Explanation:
Bond Enthalpy : It is defined as amount of energy required to break a the particular bond in there gaseous state. It is also known as bond energy. It units are kJ/mol.
Breaking of a bond is an Endothermic process (energy absorbed from the surroundings).Formation of bond is an Exothermic process (energy is released to the surroundings).If the average bond enthalpy for a C-H bond is 413 kJ/mol, When the C-H bond breaks in which energy will be required ,which will be an endothermic reaction.
A ball dropped from a bridge takes three seconds to reach the water below how far is the bridge above the water?
Given that:
Ball dropped from a bridge at the rate of 3 seconds
Determine the height of fall (S) = ?
As we know that, S = ut + 1/2 ×a.t²
u =initial velocity = 0
a= g =9.81 m/s (since free fall)
S = 0+ 1/2 × 9.81 × 3²
S = 44.145 m
44.145 m far is the bridge from water
All of the following are part of sea-floor spreading EXCEPT
A. sea levels rising
B. plates moving closer together
C. magma filling in gaps in oceanic plates
D. trenches forming in the bottom of the ocean floor.
The correct answer should be A. sea levels rising should not be a part of sea-floor spreading.
Hope this helps,
Davinia.
A. sea levels rising
and thats a fact!
1. What is the speed of a rocket that travels 9,000 meters in 12.12 seconds?
2. What is the speed of a jet plane that travels 528 meters in 4 seconds?
3. How long will your trip take if you travel 350 kilometers at an average speed of 80 kilometers per hour?
4. How far (in meters) will you travel in 3 minutes running at a rate of 6 miles per second?
5. A trip to Cape Canaveral, Florida takes 10 hours. The distance is 816 kilometers. Calculate the average speed.
6. How many seconds will it take for a satellite to travel 450 kilometers at a rate of 120 miles per second?
7. What is the speed of a walking person in miles per second if the person travels 1,000 miles in 20 minutes?
8. A ball rolls down a ramp for 15 seconds. If the initial velocity of the ball was 0.8 miles per second and the final velocity was 7 miles per second, what was the acceleration of the ball?
9. A meteroid changed velocity from 1.0 kilometers per second to 1.8 kilometers per second in 0.03 seconds. What is the acceleration of the meteroid?
10. A car going 50 miles per hour accelerates to pass a truck. Five seconds later the car is going 80 miles per hour. Calculate the acceleration of the car.
11. The space shuttle releases a space telescope into orbit around the earth. The telescope goes from being stationary to travelling at a speed of 1,700 miles per second in 25 seconds. What is the acceleration of the satellite?
12. A ball is rolled at a velocity of 12 miles per second. After 36 seconds, it comes to a stop. What is the acceleration of the ball?
13. A dragster in a race accelerated from stop to 60 miles per second by the time it reached the finish line. The dragster moved in a straight line and traveled from the starting line to the finish line in 8.0 seconds. What was the acceleration of the dragster?
Gary is trying to think of an object that could model a sunspot. His teacher tells him that such an object might be found right on his face. Which of the following most closely models the behavior of a sunspot? A. an eyelash B. a freckle C. a birthmark D. a lip
the answer is B a freckle I just had this as a Study Island and got it right.
Ans. (B). a freckle.
Sunspots can be defined as temporary phenomena on the photosphere of sun, which appears as spot darker than its surrounding regions. Freckles on the face can model the behavior of sunspots are they represent spots brown spots on skin, darker than face complexion.
Freckles are resulted due to concentrated melaninized cells, having melanin (a type of skin pigment).
Thus, the correct answer is option (B).
How is the nitrogen cycle important to humans? HELP 18 mins
It produces free nitrogen that humans can breathe.
It converts nitrogen into a form that humans can obtain by eating other organisms.
It produces nitrogen compounds that humans can breathe.
It converts nitrogen into a form that humans can obtain by absorbing it through their skin.
Which processes result in the release of carbon? Check all that apply.
Animals break down food molecules to obtain energy.
The remains of producers are broken down by decomposers.
The remains of consumers are broken down by soil decomposers.
Producers take in carbon dioxide.
Producers make sugars and starches.
Which human activity would most likely decrease the amount of carbon in the atmosphere?
clearing forests
heating coal
burning
Which label belongs in the area marked Z?
take in from atmosphere
produce themselves
eat other organisms
absorb from soil
planting trees
What is the role of these bacteria in the nitrogen cycle?
to absorb nitrogen-containing compounds from the soil
to release free nitrogen into the atmosphere
to break down nitrogen-containing compounds in dead organisms
to convert free nitrogen into usable nitrogen
Which best describes the diagram?
