Answer:
speed = distance/time
just find the speed if it
block a of mass 4m is attached by a light string to block b of mass 2m. the string passes over a pulley with negligible friction and of negligible mass. block a is held a distance h above the ground, as shown. the blocks are released from rest, and block a reaches the ground two seconds later. the value of h is most nearly
The kinematics and Newton's second law allow us to find the height from which the block system descends is:
y = 6.54 m
Given parameters
Body mass m1 = 4 kg The mass of the body on the ground m² = 2 kg The descent time t = 2sTo find
Body height
Newton's second law gives a relationship between the net force, the mass, and the acceleration of the body.
∑ F = m a
Where the bold letters indicate vectors, F is the force, m the mass and the acceleration of the body.
Kinematics studies the movement of bodies, looking for relationships between position, velocity and acceleration
y = v₀ t + ½ a t²
In the attached we have a free body diagram of the system, let's write Newton's second law.
T - W₁ = m₁ a
-T + W₂ = m₂ a
Let's solve the system of equations.
W₂ - W₁ = (m₁ + m₂) a
a = [tex]\frac{m_2-m_1}{m_2+m_1} \ g[/tex]
Let's calculate
a = [tex]\frac{2 -4}{ 2 +4} \ 9.8[/tex]
a = -3.27 m / s²
The negative sign indicates that the heaviest body is descending.
Now we can use kinematics to find the height, as the system comes out of rest the initial velocity is zero, when he reaches the ground his height is zero.
y = y₀ + v₀ t + ½ a t²
0= y₀ + 0 +½ a t²
Let's calculate
y₀ = ½ 3.27 2²
y = 6.54 m
In conclusion, using kinematics and Newton's second law we can find the height from which the block system descends is:
y = 6.54 m
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PLEASE ANSWER NEED HELP!!!!!!!! PLEASE THE CORRECT ANSWER!!!!!!
Eduardo has always been a little self-conscious about his nose, which is quite prominent. Many members of his family have similar features, but that does not make Eduardo like it any better. What would be a body positive approach?
A.
to look into surgery to alter the shape of his nose
B.
to accept and appreciate his features for what they are
C.
to choose another part of his body to work on changing
D.
to compare himself to more successful people with different features
PLEASE NO LINKS
Answer:
I think the correct answer is B
What is the force of gravity on Earth in Newton's?
Answer:
9.8 meters/second^2
Explanation:
formula: Fg=mg
Question 9 (10 points)
✓ Saved
3
Listen
A man is whirling a 0.25 kg ball on a 1.5 m long string at 3 m/s. Find the centripetal force acting on this ball.
6
O0. 13 N
9
20. 5 N
O1.5 N
03.4 N
Answer:
C 01.5
i calculated and it was right
pls ignore the first answer
it was mistake
What type of energy transformation is demonstrated in the above diagram?
A. heat energy to light energy
B. solar energy to heat energy
C. chemical energy to heat energy
D. heat energy to electrical energy
Answer:
C :)
Explanation:
Trust me
Energy transformation is demonstrated in the diagram is solar energy to heat energy.
What is energy?Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
Solar radiation is absorbed at the surface of a receiver, which includes oris in touch with flow passageways through which a working fluid moves, during thermal conversion operations. Heat is delivered from the heating receiver to the working fluid, which might be air, water, oil, or molten salt.
Energy transformation is demonstrated in the diagram is solar energy to heat energy.
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What affects weathering rates
Rainfall and temperature can affect the rate in which rocks weather. High temperatures and greater rainfall increase the rate of chemical weathering. 2. Rocks in tropical regions exposed to abundant rainfall and hot temperatures weather much faster than similar rocks residing in cold, dry regions.
Name Jenner
Projectile Motion Test
Brad kicked a soccer ball as hard as he could. The ball landed
40 meters away from where he kicked it. The ball was in the
air for 8 seconds.
Answer:
so i can only help u with what u give me.i think this is a math problem so the answer would be....the ball traveled 5 meters per sec
Francesca and Maricruz are walking to Kroger to buy some juice. They walk 3000 meters in 900 seconds. What was their average speed in km/h?
Answer:
3000m in 900 s
which means 1km/1hour=1000m/3600s=5/18
3000/900*5/18
1.6kmph
Explanation:
CAN I GET BRAINLIEST
When nonmetals such as nitrogen and phosphorus are solids, they tend to be?
