Answers
Answer:
v_f = 20 m / s
Explanation:
For this exercise let's use the relationship between momentum and moment
I = Δp
F t = m v_f - m v₀
as the body starts from rest v₀ = 0
F t = m v_f
v_f = [tex]\frac{F t}{m}[/tex]
let's calculate
v_f = 4 2 / 0.4
v_f = 20 m / s
Related Questions
A spring is hung from the ceiling. A 0.442-kg block is then attached to the free end of the spring. When released from rest, the block drops 0.150 m before momentarily coming to rest, after which it moves back upward. (a) What is the spring constant of the spring
Answers
Answer:
[tex]K=58.8N/m[/tex]
Explanation:
From the question we are told that:
Mass [tex]M=0.442[/tex]
Drop distance [tex]d=0.150[/tex]
Generally the equation for Spring Constant is mathematically given by
[tex]K=\frac{2mg}{x}[/tex]
[tex]K=\frac{2*0.442*9.8}{1.150}[/tex]
[tex]K=58.8N/m[/tex]
(give the answer or I'll report) please solve it with the steps
Answers
Answer:
The required elastic potential energy is 0.068J
Explanation:
Given,
Spring force constant, k= 3.4 N/M
Spring stretch length/ Displacement, x= 0.2m
We know,
Elastic potential energy, V= [tex]\frac{1}{2} kx^{2}[/tex]
=[tex]\frac{1}{2}*3.4*(0.2)^{2}[/tex]
=[tex]\frac{0.136}{2}[/tex]
=0.068
∴The required elastic potential energy is 0.068J
(answer it or get reported) Solve it w the steps ty
Answers
Answer:
25
Explanation:
p= w/t
p= 500N/20s
p= 25
what is force of gravity
Answers
Answer:
On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects. At Earth's surface the acceleration of gravity is about 9.8 metres (32 feet) per second per second.
What happens when magma moves the tectonic plates and pressure builds up
Answers
on what factors, current sensitivity voltage sensitivity of
a galvanometer depend?
Answers
That depends upon several factors
Number of turns of coilCurrent flowing through the galvanometerTorsion constant of suspension fibreStrength of magnetic fieldRestoring force.riding a bicycle and using of wheelbarrow (kariton) are example of
A.fluid friction
B.rolling friction
C.sliding friction
D.static friction
Answers
A force of 20N displaces an object to 5m in 10s. Calculate the power.
Answers
Answer:
hope it helps you see the attachment for further information
The electric force between two charges increases when
A) both charges become negative
B) both charges become positive
C) the charges get closer together
D) the charges get further apart
Answers
Answer:
the charges get closer together
hiii can someone please help me with this thank u <//3
Answers
Answer:
7: B:
8: A:
9: D:
Explanation:
HOPE IT HELPS YOU!!
Answer:
7. (C) 12 m/s
8. (D) 44.1 m
9. (C) 9.8 m/s^2
Explanation:
8. y = -(1/2)gt^2
= -(1/2)(9.8 m/s^2)(3 s)^2
= -44.1 m
This means the ball traveled 44.1 vertically downwards.
A student said,Today, giraffes have long necks that allow them to eat leaves high in trees. They got longer necks by stretching up for even higher leaves. After many generations, the giraffe’s neck was really long.Do you think the student’s explanation for how the giraffe’s neck became long is correct? Explain.
Answers
Answer:
yes because there is also a theory about this I studied in biology
theory name -Lamarck's theory
Write a short paragraph about Fruit and Seed formation of Strawberry plants.
Answers
If a chemical spill reaches groundwater, the availability of which resource will be reduced for people in the area?
A. fish
B. drinking water
C. hydroelectric energy
D. geothermal energy
Answers
The amount of water in rivers and lakes is always changing due to inflows and outflows. Based on the information in this passage and the diagram, what are these inflows and outflows part of?
A: the evaporation process
B: the water cycle
C: the precipitation process
D: human-controlled systems
Answers
Answer:
B. Water Cycle
Explanation:
How far will a brick starting from rest fall freely in 3 seconds
Answers
Answer:
When object falls freely we can say
its initial speed will be ZERO
and its acceleration due to gravity must be
a = g = 9.8 m/s^2a=g=9.8m/s2
Now we need to find the distance of free fall in 3 s of time
So here we will use kinematics
y = v* t + \frac{1}{2} at^2y=v∗t+21at2
now we will plug in all values in it
y = 0 + \frac{1}{2}* 9.8 * 3^2y=0+21∗9.8∗32
y = 44.1 my=44.1m
So it will fall by total distance of 44.1 m
write a short note on Andromeda galaxy.
Answers
Answer:
[tex]\sf\pink{Andromeda \: galaxy}[/tex]
The Andromeda is a galaxy which is nearest to the milky way. It is also named as Messier 31 or M31 or NGC 224. It is a spiral galaxy located at a distance of approximately 2.5 million light years from earth.
another name Andromeda in Hindi is Vaikunth.
Explanation:
The Andromeda Galaxy (IPA: /ænˈdrɒmɪdə/), also known as Messier 31, M31, or NGC 224 and originally the Andromeda Nebula (see below), is a barred spiral galaxy approximately 2.5 million light-years (770 kiloparsecs) from Earth and the nearest major galaxy to the Milky Way.
Number of stars: ~1 trillion (1012)
Right ascension: 00h 42m 44.3s
WILL GIVE BRAINLIEST HELP FASTWhat is the mass of Planet X? Note: The constant of universal gravity (G) equals 6.674 X 10-11 N·m²/kg?.
