Explanation:
key to this problem is the impulse-momentum theorem which states that the change in the momentum of an object is equal to the impulse applied into it.
J
=
Δ
p
,
where
J
is the impulse and
Δ
p
is the change in momentum. Basically, the impulse is the product of force and time duration, that is,
J
=
F
Δ
t
In this problem, the impulse would be the product of the force stopping the rock and
0.7
s
.
On the other hand, momentum
p
is the product of the mass
m
and velocity
v
. Therefore, the change in momentum is given by
Δ
p
=
m
2
v
2
−
m
1
v
1
.
Starting with the impulse-momentum equation, we have
J
=
Δ
p
F
Δ
t
=
m
2
v
2
−
m
1
v
1
Divide both sides by
Δ
t
,
we get
F
Δ
t
Δ
t
=
m
2
v
2
−
m
1
v
1
Δ
t
F
=
m
2
v
2
−
m
1
v
1
Δ
t
Finally, substitute the values and we get
F
=
(
2
kg
)
(
0
)
−
(
2
kg
)
(
6
m
s
)
(
0.7
s
)
F
≈
−
20
kg
m
s
2
Since
1
N
=
1
kg
m
s
2
,
then
F
≈
−
20
N
Therefore, using the correct significant figures (in this case, we need one significant figure since 2 kg, 6 m/s and 0.7 s all have one) in the final answer, we would need to have approximately
20
N
force to stop the rock in
0.7
s
.
Note: The negative sign is referring to the direction of the force opposite of the direction of the velocity
v
1
.
will give brainliest to correct answer.
A particle has a charge of 1.9x10-6C. What is the charge on a second particle if the electrical force acting on it is 25N at a distance of 0.32m away?
Answer:
1.5X10^-4C
Explanation:
Expression for the electric force between the two charges is given by -
F = (k*q1*q2) / r^2
Here, k = constant = 9 x 10^9 N*m^2 / C^2
q1 = unknown
F=25N
q2 = 1.9x10^-6 C
r = 0.32 m
Substitute the given values in the above expression -
25=9x10^9 *(q1) * 1.9 x10^ -6/ (0.32m)^2
25= 17,100* (q1)/ 0.1024
multiply both sides by 0.1024 to get rid of the denominator
2.56=17,100*(q1)
Divide both sides by 17,100 to isolate q1
q1=1.5x10^-4C
A dog running at 7.92 m/s slows down to 3.22 m/s in 4.88 s. How far does he go during this period of time?
Answer:
the distance traveled by the dog is 27.18 m.
Explanation:
Given;
initial velocity of the dog, u = 7.92 m/s
final velocity of the dog, v = 3.22 m/s
time of motion, t = 4.88 s
The distance traveled by the dog is calculated as;
[tex]s = (\frac{v+u}{2} )t\\\\s = (\frac{7.92 + 3.22}{2} )(4.88)\\\\s = 27.18 \ m[/tex]
Therefore, the distance traveled by the dog is 27.18 m.
Can someone help me please
Answer: The distance traveled by the car once around the racetrack = 100 meters.
Explanation:
Given: The length of the track = 100 meters
The distance is defined as the actual measurement of the path traveled by a body or an object.Then, the distance traveled by the car around the racetrack = Length of the track = 100 meters.
Hence, the distance traveled by the car once around the racetrack = 100 meters
HELP ME
Assume a person has a mass of 50.0kg and the Earth has a mass of 5.98 x 10^24kg. If the radius of Earth is given by 6.38 x 10^6m.
a) find the gravitational force between the person and Earth
b) Find the weight of the person
c) how do these answers compare?
Answer:
a) F =489.95 N
b) W = 490 N
c) both have same value
Explanation:
a)
The force of gravitation between two objects is given by Newton's Law of Gravitation. According to this law:
[tex]F = \frac{Gm_{1}m_{2}}{r^{2}}\\[/tex]
where,
F = Gravitational Force between the person and Earth = ?
G = Universal Gravitational Constant = 6.67 x 10⁻¹¹ Nm²/kg²
m₁ = mass of peerson = 50 kg
m₂ = mass of earth = 5.98 x 10²⁴ kg
r = distance between person and earth = radius of earth = 6.38 x 10⁶ m
Therefore,
[tex]F = \frac{(6.67\ x\ 10^{-11}\ Nm^{2}/kg^{2})(50\ kg)(5.98\ x\ 10^{24}\ kg)}{(6.38\ x\ 10^{6}\ m)^{2}}\\\\[/tex]
F = 489.95 N
b)
The weight of the person will be given as:
[tex]W = m_{1}g\\W = (50\ kg)(9.8\ m/s^{2})[/tex]
W = 490 N
c)
Both have same value
: Modeling Chemical Reactions
Due 02/01/21 11:59
Keesha performed a chemical reaction, and the products looked quite different from the reactants She knew the amount of matter had not changed due
to the law of conservation of mass According to the law or conspivation of mass, what happens in a chemical reaction?