A
brittle
B
dense.
С
malleable
D
shiny
Answer:
answer is A hope this helps
Explanation:
According to the characteristics of non-metals such as nitrogen and phosphorous which are solids they are also brittle.
What are the characteristics of non-metals?Non-metals do not possess luster and are dull . They are not malleable and ductile and are soft due to the covalent bonding present in them . Non-metals on the other hand owing to their soft nature have low melting points.
Non-metals have four to seven valence electrons owing to which they usually form covalent bonds. They are poor conductors of heat and electricity and are mostly in liquid or gaseous state.They are widely used in the manufacture of fertilizers , in rocket fuels and in the form of graphite in pencil leads.
Non-metals have high ionization energies and high electronegativities.
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Gambar berikut menunjukan lintasan sebuah proyektil yang di tembakkan dengan kecepatan horizontal v dari atas gedung setinggi h. Nilai untuk v dan h berikut yang akan menghasilkan θ terbesar adalah
Answer:
Yes
Explanation:
Thank you
Please help if you can!
Answer:
Illuminated
Explanation:
I think but not sure
Water near the surface of a swimming pool is slightly warmer than the water at the bottom. The warm water rises because of ....
a. conduction
b. convection
c. radiation
d. contraction
Answer:
B. Convection
Explanation:
I hope this helped!
Answer:
convection
Explanation:
warm air rises when conevetion happens so thats the answer
9
1 point
A girl throws a football with an average velocity of 18.5 m/s a distance of 52.1 m. How long does it take the ball to cross that distance?
Time = distance / velocity
52.1 meters / 18.5 m/s = 2.82 secondsT
Suppose two equal mass cars traveling with equal speeds in opposite directions inelasticcollide head on and stick together. What fraction of the energy is dissipated
A collision which is inelastic is one in which the internal energy changes.
All the kinetic energy is dissipated
Reasons:
The given parameters are;
The mass of one car = The mass of the second car in the collision = m
The type of collision = Inelastic collision
The speed of each of the cars in the collision = v and -v
Solution:
In an inelastic collision, we have;
[tex]m_1 \cdot v_{1i} + m_2 \cdot v_{2i} = (m_1 + m_2) \cdot v_f[/tex]
Therefore, we get;
[tex]m \cdot v_{i} -m \cdot v_{i} = 0= 2 \cdot m \cdot v_f[/tex]
Which gives;
[tex]v_f = 0[/tex]
The collision is an example of a perfectly inelastic collision, and the final velocity after the collision is zero.
The change in the energy is [tex]\Delta K.E. = K.E._{final} - K.E._{initial}[/tex]
[tex]K.E._{initial}[/tex] = 0.5·m·v² + 0.5·m·v² = m·v²
ΔK.E. = 0.5·(2·m)×0 - 0.5·m·v² + 0.5·m·v² = -m·v²
ΔK.E. = -m·v²
The negative sign stands for energy given out, which gives;
The energy dissipated = m·v² (The total initial kinetic energy)
Therefore, all the kinetic energy is dissipated
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We are able to understand body weight and usually start wanting to "grow up" at 10 years old. OA. True ОВ. False
Answer:
true
Explanation:
for some I different some start at 9
A 1.8 kg book has been dropped from the top of the football stadium. Its speed is 4.8 m/s when it is 2.9 meters above the ground?
Answer:
71.89 Joules.
Explanation:
describe the appearance of the substance before the phase change?
Answer:when matter changes to from one state (solid, liquid, gas, plasma) to another
Explanation:
L4 M-9 T-6 J9 . L-2 M-6 T-3 J-3
???
Radio waves and gamma rays traveling in space have the same...
Answer:
Radio waves and gamma rays traveling in space have the same speed in free space.
Hope this helps!!
Radio and Gamma rays travel with the same speed in free space.
What are Radio and Gamma waves ?"Both are electromagnetic waves. Both the waves travel with the speed 3 x 10^8 m/s in free space. Radio waves have low frequency but high wavelength. Gamma waves have very high frequency but small wavelength. Hence Radio and Gamma waves both travel with the same speed in free space."
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what makes something magnetic?
please help me I don’t understand
Answer:
A and B are false.
C and D are plausible. I would bet on D.
8 kg cat is running with a velocity of 4 m/s. What is the cat's momentum?
Answer:
Kinetic energy = (1/2) (mass) (speed)²
Kinetic energy = (1/2) (8 kg) (4 m/s)² =
(4 kg) (16 m²/s²) =
64 (kg-m/s²) (m) = 64 newton-m = 64 joules
A cat of mass 8 kg moving with a velocity of 4 m/s, then the momentum of the cat's movement will be equal to 32 kg m/s.
What is momentum?The momentum is the result of a particle's velocity and its mass. Force and motion, meaning it has both magnitude and the direction. According to Isaac Newton's second equation of motion, the force acting on a particle equals the time rate of increase of momentum.
The impulse, which is the product of the force and the intervals (the impulse), is equal to the difference in momentum, according to Newton's 2nd law, if a steady force operates on a particle for a specific amount of time. On the other hand, a particle's momentum is the amount of time needed for a consistent action to fight it to rest.
As per the data provided in the question,
Mass of the cat, m = 8 kg
Velocity of the cat, v = 4 m/s.
[tex]Momentum(p) = Mass(m)*velocity(v)[/tex]
p = (8 kg) × (4 m/s)
p = 32 kg m/s.
Therefore, the momentum of the cat is 32 kg m/s.
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Amelia is writing an explanation of the difference between potential and kinetic
energy. Which of the following would be an example Amelia could use to represent
potential energy?
O A swing moving back and forth
O A soccer ball sitting on top of a hill
O A hot air balloon rising slowly
O A car traveling down the road
A soccer ball sitting on top of a hill.
Kinetic energy is energy that possesses due to its motion. Basically, a moving object has kinetic energy.
Potential energy is the energy held by an object due to its position relative to other object. Which means it has the possibility (potential) to become kinetic energy, but at that moment where it’s not moving, it’s potential energy.
Copernicus believed the planetary motions were due to:
circular heliocentric orbits
elliptical heliocentric orbits
elliptical geocentric orbits
circular geocentric orbits
(a) circular heliocentric orbits
Copernicus's model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds.
Answer:
Copernicus's model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds.
Explanation:
Question 1
Analyze this: A rightward force of 80 N is applied to a 5.00 kg object to accelerate it to the right. The friction force
between the object and the surface is 30 N. Complete the diagram
The only part of the diagram that remains is the force that moves the object forward which is 50 N.
We know that the net force is obtained using the relation;
Net force = -Frictional force + Rightward force
The frictional force is negative because its direction is opposite to that of the forward force.
We have the following information from the question;
Frictional force = 30 N
Rightward force = 80 N
Mass = 5.00 kg
Net force is obtained from;
5a = 80 - 30
5a = 50
a = 10 m/s^2
Net force = 50 N, This the force that moves the object forward.
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Referring to the diagram in Sample Problem 2.8, determine the speed at points C and D.
Which kind of boundary is caused by unequal density of the tectonic
plates? *
5 points
What is it ?
Answer:
Convergent plate boundaries
Explanation:
if they are of unequal density, One plate usually sinks beneath the other in a subduction zone.
what can electromagnetic waves travel through that mechanical waves can not travel through?
Answer:
I believe it is vacuum of space
Explanation:
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
The method of measuring distance in space using parallax is equivalent to surveyors on Earth doing _______________. The smaller the parallax of an object, the greater its __________. When we measure parallax, the distance between the two observers (or two vantage points) is called the ___________. The first parallax to a star was not measured until 1838 because the stars are so _______________. The distance at which a star has a parallax of one second of arc is called a __________. In 1989, astronomers launched a satellite called __________ to measure parallax even better from outer space.
Answer:
Triangulation
Distance
Baseline
Far away
Parsec
Hipparcos
Astronomers are known to estimate the distance of nearby objects in space through the use of stellar parallax, or trigonometric parallax.
They often measure a star's movement using the background of more distant stars as Earth revolves around the sun.
With the use of Parallax, one can get the best way to have the distance in astronomy,
Triangulation is often used instead of parallax to know the terrestrial distances by forming triangles with a predefined base and measuring the angles formed with the other two sides.
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A 1000 kg race car rounds a curve with a radius of 50 m.
Find the magnitude of the centripetal force acting on the car
when it rounds the curve at 15 m/s.
Answer:
5644556677888777766554433
