Answer:
As, we know momentum = mass × velocity that is p = mv
we have momentum (p) = 2 kg m/s
and velocity (v) = 8 m/s
so substitute values in p=mv
2 kg m/s = m × 8 m / s
m = 2 / 8 kg = 0.25 kg
Therefore, mass of substance is 0.25 kg.
2/8 in fractional form.....
Hope it helps
Please mark me as the brainliest
Thank you
an object can still run with nonzero velocity even the net force acting on the body is zero true or false?
Answer:
This is true fact.
Well done bud keep up the hard work at school
true As a non-zero net force
The force of gravity is twice as great on a 2-kg rock as on a 1-kg rock. Why then, dose the 2-kg rock not fall with twice the accelleration?
Answer:
because all objects fall at a rate of 9.8m/s²
Which type of resources do we have a limited supply of?
Explanation:
The resources that we value—time, money, labor, tools, land, and raw materials—exist in limited supply. There are simply never enough resources to meet all our needs and desires.
Explanation:
Time, money, labor, land , and raw materials
Why are some telescopes placed in space?
There is no gravity in space so bigger, heavier mirrors or lenses can be used
Some types of electromagnetic radiation cannot penetrate Earth's
atmosphere
Space telescopes are less expensive that ground telescopes
Telescopes in space are able to get significantly closer to astronomical
objects
Answer:
to get around the Earth's atmosphere so that we can get a clearer view of the planets, stars, and galaxies that we are studying.
Explanation:
hypsometer (upper fixed point
Answer:a device for calibrating thermometers at the boiling point of water at a known height above sea level or for estimating height above sea level by finding the temperature at which water boils.
Explanation:
How can inclined planes change the amount of force to move an object? A. Increase height of the inclined plane B. Increase distance of the inclined plane C. Use a wooden inclined plane instead of a metal one D. None of the above
Answer:
Option ( B ) is correct .
Explanation:
To lift a heavy weight , inclined plane is used . Use of inclined plane , makes the task easier because instead of force mg , force mg sinθ is to be used which is less than mg . Here θ is inclination of inclined plane.
If h be the height by which weight is to be lifted
potential energy acquired by weight = mgh
work done by force mg sinθ = mgsinθ x d where d is displacement required .
mg sinθ x d = mgh ( work done by force = potential energy stored in luggage )
d = h / sinθ
d will be more than h
Hence inclined plane increases the distance to be covered by force applied though it decreases the force itself.
Hence option ( B ) is correct .
What is one force listed below which helps to stop the
motion of a sled moving down a snowy hill on its own?
A.) Air Resistance
B.) Applied Force
C.) Gravity
D.) Buoyancy
Answer:
applied force
Explanation:
An applied force is a force that is applied to an object by a person or another object. If a person is pushing a desk across the room, then there is an applied force
Two football players run down the field. One has a mass of 70 kg and the other has a mass of 100 kg. Which player will be harder to tackle?
Answer:
The one with larger mass because of the momentum he has.
Explanation:
Momentum= mass x Velocity
As mass increase momentum increase.
An unknown element has 5 protons, 5 electrons, and 6 neutrons what is the atomic mass of this element
The atomic mass is the protons + the neutrons.
So your answer would be 5 + 6 = 11.
Please mark Brainliest! :)
PLEASE HELP FILL IN TWO OPTIONS I WILL MARK BRAINLIEST IF RIGHT!
Answer:
Your answers are Continental crust and Mountain range.
Explanation:
Continental crust is the first blank, and Mountain range the second.
I hope I helped, and I always appreciate Brainliest!!! :)
Need help big time plz help
Answer: hmm
Explanation:
hmmm
what kind of mirror do u think s used in the side-view mirror of cars?
Answer:
The Convex Mirror is used.
Explanation:
If a cup of coffee is at 90°C and a person with a body temperature of 36'C touches it,how will heat flow between them
Answer:
the heat always transfers from high temperature to low temperature body without aid of any external energy to this law the heat transfers from cup of coffee to the person body until both bodies reaches to the equilibrium state
Explanation:
In Alaska, salmon feed on tiny plants called phytoplankton. During late summer, salmon gather in rivers to reproduce. Grizzly bears visit these rivers to feed on the large number of salmon. Phytoplankton are . Both the salmon and the grizzly bears are . Grizzly bears are .
Answer:
-->Phytoplankton are AUTOTROPHS
--> Both the Salmon and the grizzly bears are CONSUMERS.
--> Grizzly bears are SECONDARY CONSUMERS.