A consumer is obtaining carbon by breathing it in from the atmosphere.
A consumer is obtaining carbon by absorbing it from the soil.
A consumer is obtaining carbon by eating carbon-based molecules stored in a producer.
A consumer is obtaining carbon by eating carbon-based molecules stored in a decomposer. Cleo has a vegetable garden and wants to increase the amount of nitrogen in the soil.
How can she most likely do this?
add several soybean plants to her garden
decrease the amount of fertilizers she uses
harvest the vegetable plants continuously
reduce the number of decomposers that live in the soil
Nitrogen is a crucially important component for all life. It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.
Answer:
Its B
Explanation:
It converts nitrogen into a form that humans can obtain by eating other organisms.
Suppose you walk toward the rear of a moving train. Describe your motion as seen from a reference point on the train. Then describe it from a reference point on the ground.
From the train's frame of reference, you are moving toward the rear at your walking speed in the opposite direction of the train's forward motion. From the ground's frame of reference, you are still moving forward relative to the ground but at a slower rate than the train, considering both train speed and walking speed.
Explanation:When you walk toward the rear of a moving train, your motion can be described from two different frames of reference: one on the train and one on the ground. From a reference point on the train, you are simply moving toward the rear with a certain speed relative to the train. This could be described as you moving in the opposite direction of the train's forward motion, at your walking speed. If the train is moving forward at 10 m/s and you walk toward the rear at 2 m/s, from the train's frame of reference, your velocity would be -2 m/s. Now, let's switch to a reference point on the ground. From this frame of reference, your motion is more complex because you must consider both the speed of the train and your walking speed. If the train is moving forward at 10 m/s and you are walking toward the rear at 2 m/s, your speed relative to the ground would be 10 m/s - 2 m/s, which is 8 m/s in the direction the train is moving. Essentially, you are still moving forward relative to the ground but at a slower rate than the train. It's important to note that there isn't a single, correct reference frame to describe your motion; both descriptions are valid within their respective frames. Motion does not happen in isolation, and how it is perceived depends on the reference frame of the observer.
Jacobium is a radioactive metal with half life of 20 years. It contains 128 radioactive atoms. How many years will it take to decay to 2 radioactive atoms
N₀ = number of radioactive atoms initially present = 128
N = number of radioactive atoms left after time "t" = 2
t = time taken
T = half life period for the radioactive metal = 20 years
λ = decay constant = ?
decay constant is given as
λ = 0.693/T
inserting the values
λ = 0.693/20
λ = 0.0347
number of radioactive atoms left after time "t" is given as
N = N₀ [tex]e^{-\lambda t}[/tex]
inserting the values
2 = (128) [tex]e^{-(0.0347) t}[/tex]
t = 120 years
If a wave were nine feet high, how much would the amplitude be?
A. 3 feet
B. 4.5 feet
C. 12 feet
D. 18 feet
'D. 18 feet' sounds right
B. 4.5 feet is the correct answer
Most of the world’s energy supply comes from burning fossil fuels. Fossil fuels are nonrenewable resources. If people continue to burn fossil fuels at the same rate, which of the following events will most likely happen? A. All of the world’s fossil fuel reserves will be used up. B. Fossil fuels will quickly reform underneath the ocean’s floor. C. No changes will be made to the world’s fossil fuel reserves. D. Fossil fuel deposits will be found on the moon.
The answer is; A
Fossil fuels are nonrenewable energy sources. This is because the rate at which they can be used by humans will definitely be higher than the rate at which they are replenished. Fossils fuels are formed over millions of years by sedimented planktons being subjected to enormous pressure and temperatures over long periods of time. Humans consume the fossil are quite fast rates that the source of energy can be depleted in some few hundred years.
Answer:A
Explanation:
Water is observed spilling to the floor in a spaceship. Describe the motion and location of the spaceship. Use the behavior of the water to justify your answer.
The spaceship is either not moving and is in its launch pad here on earth and the water is behaving as it would anywhere else on our planet
or
the spaceship is in outer space somewhere and it has fired up its thrusters and it has created it's own gravitational Force because it is accelerating
or
the spaceship is trying to land on another planet and is slowly coming to the surface of the planet
or
the spaceship is taking off from a planet and the gravitation force of the planet is still in effect.
Answer:
Based on the principle of equivalence, the motion and location of the spaceship are unknown.
The ship may be accelerating in space, where the floor rises up to the water.
The spaceship may be stationary on Earth, where gravity causes the water to fall to the floor.
Explanation:
Using Hooke's law F spring = k dela x, find elastic constant of a spring that stretches 2cm when a 4 newton force is applied to it
Answers in the picture
Answer: 2 N/cm (B)
Given that:
Spring stretches = 2 cm ,
Force = 4 N,
determine
the spring constant/elastic constant ( k)= ?
