.
F = kq₁q₂/r²
where k = 9 x 10⁹ N.m²/C²
Given is the charge on proton and electron is q =1.6 x 10⁻¹⁹ C, distance r =2 x 10⁻¹⁰m , then the force will be
F = k q²/r²
Substituting the above values in the formula, we get the electrostatic force,
F = (9 x 10⁹) (1.6 x 10⁻¹⁹)²/(2 x 10⁻¹⁰)²
F = 5.76 x 10⁻⁹ N
The acceleration of electron when both proton and electron released is
acceleration = electrostatic force / mass of electron
Putting the values, we have initial acceleration of electron
a = (5.76 x 10⁻⁹)/(9.1 x 10⁻³¹)
a = 6.33 x 10²¹ m/s²
The acceleration of proton is due to the electrostatic force of attraction between proton and electron is given by
acceleration = electrostatic force / mass of proton
inserting the values, we get the initial acceleration
a '= (5.76 x 10⁻⁹)/( 1.67 x 10⁻²⁷)
a'= 3.45 x 10¹⁸ m/s²
Thus, initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
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An isotope of Technetium has a half-life of 6 hours. If it is given to a patient as part of a medical procedure,
what fraction of the radioisotope remains in the body after one day?
How does the ratio of tin to copper affect the properties of the alloy bronze?
Answer:
Stronger and harder than either of the pure metals
Explanation:
2. What do you understand by balanced and unbalanced force
Balanced forces are forces that do not result to change in motion while unbalanced forces are forces that result to change in motion.
What is force?Force is defined as the product of mass and acceleration of an object. That is Force = mass × acceleration.
Balanced force is a type of force that do not result to change because the forces are equal in size and opposite.
Unbalanced force is a type of force that result to change because forces on the opposite sides are not equal.
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How are tardigrades related to astronomy?
A.
They live long enough to survive long space journeys.
B.
They are the only life form that requires no oxygen to survive.
C.
They can survive in extreme, harsh environments, including space.
D.
They are able to propel themselves in zero gravity environments.
Tardigrades related to astronomy as they can survive in extreme, harsh environments, including space for long time without oxygen. The correct option is A , B and C.
What is tardigrades?A special adaptation that allows the tiny animal known as the tardigrade to curl up into a dry, lifeless ball and survive for decades.
Tardigrades can undergo utter vacuum and intense pressures more than five times as in the deepest ocean. Temperatures up to 300F and as low as -458F is maintained.
They survive in space and for long time for about 10 days. They can live without water for decades.
Thus, the correct option is A , B and C.
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Please help, im stuck on this question
Answer:
A) .27 A
Explanation:
v = ir
i = v/r
equivalent r = 45 * 90 / (45+90) = 30 ohms ( for the two r in parallel)
i = 8v / 30 ohm = 267 mAmps
how frequently should a thermometer be calibrated for accuracy
Answer:
Well before every single shift.
Explanation:
I acutally learned this yesterday
Which of the following is Newton's Second Law of Motion?”
“A moving object will continue to move at the same velocity until there is a change in
direction or an external force is applied to it."
"When a force acts on an object, the rate of change of momentum experienced by the
O object is proportional to the size of the force and takes place in the direction in which the
force acts.
"For every force that is exerted by one body on another, there is an equal and opposite
force exerted by the second body on the first."
"A body continues in a state of rest or of uniform velocity unless acted on by an external
force.
Which telescopes must be placed in orbit around earth in order to observe short-wavelength radiation?.
Space telescopes must be placed in orbit around earth in order to observe short-wavelength radiation.
What is telescope?A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to watch distant objects.
When atoms in a gas reach this temperature, they travel so quickly that when they collide, they release X-ray photons with wavelengths smaller than 10 nanometers.
Because the Earth's atmosphere prevents all X-rays from space, these wavelengths must be seen using space telescopes.
To study short-wavelength radiation, space telescopes must be put in orbit around the Earth.
Hence, space telescope is the correct answer.
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Why is it not easy to witness
inertia on Earth?
A. Magnetism is much stronger.
B. Gravity and friction are always acting on
objects.
C. Our mass is too small.
D. Our mass is too large.
what do a class 1 lever and a class 2 lever have in common?
a)both levers place the fulcrum in between the applied force and the object being lifted.
b)both levers would lift an object on the same side of the fulcrum as the applied force
c)both levers have an output force in the same direction as the input force.
d)both levers result in a larger output force from a smaller input force.
The similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.
What is a lever?A lever is a rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied.
A lever has three classes based on the position of the fulcrum as follows:
Class 1 has the fulcrum placed between the effort and load Class 2 has the load between the effort and the fulcrumClass 3 has the effort between the load and the fulcrumTherefore, the similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.