A Matter is not created or destroyed and the same amount of mass remains
B A new kind of matter is created and the amount of mass either increases or decreases
C Matter is not created or destroyed and the amount of mass may change after the reaction
D. New matter is created and changes form so that the mass of the reactants and the products will almost be equal
no
Answer:
A Matter is not created or destroyed and the same amount of mass remains
Explanation:
In a chemical reaction, according to the law of conservation of matter, "matter is neither created nor destroyed and the same amount of mass remains in such a process".
New kinds of products are formed in a chemical reaction because they undergo chemical changes. The chemical changes results in energy changes and formation of new kinds of substances. Based on the law of conservation of matter, mass is constant. Mass is not lost or gained.•when there is no temperature difference between a substance and its surroundings, no net energy is transferred as heat
A.true
B.false
Answer:
A. True
Explanation:
It is true that when there is no temperature difference between a substance and its surrounding, no net energy is transferred as heat.
The term used for this is thermal equilibrium. Thermal equilibrium occurs when two substances or even places are at the same temperature.
For heat to flow a gradient must be set up. The gradient implies that one part is at a higher temperature than the other. So, the system then works till thermal equilibrium is attained. Heat generally moves from a hotter to a colder body. When both bodies are at even or equal temperature, then heat stops moving.Calculate the time of fight for a horizontally launched projectile from a height of 20m above the ground with an initial velocity of 5m/s.
Please
Answer:
0.5sec
Explanation:
Parameters
Height(H) =20m
Initial velocity(u) = 5m/s
Acceleration due to gravity(g) =10m/s^2
Method one
Using the second law of motion
H=ut-1/2gt^2
20=5t-1/2×10×t^2
20=5t-5t^2
dh/dt = 5-10t
where any constant is zero therefore the 20 is zero
5-10t=0
Collect like terms
-10t= -5
t=1/2 = 0.5sec
2nd method
Parameters
Height(H) =20m
Initial velocity(u) = 5m/s
Acceleration due to gravity(g) =10m/s^2
Using the time taken formula
t=u/g
t=5/10
t=0.5sec
An astronaut has a mass of 95 kg. Calculate his weight on the Earth’s moon. The acceleration due to gravity on the Earth's moon is 1.6 m/s^2.
Answer:
95 x 1.6 = 51.78 is your answer
Explanation:
the question is asking for the weight of the object so you multiply and get 51,78
An astronaut has a mass of 95 kg so his weight on earth's moon where the acceleration due to gravity is 1.6 m/s² is 152 N.
What is the acceleration due to gravity?The acceleration that an object experiences as a result of the gravitational force is known as acceleration due to gravity. ms² is its SI unit. It has a direction and a magnitude. It is a vector quantity as a result.
The letter g stands in for the acceleration brought on by gravity. Its typical value at sea level on the surface of the earth is 9.8 ms2. The second law of motion and the law of universal gravitation of Newton serve as the foundation for its computation formula.
According to the question, the given values are :
Mass, m = 95 kg
Acceleration due to gravity, g = 1.6 m/s²
The formula is :
W = m × g
W = 95 × 1.6
W = 152 N
So, the astronaut's weight on the Earth's moon will be 152 N.
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Increasing friction is necessary for which of the following?
A) free wheel of bicycle
B) Chain of bicycle
C) Bicycle handle bar
D) ball bearing in front wheel
Answer:
simple answer is C ok you
An object that floats in water is less dense than water. true or false
Answer:
true if it is less dense than the liquid its in it will float
Explanation:
Answer: The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.
so yes it will float
which factor does mass depend
Answer:
weight gravitational force
Explanation:
I hope it helps you
Answer:
mass depends on acceleration due to gravity and weight
w=mg
m=w/g
energy transformation in wound spring of a toy car?
give your own answrr
Answer:
The work done in winding the spring gets stored in the wound up spring in the form of elastic potential energy (i.e potential energy due to change in shape). ... During this process, the potential energy stored in it gets converted to kinetic energy. This turns the wheels of the toy car.
Explanation:
Answer:
Both elastic potential energy and kinetic energy at t initial are converted to internal energy t f.
Explanation:
Apply the principle of Conservation of Energy to the system, where friction is present. Between t i and t f, the elastic potential energy in the spring and the kinetic energy of motion are being transformed into internal energy.