Explanation:
In an ecosystem, which is the basic functioning unit of nature, the biotic components is made up of all the living organisms in it. These organisms are divided into two main groups which includes:
--> The AUTOTROPHS: These are organisms that are able to use sunlight or chemical energy to manufacture their own food from simple inorganic substances. Since Autotrophs are the only organisms that can produce food in an ecosystem, they are also known as PRIMARY PRODUCERS. Example of autotrophs includes Phytoplankton( all green plants).
-->HETEROTROPHS: These organisms cannot manufacture their own food rather they feed on ready-made food which comes from the tissues of organisms in their environment. In an ecosystem, Heterotrophs are known as the CONSUMERS. Example of Heterotrophs includes all animals (salmon and the grizzly bears).
These biotic components of the ecosystem forms a feeding pathway through which energy and nutrients are transferred step by step among organisms. This is called a FOOD CHAIN. This feeding pathway follows a certain pattern:
--> it begins with a primary producer (Phytoplankton)
--> the primary producer is eaten by a primary consumer (salmon)
--> the primary consumer is eaten by a secondary consumer (grizzly bears)
That is the reason both the Salmon and the grizzly bears are CONSUMERS but while salmon is a primary consumer, grizzly bears are SECONDARY consumers.
Answer:
correct answer below
Explanation:
If a 20 g cannonball is shot from a 5 kg cannon with a velocity of 100
m/s, then the speed of recoil of the cannon is -0.4 m/s.
true or false?
Strange as it may seem, the statement in the question appears to be TRUE.
-- Before the shot, neither the cannon nor the ball is moving, so their combined momentum is zero.
-- Since momentum is conserved, we know immediately that their combined momentum AFTER the shot also has to be zero.
-- (20g is rather puny for a "cannonball" ... about the same weight as four nickels. But we'll take your word for it and just do the Math and the Physics.)
-- Momentum = (mass) x (velocity)
After the shot, the momentum of the cannonball is
(0.02 kg) x (100 m/s ==> that way)
Momentum of the ball = 2 kg-m/s ==> that way.
-- In order for both of them to add up to zero, the momentum of the cannon must be (2 kg-m/s this way <==) .
Momentum of cannon = (5 kg) x (V m/s this way <==)
2 kg-m/s this way <== = (5 kg) x (V m/s this way <==)
Divide each side by (5 kg):
V m/s = (2/5) m/s this way <==
Speed of recoil of the cannon = -- 0.4 m/s
A car moving at a constant speed changes direction. Is the car accelerating? How do you know?
Answer:
No
Explanation:
Acceleration is the rate of change in velocity. Here the car maintains a constant speed, no change in velocity
Los barbijos de tela, a diferencia de los quirúrgicos, poseen una filtración de partículas de aproximadamente 0.000003979 [m]. Expresar dicho valor en notación científica, de tal forma que tenga solo dos decimales
Answer:
El valor en notación científica es 3.98*10⁻⁶.
Explanation:
La notación científica es una manera rápida de representar un número utilizando potencias de base diez. Esta notación se utiliza para poder expresar muy fácilmente números muy grandes o muy pequeños.
Los números se escriben como un producto:
a*10ⁿ
donde:
a es un número real mayor o igual que 1 y menor que 10, al cual se le agrega un punto decimal después de la primera cifra si se trata de un número que no es entero. n es un número entero, que recibe el nombre de exponente u orden de magnitud. Representa el número de veces que se desplaza la coma. Siempre es un número entero, positivo si se desplaza a la izquierda, negativo si se desplaza a la derecha.Para escribir el número 0.000003979 en notación científica, se realizan los siguientes pasos:
Se mueve la coma decimal hacia la derecha tantos espacios hasta llegar a la derecha del primer dígito. Se escribe entonces este número, que será el coeficiente a en la expresión del producto anterior. Se escribe la base 10 con el exponente igual a la cantidad de espacios que se mueve la coma. Este es un número negativo porque la coma se desplaza a la derecha.Entonces, en este caso:
a= 3,979 ≅ 3,98n= -6Entonces, el valor en notación científica es 3.98*10⁻⁶.
HELP PLZ HELP !!!!!!!!!!!
Answer:
From least to greatest: Neon, Sodium, Silicon, Iron, Uranium
Explanation:
Here are all the atomic numbers for each one:
Iron = 26
Sodium = 11
Uranium = 92
Neon = 10
Silicon = 14
Hope this helps! :D
A neutral oxygen atom has 8 protons and 8 electrons. It gains 2 electrons when it chemically combines with magnesium to form magnesium oxide (MgO). What is the charge of oxygen in magnesium oxide?