We know that from hook's law, F = k.x N
4 = k × 2
=> k =4/2
= 2 N/cm
The elastic constant is 2 N/cm
3 question ple answer
p=F/S=>S=F/p=5*10³/12=416.66 m²
Please help!?!?
in the diagram, if a light bulb is placed at D&b is closed (as shown), what will happen?
a. The light bulb will be off
b. The light bulb will be shorted
C. The light bulb will be dimmer than normal
D. The light bulb will be on
Since bulb is connected in the closed circuit at the position of D
as well as switch B is also closed in that position so the current will flow through the bulb and bulb will glow in that position
So the most appropriate correct option will be
D. The light bulb will be on
Answer:
D. The light bulb will be on
Explanation:
When a bulb is placed at D it works like a load and will draw the current. The circuit will remain open until the switch B is closed. Once B is closed, the current will start flowing through the bulb and it will turn on.
It can be understood through an experiment as will. You can connect a small LED with a battery and see for yourself that the LED turns on.
According to the continental drift theory, what separated the continents?
A. An asteroid
B. Centrifugal force
C. Numerous volcanoes
D. The formation of oceans
Just finished this it is B. Centrifugal force
Answer:
B
Explanation:
The ms = 0.5645 and mk=0.1113 for a 30 N box on level ground. What level force is needed to start the box moving
Answer:
16.935 N
Explanation:
In order to make the box start moving, the level force applied on the box (F) must be greater than the force of static friction that keeps the box at rest, which is equal to
[tex]F_f = \mu_s (mg)[/tex]
where
[tex]\mu_s = 0.5645[/tex] is the coefficient of static friction
(mg) = 30 N is the weight of the box
Therefore, the condition for F must be:
[tex]F \geq F_f\\F \geq \mu_k (mg)=(0.5645)(30 N)=16.935 N[/tex]
So, the applied force must be greater than this value.
a man applies a force of 100n to a rock for 60 seconds but the rock does not move what is the amount of work done by the man on the rock
0 (zero) work done.
This is because work can be calculated by:
Work = Force × Distance
The force is 100 N and since the rock didn't move the distance is zero and so:
Work = 100 × 0 = 0 J
The amount of work done by the man on the rock will be
0 joules.
What is work in physics?In physics, work is defined as the product of force and the displacement caused by it. Mathematically -
W = FdcosФ
Ф is the angle between 'F' and 'd' vector.
Given is a man who applies a force of 100 N to a rock for 60 seconds but the rock does not move.
Since, the rock did not move, the displacement of the rock will be zero i.e. d = 0. Therefore, the work don will be -
W = F x 0 x cosФ = 0
Therefore, the amount of work done by the man on the rock will be
0 joules.
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which of the following is the reason that a fixed pulley makes work easier?
Answer
A fixed pulley is one of many simple machines that can make work easier. In the fixed pulley system, we pull down on one side of the rope and the other side goes up. Here the pulley can change the direction of force on a rope or belt that moves along its circumference.we use the same amount of force to pull down as we lift the toy ourselves.how does a plant react to light
Can anyone solve this numerical
Answer is 2ohms
Answer:
4 Ohms
Explanation:
The challenging part in this circuit is the bridged setup (diamond-shaped arrangement made of the 4 Ohm resistors). In general, this would first need to be transformed using the Wye-Delta transform to be solved, but in this case we can make a valid simplification: since the diamond arrangement is completely symmetrical, the voltage at the top and the bottom tip of the "diamond" will be identical and no current flows through the 4 Ohm bridge, hence, this resistor can be removed without changing the resulting resistance. After this, it is easy to see that the equivalent resistance of the modified "diamond" is just 4 Ohms.
The remaining top parallel branch of the circuit will be 8 Ohms, and the bottom parallel branch is nominally 8 Ohms. The resulting resistance therefore is 4 Ohms.
(The answer is not 2 Ohms!)
Assuming an engine operates as a reversible heat engine calculate the outlet temperature (temperature of rejected heat) that achieves a thermal efficiency of 63% if the engine takes in heat at 640°C .
Answer:
[tex]64.8^{\circ}C[/tex]
Explanation:
The efficiency of a reversible heat engine is given by:
[tex]\eta = 1 -\frac{T_C}{T_H}[/tex]
where
Tc is the cold temperature (outlet temperature)
Th is the hot temperature (temperature of the source)
In this problem, we know:
[tex]\eta = 63\% = 0.63[/tex]
[tex]T_H = 640^{\circ}C=913 K[/tex]
So, we can calculate the outlet temperature by re-arranging the formula:
[tex]T_C = T_H ( 1 -\eta)=(913 K)(1- 0.63)=337.8 K=64.8^{\circ}C[/tex]
What is magma? a. The molten mixture of rock-forming substances, gases, and water from the mantle.. c. Hardened lava on the surface of the Earth. b. Liquid rock that reaches the surface. d. All of the above Please select the best answer from the choices provided
The answer is option d... All of the above..