(I can't put t and f together because it got censored so that's why there is a space. Usually they are together.)
Imagine you are dating a mineral sample that contains one-eighth of its original parent isotope. What is the
absolute age of the sample if the half-life of the parent isotope is 15 years?
A. 1.875 years
B. 23 years
C. 45 years
D. 120 years
Answer:
c
3 half lifes have passed to get to 1/8
1/2 then 1/4 then 1/8
so 15*3
Explanation:
what is acceleration?
Answer:
Acceleration is the rate of change of velocity.
Behaviors never come back once they have been extinguished. Please select the best answer from the choices provided T F
Answer:
False.
Explanation:
Behavior modification is a therapeutic process that is focused on changing any undesirable negative behavior in an individual through the use of positive or negative consequence and biofeedback.
This simply means that, behavior modification typically involves the process in which a desired behavior is reinforced while withholding reinforcement for any undesired behaviors.
Behavior modification is typically based on operant conditioning principles, through negative or positive reinforcement, undesirable behaviors developed by an individual are mainly replaced with more desirable ones.
Hence, behavior modification can be used to correct human behaviors or disorders such as enuresis (bed-wetting), Obsessive-Compulsive Disorder (OCD), generalized anxiety disorder, Attention-Deficit/Hyperactivity Disorder (ADHD), phobias, etc.
However, behaviors can still come back or be exhibited by an individual even if they have been extinguished through operant conditioning.
Operant conditioning can be defined as an associative learning process which involves reinforcing the strength of a behavior.
Answer:
Flase
Explanation:
edge2021
If you stand 50 cm from a plane mirror, where is your image?
Answer:
100 cm away from you
Explanation:
Found a good example demonstrating this problem I think:
A 2.2 kg rat floating in space pushes a piece of cheese away from himself at 10 m/s. The cheese has a mass of 1.1 kg. What is the velocity of the rat after he pushes the piece of cheese?
20 m/s
5 m/s
10 m/s
The rat doesn't move
Answer:
The velocity of the rat after he pushes the cheese is 5 m/s
Explanation:
The question relates to the Law of conservation of linear momentum, which states that the total momentum in an isolated system is constant
The given parameters are;
The mass of the rat, floating, m₁ = 2.2 kg
The velocity with which the rat pushes the cheese away from himself, v₃ = 10 m/s = The final velocity of the cheese
The mass of the cheese, m₂ = 1.1 kg
Assuming that the initial velocity of the rat, v₁ = The initial velocity of the rat, v₂ = 0 m/s
Let, 'v₄', represent the velocity of the rat after he pushes the cheese, by the law of conservation of linear momentum we have;
The total initial momentum = The total final momentum
The total initial momentum = m₁·v₁ + m₂×v₂ = 2.2 kg × 0 m/s + 1.1 kg × 0 m/s = 0 kg·m/s
The total initial momentum = 0 kg·m/s
The total final momentum = m₁·v₄ + m₂×v₃ = 2.2 kg × v₄ + 1.1 kg × 10 m/s = 2.2·v₄ kg·m/s + 11 kg·m/s
The total final momentum = 2.2·v₄ kg·m/s + 11 kg·m/s
By the equality of the total initial momentum and the total final momentum, we have;
0 kg·m/s = 0 = 2.2·v₄ kg·m/s + 11 kg·m/s
2.2·v₄ kg·m/s + 11 kg·m/s = 0
2.2·v₄ kg·m/s = -11 kg·m/s
v₄ = -11 kg·m/s/(2.2 kg·m/s) = 5 m/s
The velocity of the rat after he pushes the cheese = v₄ = 5 m/s.
Would this circuit be parallel or series?
It would be a parallel circuit.
A woman does 200 j of work on a shopping cart as she pushes it down an aisle that is 20 m long. What was magnitude of the force she applied to the cart?
Answer:
10N
Explanation:
Given data
Work done = 200J
distance= 20m
We want to find the applied force
From
Work done= Force * distance
substitute
200= F*20
F= 200/20
F= 10N
Hence the force applied is 10N
Potential difference definition
Answer:
work done to move a charge from one point to another point is known as potential difference between the points
If the speed of an object does NOT change, the object is traveling at __________ speed.
If the speed of an object does NOT change, the object is traveling at uniform speed.
Answer:
answer is uniform
Explanation:
8-30-2018 what phase change occurs as the substance at 0 degree c has its pressure dropped from 0.50 at to 0.25 atm
Answer:
at T = 0ºC the change of state is from the solid state to the gaseous state
Explanation:
In this exercise we are asked about the changes of state, from the data we will assume that the material is water.