Answer:
in this ionic compound, oxygen has 2 excess electrons and magnesium has two electrons missing.
Explanation:
When oxygen is mixed in a chemical reaction, it acquires two electrons from magnesium, to become an ion with 2 negative .
Mg + O → MgO
Therefore, in this ionic compound, oxygen has 2 excess electrons and magnesium has two electrons missing
In air, a sound wave with a frequency of 200 Hz has a wavelength of about 1.5 meters. What is the wavelength of a wave if the frequency is increased to 600 Hz?
Answer:
see below
Explanation:
first of all, you find the speed of sound in air
which is
speed = frequency x wavelength
so
speed = 200 x 1.5
speed = 300 m/s
speed remains the same in the same medium
so you can use speed and frequency to find wavelength
speed = frequency x wavelength
300 = 600 x wavelength
wavelength = 0.5 m
hope this helps, please mark it brainliest
which continent had to move the furthest to get to where it is today based on where it was in Pangaea.
Asia I think that's right
PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer these correctly!!!! (40pts)
Answer: A
Explanation:
Just speed I think.
Speed is scalar, while velocity is a vector so you would need a direction. For acceleration you would need to know the specific speed at different points in time.
A cheetah can run 140 miles in 2 hours.
The information we can calculate about the cheetah given this information is the "speed" (A).
Is this compound Ionic or Covalent? fr2o
Answer:
it is an ionic compound
Explanation:
How much power is generated if 375 J of work is done in 15 s?
Answer: 25 watt
Explanation:
Given,
Work= 375 j
Time= 15
So, power = W÷t
= 375 ÷ 15
= 25 watt
What is a scientific model?
Answer:
A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.
Answer:
D
Explanation:
Please help??!
Which of the following uses repeating vowel sounds?
1.The cold, soulless vacuum of space
2. Cool, blue, moonlit room
3. If loneliness is a disease, love is the cure
4. Windy, whooshing weather
Answer: 4. Windy, whooping weather
Explanation: b/c it is!
Answer:
Windy, whooping weather
Explanation:
thats the answer
3. Suppose a free-fall ride at an amusement park starts at rest and is in free fall.
a. What is the velocity of the ride after 2.3 s?
b. How far do people on the ride fall during the 2.3-s time period?
Answer:
[tex]v = 22.54m/s[/tex] --- Velocity
[tex]h = 25.921m[/tex] --- Distance
Explanation:
Given
[tex]u = 0m/s[/tex] --- Initial velocity
Solving (a): Velocity after 2.3s
To do this, we use the first equation of motion
[tex]v = u + at[/tex]
Where
[tex]t = 2.3s[/tex]
[tex]a = g = 9.8m/s^2[/tex]
So, the equation becomes:
[tex]v = 0 + 9.8 * 2.3[/tex]
[tex]v = 0 + 22.54[/tex]
[tex]v = 22.54m/s[/tex]
Solving (b): Distance covered in 2.3s
We make use of:
[tex]h = ut + \frac{1}{2}gt^2[/tex]
This gives:
[tex]h = 0 * 2.3 + \frac{1}{2}*9.8 * 2.3^2[/tex]
[tex]h = \frac{1}{2}*9.8 * 5.29[/tex]
[tex]h = 25.921m[/tex]
If an ocean plate and a land mass plate converge , which one will sink
Answer:
The ocean plate will sink because it is much more dense than the continental plate.
Let me know if this helps!
A bomb, originally sitting at rest, explodes and during the
explosion breaks into four pieces of exactly 0.25 kg each.
One piece flies due south at 10 m/s while another piece flies
due north at 10 m/s. The other two pieces travel in
directions.
Answer:
opposite
Explanation:
The work per unit charge required to move a charge between two points in an electric circuit defines electric
A) force
B) Power
C) field strength
D) potential difference
The work per unit charge required to move a charge between two points in an electric circuit electric potential difference. The right option is D) potential difference
What is electric potential difference?Potential difference can be defined as the work done in moving a unit charge from one point to another in an electric field. The S.I unit of potential difference is volts (V).
From the question,
Force: is the product of mass and acceleration Power: This is the rate at which work is done.Field strength: This is the force per unit charge in a field.Potential difference: This is the work done in moving a unit charge from one point to another in a field.Hence, from the above, the right option is D) Potential difference
Learn more about potential difference here: https://brainly.com/question/24220726