The velocity of the male skater is 2.5 m/s in opposite to the direction of the female skater moving.
What is the law of conservation of momentum?According to the law of conservation of momentum, The overall momentum of two or more bodies acting on one another in an isolated system stays constant unless an external force is introduced. As a result, momentum cannot be gained or lost.
Given parameters:
The mass of the male ice skater is: M = 62 kg.
The mass of the female ice skater is: m = 42 kg.
Initially both of them are in rest.
After they push off each other and move in opposite directions, the female skater moves backwards with a speed of v =3.7 m/s.
Let the speed of the male ice skater is V m/s now.
From the law of conservation of momentum:
MV + mv = 0
V = - mv/M
= - (42×3.7)/62 m/s
= - 2.5 m/s
Hence, the velocity of the male skater is 2.5 m/s in opposite to the direction of the female skater moving.
Learn more about momentum here:
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Making a forecast of what will happen in the future based on past experience or evidence is called
a.
observing.
c.
predicting.
b.
inferring.
d.
classifying.
Answer: c
Explanation:
A una temperatura de 329°K una placa de aluminio tiene un área de 15 m2, si su temperatura disminuye hasta 288°K; ¿Cuál es el valor de su área final?
Answer:
El área final de la placa de aluminio es 14.971 metros cuadrados.
Explanation:
Para pequeñas deformaciones, la expresión para la dilatación de área es la siguiente:
[tex]A_{f} = A_{o} \cdot [1+2\cdot \alpha \cdot (T_{f}-T_{o})][/tex] (1)
Donde:
[tex]A_{o}[/tex], [tex]A_{f}[/tex] - Áreas inicial y final de la placa, medidas en metros cuadrados.
[tex]\alpha[/tex] - Coeficiente de expansión lineal, medido en [tex]\frac{1}{K}[/tex].
[tex]T_{o}[/tex], [tex]T_{f}[/tex] - Temperaturas inicial y final de la placa, medidas en Kelvin.
Si sabemos que [tex]A_{o} = 15\,m^{2}[/tex], [tex]\alpha = 23\times 10^{-6}\,\frac{1}{K}[/tex], [tex]T_{o} = 329\,K[/tex] y [tex]T_{f} = 288\,K[/tex], entonces el área final de la placa es:
[tex]A_{f} = (15\,m^{2})\cdot \left[1+2\cdot \left(23\times 10^{-6}\,\frac{1}{K} \right)\cdot (288\,K-329\,K)\right][/tex]
[tex]A_{f} = 14.971\,m^{2}[/tex]
El área final de la placa de aluminio es 14.971 metros cuadrados.
I need help immediately and thank you of if you answer the question
Answer:
c. Position C
Explanation:
As the magnetic force is the strongest at the end of the poles and it decreases when it comes to its centre.
HOW MANY SIGNIFICANT FIGURES ARE THERE IN THE NUMBER 405,000?
Answer:
Three, but see below.
Explanation:
You can be certain of three, but that may not be true at all. The only way to know for certain is to put it into scientific notation.
4.05 * 10^5 would be three, but other answers are possible. For example
4.050 * 10^5 would have 4.
SOME ONE PLZ HELP WILL GIVE THE BRAINIEST
Answer:
I. 90%
II. 60 MW
Explanation:
From the question given above, the following data were obtained:
Power input = 600 MW
Power output = 540 MW
I. Determination of the efficiency.
Power input = 600 MW
Power output = 540 MW
Efficiency =?
Efficiency = output / input × 100
Efficiency = 540 / 600 × 100
Efficiency = 90%
II. Determination of the power wasted by the pump.
Power input = 600 MW
Power output = 540 MW
Power wasted =?