What is the centripetal acceleration of moon II? Note: The constant of universal gravity (G) equals 6.674 X 10-11 N·m²/kg?
0.069 m/s2
m
0.024 m/s2
0.081 m/s2
0.040 m/s2
0 0.19 m/s2
Answers
Answer:
Explanation:
Centripetal acceleration's equation is:
[tex]a_c=\frac{v^2}{r}[/tex] where v is the velocity of the object (moon II) and r is the radius. We have the radius, but we don't have the velocity, and we can't solve for acceleration until we do have it. Assuming moon II is a circle, or close enough to be called a circle, it has a circumference.
C = 2πr. If we can find the circumference of the circle, we can plug in the orbital period for the time, the circumference for the distance, and solve for velocity in d = rt. So let's do that and see what happens.
C = 2(3.14)(9.0 × 10⁷) and
C = d = 5.7 × 10⁸. Plugging in and solving for v:
[tex]5.7*10^8=v(3.0*10^5)[/tex] and
v = 1.9 × 10³. That is the velocity we can use in the centripetal acceleration equation.
[tex]a_c=\frac{(1.9*10^3)^2}{9.0*10^7}[/tex] and
[tex]a_c=.040\frac{m}{s^2}[/tex]
These are fun!
A circuit has a current of 3 amps and is using a 9 volt battery. The circuit has a resistance of ____
ohms.
Answers
Answer:
so 9/3=3 current is 3 amperes
Explanation:
The fomula to calculate resistance is:
voltage/cutrent
9 V/3 A= 3 ohms
Motion is
displacement
a change of position in relation to another object
an object you look at to determine if something is moving
speed
Answers
Explanation:
When something is moving, we call it is in motion. It can be also defined as a change of position in relation to another object.
When an object is not moving at all, we call that it was at rest.
To be in motion, there must be a change in position.
Hence, the correct options are "a change of position in relation to another object" and "something is moving".
What are some core features of waves in physics?
Answers
Answer:
Waves are disorders that travel through a fluid medium. Several simple wave features include frequency, period, wavelength, and amplitude.
Explanation:
Q 36 - URGENT HELP PLS
WILL BE MARKED AS BRAINLIEST.
Answers
This is because you add up all of the times (1.44s+1.70s+1.58s+1.76s) and you get 6.48 then you divide 6.48 by 4 to get the average of the times. Now you get the distance (200m) and because speed=distance/time you divide 200m/1.62s to get 123m/s. I hope this made sense :)
HELP ME ASAP I WILL MARK YOU THE BRAINLIEST NO LINKS
Answers
Answer:
rolling friction is the lady in the forest
static friction is the man pushing the fridge
sliding friction is the snow kid
and fluid fraction is the bird I'm pretty sure
2. Sliding Friction
3. Fluid Friction
4. Rolling Friction
I don’t know if im fully correct, correct me if im wrong. Thanks!:)
the volume and the mass of substance are 15cm3 and 27 gm respectively find its density
Answers
Answer:
[tex]d=1.8\ g/cm^3[/tex]
Explanation:
Given that,
Mass, m = 27 grams
Volume of the substance, V = 15 cm³
We need to find the density of the substance. We know that, the density of an object is given by mass per unit volume. So,
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{27}{15}\\\\d=1.8\ g/cm^3[/tex]
So, the density of the substance is equal to [tex]1.8\ g/cm^3[/tex].
11. (a)What downward force is acting on you when you go down a waterslide? (b)What type of friction is
present? (c)If the waterslide were dry explain what type of friction in would be and (d)how that
changes your speed? (4 points)
Answers
Answer:
a) "gravitation" is the force causing you to go down a waterslide
b) It is "fluid friction" as a solid object (our body) moves over a fluid (the water)
c) It would become "sliding friction" since two solid surfaces slide over each other
d) fluid friction being the weakest friction, switching to sliding friction means a higher decrease in speed and therefore removing the water from a slide will decrease our speed
television set changes electrical energy to sound and light energy. In this process, some energy is *
Answers
Answer :light
Explanation:
A television set is another device that operates by the transformation of energy. An electrical beam from the back of the television tube strikes a thin layer of chemicals on the television screen, causing them to glow. In this case, electrical energy is converted into light.
f the voltage in a circuit is 80 volts and the resistance is 20 ohms, what is the current?
Answers
I = 4 A
Explanation:
From Ohm's law, the voltage is given by
V = IR
or
I = V/R = (80 V)/(20 ohms)
= 4 A
what is the square root of 64
Answers
Answer:
8
Explanation:
Square root means what two same numbers multiplied together equal the same number,
So:
8 × 8 = 64
----------------------------------------------------------------------------------------------------------------
Have a good day :)
Select the correct answer.
What does the number, or density, of field lines on a source charge indicate?
O A.
direction of charge on the source charge
OB.
amount of charge on the test charge
O c.
amount of charge on the source charge
OD.
direction of charge on the test charge
Reset
Next
Answers
Answer:
amount of charge on the source charge
Sound waves require a medium to travel. *
True
False
Answers
Answer:
false
Explanation:
Answer:
true
Explanation:
Space is not a medium. and we can not her anything in space. therefore you need a medium in order to hear sound waves.
please help i would really appreciate it
Answers
Answer:
Did you try searching it up
Explanation: