Answer: It was important when the Sun was forming from a shrinking interstellar cloud of gas.
Hope this helps!!
This process is thought to have been the main source of energy for the sun in the early stages of its development before nuclear fusion reactions in the sun's core became the dominant source of energy.
What is Gravitational contraction?Gravitational contraction is the process by which a celestial body, such as a star, generates energy through the release of gravitational potential energy as it contracts and becomes denser.
Here,
This process is thought to have been the main source of energy for the sun in the early stages of its development before nuclear fusion reactions in the sun's core became the dominant source of energy.
As the sun contracted and became denser, the temperature and pressure in its core increased, leading to the initiation of nuclear fusion reactions. These reactions transformed hydrogen into helium and released a tremendous amount of energy in the form of light and heat, which has sustained the sun for billions of years.
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A woman in a sprint race accelerates from rest to 8.7 m/s in 2.7 s. What is her displacement?
Answer:
23.49m
Explanation:
Distance = velocity x time
8.7 x 2.7 = 23.49m
suppose that we attach velcro® to the non-magnetic ends of the two carts in the video and remove the mass bars, so that both carts have the same mass. we repeat the experiment shown in the video, and the carts stick together after they collide. if the launch cart travels at a speed v0, then how fast will the combined two-cart system travel after the collision?
The momentum conservation allows to find the final speed of the cars together are:
If the second car is stopped, the final speed is: v = vo / 2 If the second car moves towards the first, the final speed is: v = 0
The momentum is defined by the product of the mass and the speed of the body.
p = m v
Where the bold letters indicate vector, p is the moment, m is the mass and v the velocity.
If we define the system as formed by the two bodies, the forces during the collision are internal and the momentum is preserved, let's find the moment in two instants.
Initial instant. Before crash.
p₀ = m v₀₀₀+ m v₀₂
Final moment. After the crash.
[tex]p_f = 2m \ v[/tex]
The moment is preserved.
[tex]p_o =p_f \\m v_o + m v_o_2 = 2m \ v[/tex]
[tex]v = \frac{m v_o + v_o_2}{2m}\\ v = \frac{1}{2} \ ( v_o + v_o_2)[/tex]
We have two cases:
That the second car is initially stopped, therefore the speed is zerov = v₀ / 2
That the second car move towards the first with velocity v₀₂ = - vov = 0
In conclusion using the momentum conservation we can find the final velocity of the cars together are:
If the second car is stopped, The final speed is: v = vo / 2 If the second car moves towards the first, the final speed is: v = 0
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A 700 g block is released from rest at height h0 above a vertical spring with spring constant k ! 400 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.0 cm. How much work is done (a) by the block on the spring and (b) by the spring on the block
The work done by the block on the spring and by the spring on the block is 7.22 J.
The given parameters;
mass of the block, m = 0.7 kgspring constant, k = 400 N/mextension of the spring, x = 19 cm = 0.19 mBased on law of conservation of energy, the potential energy of the block will be converted to elastic energy of the spring, producing the given extension.
The work done by the block on the spring will be equal to work done on the block by the spring.
[tex]W = \frac{1}{2} kx^2\\\\W = \frac{1}{2} \times 400 \times 0.19^2\\\\ W = 7.22 \ J[/tex]
Thus, the work done by the block on the spring and by the spring on the block is 7.22 J.
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What is the total distance travelled? What is the displacement of the object?
What new characteristic did John Dalton add to the model of the atom?
An atom is a round, solid mass.
An atom has a massive, positive center.
An atom is made up of smaller particles.
An atom can join with other kinds of atoms.
Answer: It is matter
Explanation:
Answer:
D
Explanation:
Trust me, I just did the test. :) :) :)
138.42 g of salt water has a volume of 117.0 mL. Determine its density.
There is said to be a short circuit when
A. one part of a closed circuit has a very low resistance and almost all the current will flow through this part and very little current will flow through the other part.
B. one part of a parallel circuit has a very low resistance and almost all the current will flow through this part and very little current will flow through the other part.
C. one part of a parallel circuit has a very low resistance and very little of the current will flow through this part and almost all the current will flow through the other part.
D. one part of a closed circuit has a very low resistance and very little of the current will flow through this part and almost all the current will flow through the other part.
A short circuit is said to have occurred when two nodes of a circuit at different voltages are abnormally connected
There is said to be a short circuit when; One part of a parallel circuit has a very low resistance and almost all the current will flow through this part and very little current will flow through the other part
The correct option is option B.
Reason:
A circuit has to be closed or the the current path has to be closed for
current to flow. A short circuit occurs when current in a circuit flows
through an abnormal path, such as a bridge in a connection to a load that
creates a parallel path for current flow.
Almost all the current flows through the parallel path due to the low
resistance in the connection (almost zero) and the proximity to the power
source, thereby preventing current from reaching its intended destination
Therefore, the correct option is option B.;
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When the toaster is switched on the current is 4.0 A
The resistance of the toaster is 60 Ω
Calculate the power of the toaster.
Use the equation:
power = (current)^2 × resistance
Answer:
by using the formula it would be (4)^2 x 60 which gives 960 watt
What is the Coriolis Effect?
Question 5 options:
the circulation route of trade winds moving from east to west
the way that tropical winds circulate to form hurricanes and large storms
the rapid movement of winds found in the upper atmosphere
the curved path of global winds due to the rotation of Earth on its axis
Answer:
An effect whereby a mass moving in a rotating system experienced a force acting perpendicular to the direction of motion and to the axis of rotation.
2 H2O2-> 2H20+02
2. What are the reactants in this reaction?
3. What are the products in this reaction?
4. What happened in this particular reaction? What happens in general decomposition reaction?
Answer:
This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen. Add 2 molecules of hydrogen peroxide and 2 molecules of water. Since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.
3]Explanation: This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen. Add 2 molecules of hydrogen peroxide and 2 molecules of water. Since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.
4]Two moles of hydrogen peroxide H2O2 decomposes to produce two moles of water H2O and one mole of oxygen gas O2(g) , which then bubbles off
018 10.0 points
Salmon often jump waterfalls to reach their
breeding grounds.
Starting downstream, 1.83 m away from a
waterfall 0.332 m in height, at what minimum
speed must a salmon jumping at an angle of
43.7° leave the water to continue upstream?
The acceleration due to gravity is 9.81 m/s?.
Answer in units of m/s.
r in units of
10
100
Answer:
jfjcgufnfhfufm TV fifnricnrhkddufnfif km fgkfkvntfmrugrhfifnh r
Jason throws a ball horizontally off a 300 meter cliff at 15.0 m/s. How far will it travel before it hits the
ground? Use significant figures, and estimate g to be equal to 9.81 m/s2. Round the answer to the nearest
hundredth.
117.30 m
B
130.80 m
с
51.80 m
D
101.70 m
Answer:
117,30m
Explanation:
I think the situation here is a horizontal projection to the ground. So in order to find the distance the formula = Ut, where U is the initial speed and t is the Time of flight. To get the time of flight in this case =√2h/g where h is the height and g is gravity. so to get the time = √2×300÷9.81 =7.821 .so range =ut which is equal to the time multiplied by 15m/s =117.30m
Hi there!
To find the total distance traveled, we must find the time taken to fall down.
Ignore the horizontal velocity when dealing with the vertical direction. We can use the simplified equation:
[tex]t = \sqrt{\frac{2h}{g}{}}[/tex]
Plug in the given values:
[tex]t = \sqrt{\frac{2(300)}{9.81}} = 7.821 sec[/tex]
Use the equation:
Δd = vt
Plug in the time and horizontal velocity:
Δd = (15)(7.821) = 117.30m
NEED THIS ASAP
Does increasing mass also increase the energy transferred to another object? What is your evidence to support this claim?
Increasing mass (will / will not) increase the energy put into another object.
Answer:
Energy is essentially work done by an object or on object.
From,
W = Fd
It's directly proportional to mass.
from,
K. E = 1/2mv²
Energy is directly proportional to mass.
P. E = mgh
Energy is directly proportional to mass.
H = mc∆T
Energy is directly proportional to mass.
Thus increasing mass will increase the energy also imparted on another object since all the above eqns show that relationship.
And for 2 moving bodies
K.Ei = K.Ef(energy conservation)
m1u²1 + m2u²2 = m1v²1 + m2v²2
The relationship is the same that the greater mass the greater the impact.
Khi tia tới hợp với pháp tuyến tại điểm một góc i = 30 độ thì tia phản xạ hợp với pháp tuyến tại điểm tới một góc
A. i' = 90 độ B. i' = 45 độ
C. i' = 30 độ D. i' = 60 độ
Answer:
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If the mass were to increase 12 times, what would happen to the kinetic energy?
Answer:
Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest. Tell me if u need any more help, have a goooood dayyyyy and pls mark brainly
Explanation:
A car accelerates from 0 to 30 m/s in 8 seconds. What is its acceleration?
Answer:
3.75m/s²
Explanation:
a=v-u. then you substitute the values
t
The amount of work (W) done on an object is equal to the force (F) needed to lift
the object (the object’s weight) multiplied by the distance (d) the object is lifted: W = F ✕ d.
Use the weight of the ball that you calculated in activity B to determine how much work
would be required to lift the ball 2 meters above the zero position:
Answer:
Weight x Distance is usually shown in graph form just multiply these to find the Force. W x D = F
Other formula's.
Finding Kinetic energy with given weight 10kg
In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s 2.
Write at least on paragraph about space exploration and why it interests you.
Answer:
use Myassignmenthelp.com it's free
Three astronauts guide a 100 kg asteroid safely away from their space capsule. The first astronaut pushes with a 35 N force directed 45 degrees below the x-axis. The second astronaut pushes with a 35 N force directed 45 degrees above the -axis. The third astronaut pushes with a 35 N force along the x-axis. Calculate the magnitude of the net force exerted by the three astronauts. Calculate the rate (magnitude only) at which the asteroid's velocity changes.
The magnitude of the net force exerted by the three astronauts is 84.5 N and the rate at which the asteroid's velocity changes is 0.845 m/s².
The given parameters;
mass of the asteroid = 100 kgforce by first astronaut = 35 N, at 45 degrees below x -axisforce by second astronaut = 35 N, at 45 degrees above x-axisforce by third astronaut = 35 N, at 0 degrees on x-axisThe resultant horizontal force applied by the three astronauts on the asteroid is calculated as;
Fₓ = 35cos(45) + 35cos(45) + 35cos(0)
Fₓ = 84.5 N
The rate at which the asteroid's velocity changes is calculated as;
[tex]F = ma = m\frac{\Delta v}{\Delta t} \\\\\frac{\Delta v}{\Delta t} = \frac{F}{m} \\\\\frac{\Delta v}{\Delta t} = \frac{84.5}{100} \\\\\frac{\Delta v}{\Delta t} = 0.845 \ m/s^2[/tex]
Thus, the magnitude of the net force exerted by the three astronauts is 84.5 N and the rate at which the asteroid's velocity changes is 0.845 m/s².
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5) Match the following.
Answer:
hope helpful
Explanation:
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Which statement is a description of Charles’s law?
The temperature and volume of a gas are directly proportional when pressure is constant.
The temperature and volume of a gas are inversely proportional when pressure is constant.
The volume and pressure of a gas are directly proportional when temperature is constant.
The volume and pressure of a gas are inversely proportional when temperature is constant.
Answer:
The temperature and volume of a gas are directly proportional when pressure is constant
What force causes you to move upward when you jump into the air?
a. You push down on Earth with a force greater than your weight, so Earth pushes back on you with a force that is equal in magnitude but opposite in direction
b. You push down on Earth, and because Earth is so large, it pushes back on you with a force that is greater than the downward force you exerted on it
c.You push down on Earth, but because Earth is stationary, Earth cannot exert an upward force on you so internal forces from your muscles act on your body itself.
d.You push down on Earth, which causes it to move slightly down under your feet and give you the sensation that you have risen.
A car was going at 20m/s along a straight highway. The driver slams on the break to avoid hitting a deer. The car had a negative acceleration of -2m/s^2 How much time did it take the car to stop
A 50 N force is acting on a soccer ball that is 5 kg, what's the acceleration of the soccer ball?
Answer:
Explanation:
HCE 20 ADIASM EPEGURNTE MSIMOLO
Please help me with part 2. Will give brainliest
Hi there!
We can use the derived equation to solve:
[tex]t = \sqrt{\frac{2h}{g}}}[/tex], where:
h = height
g = acceleration due to gravity
Plug in the given values. Remember to CONVERT km to m:
32 km = 32 km * 1000 m / 1 km = 32,000 m
t = √(2(32000)/3.4) ≈ 137.199 sec
Part 2:
Use the derived equation:
vf = √2gh
vf = √(32000)(3.4) = 329.848 m/s
2.A girl of mass 50kg climbs a flight of a stair having 40steps each of 30m high in 10 s. Calculate the power developed by the girl.
Answer:
[tex]{ \boxed{ \pmb{power = \frac{force \times distance}{time} }}} \\ [/tex]
force → (50 × 10) = 500 Ndistance → (30 × 40) = 1200 mtime → 10 seconds[tex]{ \rm{power = \frac{500 \times 1200}{10} }} \\ \\ { \rm{power = \frac{600000}{10} }} \\ \\{ \underline{ \underline{ \rm{ \dashrightarrow \: \: power = 60,000 \: newtons \: \: }}}}[/tex]
please answer the question
Answer:
A safest device
Explanation:
it's meant to operate safe and provide over current protection of an electrical circuit
Temperature at which change of state occurs is... (science))
Answer: melting
Explanation: Becuse that is the science
Срочно нужно решение задания 5, пожалуйста!!!!!
what is uniform velocity
Answer:
this is the velocity
Explanation:
Uniform Velocity-A body is said to have uniform velocity if it covers equal distance in equal intervals of time in a particular direction, however, the time intervals may be small.