Power wasted = Power input – Power output
Power wasted = 600 – 540
Power wasted = 60 MW
Water is considered to be
Answer: the thing that brings you life- h2o- idrk the question but if this helps your welcome ^-^have a good day
Explanation:
A 50 kg bumper car with a 40 kg child and it is at rest when a 60 kg child in her own bumper car slams into it the collision last point1 seconds and the rubber bumpers are perfectly bouncy with no heating from the collision what is the force experienced by the first car
Answer:
F = 99 v₂₀
v₂₀ = 1 m / s, F = 99 N
Explanation:
In this exercise it is asked to find the force during the collision, for this we use the relationship between the momentum and the momentum of car 1
I = Δp
F t = p_f- p₀
F t = m (v_f -v₀) (1)
We must find the final speed of car 1, for this we define a system formed by the two cars, in this case the forces during the collision are internal and the moment is conserved
initial instant. Before the crash
p₀ = 0 + m₂ v₂₀
final instant. After the crash
p_f = m₁ v₁ + m₂ v_{2f}
the moment is preserved
p₀ = p_f
m₂ v₂₀ = m₁ v_{1f} + m₂ v_{2f} (2)
m₂ (v₂₀ - v_2f}) = m₁ v_{1f}
as the collision is elastic the kinetic energy is also conserved
K₀ = K_f
½ m₂ v₂₀² = ½ m₁ v_{1f}² + ½ m₂ v_{2f}²
m₂ (v₂₀² -v_{2f}²) = m₁ v_{1f}²
let's write our system of equations, using
a² - b² = (a + b) (a-b)
m₂ (v₂₀ - v_{2f}) = m₁ v_{1f}
m₂ (v₂₀ -v_{2f}) (v₂₀ + v_{2f}) = m₁ v_{1f}²
to solve we divide the equations
v₂₀ + v_{2f} = v_{1f}
with this we substitute in equation 2 and find the speed of each car, in this case we need the speed of car 1
m₂ v₂₀ = m₁ v_{1f} + m₂ (v_{1f}-v₂₀)
2m₂ v₂₀ = (m₁ + m₂) v_{1f}
v_{1f} = [tex]\frac{2m_2}{m_1+m_2} v_{2o}[/tex]
We substitute in the drive ratio of car 1
F t = m (v_f -v₀)
F = m₁ (\frac{2m_2}{m_1+m_2} v_{2o} - 0) / t
F = [tex]\frac{2m_1 m_2 }{m_1+m_2} \ \frac{v_{2o}}{t}[/tex]
the mass of each car is the mass of the car plus the mass of the boy
m₁ = 50 +40 = 90 kg
m₂ = 50 +60 = 110 kg
time is t = 1
we substitute the values
F = [tex]\frac{ 2\ 90 \ 110}{90+110} \ \frac{v_{2o}}{1}[/tex]2 90 100/90 + 110 vo2 / 1
F = 99 v₂₀
The value of the initial velocity of car 2 is not indicated in the problem, if this velocity is known it can be included and the force value is obtained, suppose that the initial velocity v₂₀ = 1 m / s
F = 99 N
Ep = mxgx h. Re-arrange to give an equation for:
a) The mass m.
b) The gravitational field strength g.
c) The height h.
Answer:
Ep=mxgxh.
a) m=ep/gxh
b) g=ep/m/h
c)h=ep/mxg
Answer:
Ep=mgh
Ep/gh=mgh/gh
Ep/gh=m
Directed Reading for Overview
Content Mastery
Forces and Newton's Laws
Directions: Complete the concept map using the terms listed below.
pushes and pulls
Newton's Laws
inertia
acceleration
unbalanced
mass
pairs
gravity
1.
and
forces
such as
when they are
7.
2.
they
generate
which is a
force of
attraction
motion
between two
objects with
can be measure by
4.
8.
3.
describes
which is a
measure
of
relates force,
mass and
describes
forces in
5.
6.
Why do farmers need to use strategies like crop rotation?
Answer:
Crops drain the soil of nutrients
Explanation:
i took the test:) yw
Please write ONE complete sentence describing the relationship between Kinetic Energy and Gravitational Potential Energy in a system
where energy is conserved:
Answer:
Explanation:
The sum of kinetic and potential energy is the mechanical energy of the system. Assuming the energy of the system is conserved, which it is in your case, then the initial mechanical energy will equal the final mechanical energy. This relationship is very useful in mechanics.
an apple falls from the top of the tree and takes 2 secs to hit the ground.
how far did the apple fall?
calculate the velocity of the apple just before it hits the ground.
is 468km per minute describing speed or velocity
Please help!! This is due today!!
A shopping bag can provide a force of 65 N before breaking. A shopper puts 5 kg of groceries in the bag. If the shopper tries to lift the bag with an upward acceleration of 2 m/s/s, will the bag break?
Why does a ball not bounce back up to its original height?
Answer:
Gravity
Explanation:
how many electrons does a neutral atom of the element oxygen have?
Answer:
8 electrons
Explanation:
Now you can figure out how many electrons, protons and neutrons Oxygen has: Atomic number (which is always the smaller of the two numbers) is 8. Hence 8 protons. Because the atom is neutral, there are also 8 electrons.