Calculate the potential energy of a 6kg bowling ball suspended 3m above the surface of the earth
Answer: 176.4 Joules
Explanation: Potential energy of a body is defined as the energy possessed by virtue of position.
Potential energy [tex]=m\times g\times h[/tex]
m = mass of the body = 6 kg
g = acceleration due to gravity = [tex]9.8 ms^{-2}[/tex]
h = height of body = 3 m
Potential energy [tex]=6 kg\times 9.8ms^{-2}\times 3m=176.4kgm^2s^{-2}[/tex]
= 176.4Joules {[tex]1kgm^2s^{-2}=1Joule[/tex]}
Which living thing would you expect to find in a swamp?
A. Cypress Tree
B. Sea Star
C. Cactus
D. Octopus
My answer choice would be A. Cypress Tree
Answer: A :)
Explanation:
Ap*x
Gauges all very according the vehicle , model make and year and other factors. By turning the vehicle to the ___ position you can check to see if the gauge lights work
Answer:
By turning the vehicle "ON" position you can check to see if the gauges light works.
When we switch ON or turn a key to ON the engine, we can find all the gauges working or not.
At what point is the car the fastest
C, t=3.4s. The velocity of the car increases as you go up the y axis
3.4 is the max value of speed from curve and v axis
An open organ pipe 30 cm long and a closed organ pipe 23 cm long, both of same diameter , are each sounding its first overtone , and these are in unison. What is the end correction of these pipes?
First overtone of open organ pipe is given as
[tex]f_{1o} = \frac{v}{L_1 + 2e}[/tex]
first overtone of closed organ pipe is given as
[tex]f_{1c} = \frac{3v}{4(L_2 + e)}[/tex]
now they are in unison so we will have
[tex]\frac{v}{L_1 + 2e} = \frac{3v}{4(L_2 + e)}[/tex]
[tex]\frac{1}{30 + 2e} = \frac{3}{4(23 + e)}[/tex]
[tex]90 + 6e = 92 + 4e [/tex]
[tex]e = 1 cm[/tex]
so end correction of both pipes is e = 1 cm
What type of friction prevents a pile of rocks from falling apart?
A) Cohesive Friction
B) Static Friction
C) Rolling Friction
D) Kinetic Friction
Answer:
static friction
Explanation:
static prevents objects from moving
A fighter jet accelerates from 10 m/s to 75 m/s in 7.0 s. The acceleration of the jet is
The acceleration of the fighter jet is calculated by taking the change in velocity (75 m/s - 10 m/s) divided by the time (7.0 s), which equals 9.29 m/s².
Explanation:The acceleration of a fighter jet can be calculated using the formula a = Δv/Δt, where a is acceleration, Δv is the change in velocity, and Δt is the change in time. The jet accelerates from an initial velocity (vi) of 10 m/s to a final velocity (vf) of 75 m/s in a time interval (Δt) of 7.0 s. Therefore, the acceleration can be calculated as follows:
a = (vf - vi) / Δt = (75 m/s - 10 m/s) / 7.0 s = 65 m/s / 7.0 s = 9.29 m/s2
So, the acceleration of the jet is 9.29 m/s2.
From Newton’s second law, F = ma, in which type of collision is the force of impact less?
Please provide a short paragraph explaining this.
The force of impact would be less in an elastic collision according to Newton's second law, F = ma. This is because elastic collisions spread out the time of impact, reducing acceleration and thus force. In contrast, inelastic collisions have a higher impact force, as kinetic energy is not conserved resulting in a sudden stop and a larger force.
Explanation:From Newton's second law, F = ma, we know that force (F) is the product of mass (m) and acceleration (a). In a collision, the force of impact would be less when the acceleration (or deceleration) is less. This often occurs in a collision type known as an elastic collision. In an elastic collision, both momentum and kinetic energy are conserved, meaning the objects 'bounce' off each other rather than sticking together. This spreads out the time of impact, thereby reducing the acceleration and thus the force of impact. On the contrary, in an inelastic collision, which results in a higher impact force, the objects stick together and kinetic energy is not conserved, leading to a sudden stop and thus a larger force.
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what is portable water?
It's POTABLE water, not 'portable'.
It's water that's safe to drink and tastes OK.