The Average speed can be found by dividing the total traveled by the amount of time it took to travel that distance.
For example, if it took you 10 hours to travel 100 miles, your average speed is the amount of miles you traveled in 1 hour. Simplify.
100/10 = 10/1
Your average speed is 10 miles per hour.
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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
Which of these circuit schematics has a DC voltage source?
Answer:
(C) (see image of it attached)
Answer: circuit C
Explanation:
A DC voltage source supplies current in single direction. It is represented by alternate small and big straight lines.
An Ac voltage source supplies alternating current i.e. the current changes direction.
In the given circuit diagrams, only circuit C has a DC voltage source.
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.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
A ball is thrown with an initial speed of 10. Meters per second. At what angle above the horizontal should the ball be thrown to reach the greatest height?
The initial speed doesn’t matter. To reach the maximum height, you need to launch straight up ... 90 degrees above horizontal.
Answer:
90 degree
Explanation:
The height for the projectile motion is given by
H = u^2 Sin^2 theta/ 2g
Height is maximum when sin theta is maximum.
Sin theta is maximum when it's value is 1.
So the value of theta is 90 degree.
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 much energy is required to turn 20 gram cube of ice at a temperature of -10 degrees Celsius into liquid water at a temperature of 10 degrees Celsius
Given that:
Mass (m) = 20 g = 0.02 Kg,
temperature (T₁) = -10°C = -10+273 = 263 K
temperature (T₂) = 10°C = 10+273 = 283 K
Specific heat of water (Cp) = 4.187 KJ/Kg k
We know that Heat transfer (Q) = m. Cp.( T₂ - T₁)
= 0.02 × 4.187 × (283-263)
Q = 1.67 KJ
Heat transferred is 1.67 KJ
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
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.
The ms = 0.5645 and mk=0.1113 for a 30 N box on level ground. What level force is needed to keep it moving at a constant velocity
Answer:
3.339 N
Explanation:
In this problem, the box is moving at constant velocity, so the box is in motion and therefore we can consider only the kinetic friction.
The resultant of the forces acting on the box must be equal to the product of mass and acceleration:
[tex]F_{net}=ma[/tex]
However, the box is moving at constant velocity, so the acceleration is zero: a=0. Therefore,
[tex]F_{net}=0[/tex] (1)
There are two forces acting on the box:
- The push: F
- The kinetic friction on the box, equal to
[tex]-\mu_k mg[/tex]
where [tex]\mu_k = 0.1113[/tex] is the coefficient of kinetic friction and (mg)=30 N is the weigth of the box, and where the negative sign means it is in the opposite direction of the motion.
Therefore, eq.(1) becomes
[tex]F-\mu mg =0\\F= \mu mg=(0.1113)(30 N)=3.339 N[/tex]
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!
what is portable water?
It's POTABLE water, not 'portable'.
It's water that's safe to drink and tastes OK.
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!)
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.
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]}
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:
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..
Explain the effect of earths gravity on objects on the surface of earth?
Answer:
Gravity pulls objects toward Earth.
The rate of acceleration due to gravity is 9.8 m/s2.
Weight on Earth’s surface is a result of gravity’s pull.
Explanation:
these are the answers for e2020
Gravity is a fundamental force that gives weight to objects and causes freefall. On Earth, it also causes the ocean tides and affects time, making it pass slower closer to Earth's surface. In our universe, it plays a vital role in the dynamics of celestial bodies.
Explanation:Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. It is mathematically described as: F = G *(m1*m2)/r^2 where F is the force of attraction between the two bodies, m1 and m2 are the two masses, r is the distance between the centers of the two masses and G is the gravitational constant.
On Earth, gravity gives weight to physical objects and causes the ocean tides. The force of Earth's gravity comes from the object's mass and the acceleration due to gravity, which is approximately 9.8 m/s^2 at sea level. When an object is in freefall, the only force acting upon it is gravity.
Gravity also affects time and space, causing time to pass more slowly closer to the surface of the Earth compared to further away. This concept is known as time dilation. In essence, gravity is a crucial force that plays a key role in the structure and lifecycle of planets and the orbital movement of celestial bodies.
Learn more about Gravity here:https://brainly.com/question/31321801
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Describe the path of blood through the heart, starting at the superior and inferior vena cava and leaving the aorta.
The superior and inferior vena cava are the two main blood vessels that bring de-oxygentated blood back to the heart after the blood's done a circuit of the body to offload its oxygen to organs and muscles and tissues and cells, etc. The blood from these vessels enters the right atrium of the heart. Once the atrium is full of blood it contracts, pushing the blood through the open tricuspid valve into the right ventricle of the heart. The tricuspid valve closes shut once the blood is in the right ventricle, preventing the blood from returning to the right atrium. While the valve is closed, the ventricle contracts, pushing the blood out of the heart through the pulmonic valve, into the pulmonary artery, where it is carried directly to the lungs where it gets a new supply of oxygen attached to it. The freshly oxygenated blood courses along the pulmonary vein from the lungs back to the heart, entering the heart's left atrium. When the left atrium is full of blood, it empties by contraction, through the open mitral valve, into the left ventricle of the heart. The mitral valve then closes, so the blood cannot retrace its path. The left ventricle then contracts, pushing the blood out of the heart through the aortic valve into the big blood vessel called the aorta, from where it courses round the body delivering oxygen again.
Answer:
superior vena cava right atrium tricuspid valve right ventricle pulmonary arteries lungs capillariespulmonary veins left atrium mitral or bicuspid valve left ventricle aortic valve aorta body.Explanation:
Two 1-kg point masses a distance d apart each exert a gravitational attraction F on the other one. If 1 kg is now added to each mass, the gravitational attraction exerted by each will be _____.
Question: Two 1-kg point masses a distance d apart each exert a gravitational attraction F on the other one. If 1 kg is now added to each mass, the gravitational attraction exerted by each will be
Answer: 4f
Explanation: a gravitational force is propotional to a square of distance between two point masses so we separate the masses to a distance
question answered by
(jacemorris04)
We know that the gravitational force is proportional to (m₁) · (m₂).
Now we want to know the force between (2·m₁) · (2·m₂).
Well, that's just the same as (2·2) · (m₁)·(m₂), which is 4 · (m₁)·(m₂) ... four times the original force.
So in this question, the new pair of gravitational forces will be 4·F in each direction.
Why does a large container of boiling water contain more heat than a kilogram of lead at 300°c7? O because lead Is heavier than water and will not absorb as much heat O because water will vaporize faster and change to steam, therefore absorbing more heat than the lead O because the specific gravity of lead is much greater than that of water, keeping it from absorbing as o because water's specific heat is much greater than that of lead, therefore this amount of lead cannot contain as much heat
It is because of the differences in specific heats. The specific heat of water is much higher than that of lead. It takes more heat to raise water to a boiling point and keep it there than it takes lead to maintain a temperature of of 300oC.
It's all due to specific heat. The answer, though poorly worded, is the last choice.
Answer:
because water's specific heat is much greater than that of lead, therefore this amount of lead cannot contain as much heat.
A 1.5kg ball is thrown at 10 m/s what is the balls momentum
the ball's momentum is 10 × 1.5 = 15 kg m/s
Answer : The momentum of ball is, 15 kg.m/s
Explanation :
Momentum : It is defined as the motion of a moving body. Or it is defined as the product of mass of velocity of an object.
Formula of momentum is:
[tex]p=mv[/tex]
where,
p = momentum = ?
m = mass = 1.5 kg
v = velocity = 10 m/s
Now put all the given values in the above formula, we get:
[tex]p=(1.5kg)\times (10m/s)[/tex]
[tex]p=15kg.m/s[/tex]
Therefore, the momentum of ball is 15 kg.m/s
If I decrease the wavelength of an electromagnetic wave what will happen to the frequency of the wave?
This can be viewed as a decrease in the wavelength of the wave. A decrease in wavelength at a constant speed is associated with an increase in frequency since waves follow the equation v=f*λ, where λ is the wavelength and f is the frequency.
how does a plant react to light
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
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
Which electromagnetic waves have the longest wavelengths?
A.radio waves
B.X-rays
C.gamma rays
D.visible light
i need the answer ASAP!!!
The answer is Radio Waves
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.
To solve more questions on Work done, visit the link below-
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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
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