What is the metric system of 1.0km to mm
Answer:
1 kilometer is equivalent to 1,000,000 <(million) millimeters
The gravitational potential energy decreases and the kinetic energy increases. The gravitational potential energy is transformed into kinetic energy as the ball rolls down the ramp.
A. The gravitational potential energy decreases and the kinetic energy increases. The gravitational potential energy is transformed into kinetic energy as the ball rolls down the ramp.
B. The gravitational potential energy decreases and the kinetic energy increases.As soon as the ball starts moving it no longer has gravitational potential energy; it has only kinetic energy.
C. The kinetic energy and and gravitational potential energy both decrease. Both forms of energy are used up as the ball moves and are not transformed into any other form of energy.
D. The gravitational potential energy and the kinetic energy both stay the same. One form of energy cannot be transformed into a different form of energy.
Answer:
The gravitational potential energy decreases and the kinetic energy increases. The gravitational potential energy is transformed into kinetic energy as the ball rolls down the ramp.
Explanation:
The gravitational potential energy is the energy due to the position of a body above the ground.
Kinetic energy is the energy due to the motion of a body.
From the law of conservation of energy "energy is neither created nor destroyed but transformed from one form to another".
As the ball rolls down the ramp, the potential energy at the height is converted to kinetic energy.
Study the image below.
A straw in a glass of water. The straw appear to be broken and shifted at the top of the water.
The straw appears to "bend" because of
Answer:
Study the image below.
A straw in a glass of water. The straw appear to be broken and shifted at the top of the water.
The straw appears to "bend" because of
✔ refraction.
Explanation:
Study the image below.
A straw in a glass of water. The straw appear to be broken and shifted at the top of the water.
The straw appears to "bend" because of
✔Study the image below.
A straw in a glass of water. The straw appear to be broken and shifted at the top of the water.
The straw appears to "bend" because of
✔. refraction
.
You drop a rock down a well that is 31 m deep. How long does it take the rock
to hit the bottom of the well?
A. 1.9 s
B. 2.7 s
C. 6.3 s
D. 2.5 s
Help ASAP
Frank uses a bowling ball to demonstrate how energy can cause changes. Which
of the following actions would NOT demonstrate a change caused by applying
energy to the ball?
O He spins the bowling ball with one hand
O He rolls the bowling ball across the floor
O He holds the bowling ball in both hands
He lifts the bowling ball to place it on a shelf.
Answer:
he holds the ball in both hands
Explanation:
he's not moving the ball
When the chemical name of a compound is being written, the subscripts will determine the symbols. elements. prefixes. suffixes.When the chemical name of a compound is being written, the subscripts will determine the symbols. elements. prefixes. suffixes.
Answer:
C. Prefixes
Explanation:
I took the quiz on edge
Answer:
C is correcting taking test now
Explanation:
Please help!!!
What do all of the inventors discussed in this lesson have in common?
All of the inventors can be characterized as problem-solvers.
O All of the inventors created new things as children.
All of the inventors used engineering principles to create new things.
O All of the inventors needed mathematics principles to formulate solutions.
Answer:
All of the inventors can be characterized as problem-solvers.
Explanation:
Took the practice
Answer:
All of the inventors can be characterized as problem-solvers.
Explanation:
what is the magnitude of velocity for a 1500 kg car possessing 4500 kgm/s of momentum?
What is the density of an object with the mass of 125g and a volume of 176 m
Answer:
the density is mass over volume, so you divide 125g over 25 cm3, giving a result of 5 g/cm3
Answer:
The density is mass over volume
so you divide 125g over 25 cm3
giving a result of 5 g/cm3
you welcome have a good day!
When a pressure is applied to an object, the volume of the object:
a. stays the same
b. increases
c. decreases
Answer:
C because at higher altitude the air density becomes smaller
Help me with this please everyone e
Answer:
false I wouldn't say its a consequence.
calculate the acceleration due to gravity on the International Space Station (which orbits at a distance of 408,000 m)
Answer:
none
Explanation:
none cause it's in space
pls help brainliest if correct
Hmm lets see.. I think its
Mechanical---->Mechanical---->Electrical
So mechanical from the water, Then mechanical again from the wheel then through the wire which is electrical and it turns the fan on.
What is the speed of a runner that runs 400m in 48.42 seconds?
Answer:
The speed is that it would take 121.05 seconds to run a kilometer.
Explanation:
Since there are 1000 meters in a kilometer, divide 400 meters by 4, and 48.42 by 4. Then you get 100 meters equals 12.105 seconds. Multiply that by ten, and you get 121.05 seconds