Water can exist in three solid states, liquid and gas, in a graph of pressure ℗ against temperature (T) there is a point called triple at T = 0.01ºC, below this point the curve has two states at high pressure solid and low pressure gas.
As a result of the previous ones at T = 0ºC the change of state is from the solid state to the gaseous state
Physical quantity are measurable quantities
Answer:
yeah physical quantities are the quantities which can be meaured
A bromine atom has an atomic number of 35 and an atomic mass of 80.
What is the structure of this atom?
A. It has a central nucleus composed of 45 protons and 35 neutrons,
surrounded by an electron cloud containing 35 electrons.
O B. It has a central nucleus composed of 35 protons and 80 neutrons,
surrounded by an electron cloud containing 35 electrons.
C. It has a central nucleus composed of 35 protons and 35 neutrons,
surrounded by an electron cloud containing 45 electrons.
D. It has a central nucleus composed of 35 protons and 45 neutrons,
surrounded by an electron cloud containing 35 electrons.
The number of electrons is the atomic number of an atom. It is equal to the number of protons as well. Bromine has a central nucleus composed of 35 protons and 45 neutrons, surrounded by an electron cloud containing 35 electrons.
What is bromine?Bromine is 35th element in periodic table. It is a non-metal in the 17th group known as halogen family. Bromine is relatively electronegative and forms ionic compounds with metals.
The atomic number of an atom is the number of electrons in its neutral state. In a neutral atom the number of electrons and protons are equal. Mass number of an atom is the sum of number of protons and neutrons.
Atomic number of Br is 80. Hence, the number of electrons and protons in it is 35. Its mass number is 80. Thus, number of neutrons is 80 - 35 = 45. Thus, option D is correct.
Find more on bromine:
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A 10 kg package is delivered to your house.
Use one complete sentence to describe an example of how work is done on the package as it gets brought inside.
Make sure to use proper spelling, grammar, and other language mechanics.
In your explanation, make sure to use the terms related to the formula for work (W = Fd). EEEK pls help !!!
in December which will have a longer day length a country im notheren hemisphere or southern hemisphere
Answer:
Southern Hemisphere
Explanation:
Giving lots of points
All of the devices below either use or produce electrical energy. Which one converts mechanical energy to electrical energy?
E.Battery
F.Electrical drill
G.Wind turbine
H.Electric guitar
Answer:
wind turbine
Explanation:
Answer:
g wind turbine
Explanation:
look up the song dancing in the sky
A bucket tied to a rope is moving at a constant speed of 5.0 m/s in a circle of radius
2.0 m. Calculate the approximate magnitude of the centripetal acceleration of the bucket.
The below answer choices are in m/s^2
A.) 2.5
B.) 6.2
C.) 12.5
D. None of these
Answer:
[tex]a=12.5\ m/s^2[/tex]
Explanation:
Given that,
The speed of the bucket tied to a rope, v = 5 m/s
The radius of the circle, r =2 m
We need to find the magnitude of the centripetal acceleration of the bucket. The formula for the centripetal acceleration is given by :
[tex]a=\dfrac{v^2}{r}\\\\a=\dfrac{(5)^2}{2}\\\\a=12.5\ m/s^2[/tex]
So, the centripetal acceleration of the bucket is [tex]12.5\ m/s^2[/tex].
The three vehicles shown below are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity.
The pickup trick has a changing velocity
Because the pickup truck is __________.
Answer: its slowing down
Explanation:
The car is slowing down because its on the corner of the track.
If it were to go the same speed the other cars are going while on the straight part of the track it would go off the track therefore the car must slow down to stay in the race
The pickup truck has a changing velocity as it is slowing down. This is because the truck is on the corner of the truck.
What is the reason for changing velocity?
An object can change its velocity in a number of different ways as it can slow down, it can speed up, or it can change its direction of motion. A change in the speed, or a change in the direction of motion, or a change in both the speed and direction of motion of the object means that the object has an overall change in velocity.
The pickup truck is slowing down because it is on the corner of the track. If it were to go on with the same speed as the other cars are going in the direction while on the straight path of the track it would go off the track and therefore the car must slow down to stay in the race of vehicles.
Learn more about Velocity here:
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Tiny droplets of water collect in the air as water vapor becomes liquid water. This process in the water cycle is called...
Answer:Condensation
Explanation:
Answer:
Condensation
Explanation:
Condensation is the process by which water vapor in the air is changed into liquid water.
"Water vapor"
"Becomes"
"Liquid water"
The water vapor converted into liquid water, which is the process of condensation.
Hope it helped!
Have a supercalifragilisticexpialidocious day!