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I need help with my homework please? I will give a lot of points and a brainlist.
#1
True
All metals attract magnets
#2
Yes true
Away from magnetic field if you place something it won't attract that
#3
False
Its only possible in case of electromagnetic force fields .
#4
False
Electromagnetic force field
#5
True
The mass of the Moon is 7.35 × 1022 kg and its radius is 1738 km. What is the gravitational field strength on the surface of the Moon?
Answer:
g = 1.62 N/kg
Explanation:
g = GM/r²
= (6.67 x 10⁻¹¹ x 7.35 x 10²²) / (1738 x 10³)²
= 1.62 N/kg
Hope this helps!
When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be ___.
When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.
What is type S fuse?
Type S fuses are also called tamper proof fuses because each fuse size has a different base and thread size.
These fuses also require the use of a special adapter which is screwed into the standard Edison base of the fuse holder.
Thus, when plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.
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What label should mateo place in the marked cell? uses electrical energy provides electrical energy measures electric current controls electric current
The product label which Mateo should place in the marked cell is that it: B. provides electrical energy.
What is a product label?A product label refers to a paper-document which contains information about the chemical elements, nutrients, and other compounds that are present in a product and its function.
In this scenario, the product label which Mateo should place in the marked cell is that this product was designed and developed to provide electrical energy, based on the electrical symbol for battery shown in the image attached below.
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Two bowling balls each have a mass of 8.3 kg. They are located next to each other with their centers 0.165 m apart. What gravitational force do they exert on each other
Hello!
We can use the equation of Newton's Law of Universal Gravitation to solve for the Force of Gravity:
[tex]F_g = \frac{Gm_1m_2}{r^2}[/tex]
Fg = Gravitational Force (N)
G = Gravitational Constant (6.67 × 10⁻¹¹ Nm²/kg²)
m1, m2 = masses (both 8.3 kg in this situation)
r = distance between the center of masses of the objects (0.165 m)
Plug in the given values and solve.
[tex]F_g = \frac{(6.67 \times 10^{-11})(8.3)(8.3)}{(0.165^2)} = \boxed{1.6878 \times 10^{-7} N}[/tex]
Can someone please answer this, ill give you brainliest Would be very appreciated.
[tex]{\large{\red{\mapsto{\maltese{\underline{\green{\boxed{\blue{\underbrace{\overbrace{\pink{\pmb{\bf{Answer:}}}}}}}}}}}}}}[/tex]
Weather
Explanation:
As during climate only one season change to another and it's a long period of time
while in weather it's can change into any season for few days depending on the relief of the area.
Answer:
weather
Explanation:
There is often confusion between weather and climate. Weather is the condition of the atmosphere at a particular place over a short period of time.
A massless string connects a 10.00 kg mass to a 13.00 kg cart which is resting on a frictionless horizontal surface. The mass hangs over a frictionless pulley. When the mass is released, the cart accelerates to the right. What is the cart’s acceleration? The cart's acceleration is m/s^2. (round to one decimal place)
The cart's acceleration to the right after the mass is released is determined as 7.54 m/s².
Acceleration of the cart
The acceleration of the cart is determined from the net force acting on the mass-cart system.
Upward force = Downward force
ma = mg
13a = 10(9.8)
13a = 98
a = 98/13
a = 7.54 m/s²
Thus, the cart's acceleration to the right after the mass is released is determined as 7.54 m/s².
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Which of the following is velocity?
-35.2 m/s
125 m/s East
All of these are examples of velocity.
+95 m
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Velocity is defined as total displacement occurrence by the given time interval, and since it's a Vector quantity it has direction as well.
So, the correct choice will be ~ B. 125 m/ East
Because it has unit of Velocity ( that is - m/s ) and it shows direction of displacement ( that is - East )
a man pulls a sled horizonally by exerting 64 Lb on teh rope that is tied to its front endd. if the rope makes an angle of 45 dgrees with horizontal, find the work done in moving teh sled 35 feet
The work done in moving the sled 35 feet when force is aligned from the horizontal is 1583.9 lb.ft
What is work done?Work done is equal to product of force applied and distance moved.
Work = Force x Distance
W = Fs cos θ
Given is the distance d =35 ft ,the force exerted F = 64lb and the angle of force from the horizontal direction is 45°.
Substituting the values, work done will be
W =64 x 35x cos 45°
W = 1583.9 lb.ft
Thus, the work done will be 1583.9 lb.ft
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A beam of light with a wavelength of 4.0 millimeters is shot at an opaque barrier with four different-sized holes. Which hole will cause the light to diffract to the greatest degree?
Answer:1mm
Explanation:
another word for iron oxide?
Answer:
Hydrated iron(III) oxide, or ferric oxide
Explanation: