Answers
Answer:
x = 1127 [m]
Explanation:
In order to solve this problem, we must use the equations of kinematics. With the first equation, we must find the acceleration and with the second equation we must find the distance.
\(v_{f} =v_{o} -a*t\)
where:
Vf = final velocity = 9 [m/s]
Vo = initial velocity = 55 [m/s]
a = acceleration o desacceleration [m/s²]
t = time = 49 [s]
Now replacing:
9 = 55 - a*49
a*49 = 55 + 9
a = 1.306 [m/s²]
Note: The negative sign in the above equation means that the speed decreases.
Now using the second equation.
\(v_{f}^{2} =v_{o}^{2} -2*a*x\)
(9)² = (55)² - 2*(1.306)*x
2944 = 2.612*x
x = 1127 [m]
Related Questions
Forces can...
A. Change speed of motion
B. Change shape of objects
C. Change direction of motion
D. All of the above
Answers
Answer:
D
Explanation:
Forces can change speed of motion, the more force that's applied when you push a ball for example, the faster the ball will go. Force can also change the shape of objects by applying pressure to them too. The inertia from force can change direction, as when you let's say hit a tennis ball, it won't go perfectly straight. So all of the above are correct
What instrument is used to records EQ waves?
Answers
Answer:
I believe it's a Seismograph
Explanation:
MAIN
motion with the forces acting on it.
Answers
Answer:
A force that resists the relative motion or tendency to such motion of two bodies in contact. uniform motion: Motion at a constant velocity (with zero acceleration). Note that an object in motion will not change its velocity unless an unbalanced force acts upon it.
Explanation:
A force that resists the relative motion or tendency to such motion of two bodies in contact. uniform motion: Motion at a constant velocity (with zero acceleration). Note that an object in motion will not change its velocity unless an unbalanced force acts upon it.
A Physics student is thrown horizontally at a velocity of 12 m/s from the top of a cliff 68m high. How far from the base of the cliff does the student land? (2 sig figs)
Answers
ANSWER
\(45m\)EXPLANATION
To find how far the student lands, we first have to find the time of flight using the equation that governs vertical motion:
\(y-y_0=v_{0y}t+\frac{1}{2}a_yt^2\)where y0 = initial height; y = final height; voy = initial velocity in the y direction; t = time; ay = -g; g = acceleration due to gravity
From the question, we have that:
\(\begin{gathered} y=0 \\ y_0=68m \\ v_{0y}=0m/s^{} \\ t=\text{?} \\ g=9.8m/s^2 \end{gathered}\)Therefore, we have that:
\(\begin{gathered} 0-y_0=0-\frac{1}{2}gt^2 \\ \Rightarrow t^2=\frac{2y_0}{g} \\ t=\sqrt[]{\frac{2y_0}{g}} \\ t=\sqrt[]{\frac{2\cdot68}{9.8}} \\ t=3.73\text{ seconds} \end{gathered}\)Now, we can apply the equation that governs horizontal motion to find the distance from the base of the cliff:
\(x-x_0=v_{0x}t+\frac{1}{2}a_xt^2_{}_{}_{}_{}\)where x = distance from bottom of cliff; x0 = starting position; v0x = initial velocity in the x-direction; ax = acceleration in the x-direction
From the question, we have that:
\(\begin{gathered} x_0=0m \\ a_x=0m/s^2 \\ x=\text{?} \\ v_{0x}=12\text{ m/s} \end{gathered}\)Therefore, the distance of the student from the base of the cliff is:
\(\begin{gathered} x-0=v_{0x}t+0 \\ \Rightarrow x=v_{0x}t \\ x=12\cdot3.73 \\ x\approx45m \end{gathered}\)That is the answer (to 2 significant figures).
which statement best define percent error? check all that apply.
Answers
Percent error is the difference between the experimental value and theoretical value and measures the accuracy of the result found. The larger the error, lesser is the accuracy and vice versa.
Solution:
It is a mathematical way of showing accuracy
The higher the percent error, the less accurate the data set,
A thin piece of semiconducting silicon will be used to fabricate an electrical device. This layer is 0.10 cm thick and cut into a strip 0.50 cm wide by 1.50 cm long. Electrical contacts are placed at opposite ends of its length. The intrinsic carrier concentration of the silicon at room temperature (300K) is 1.0x1010/cm3 and the bandgap energy is 1.12 eV.
Required:
a. If the application of 1.0 volt to the contacts results in a current of 0.019 amps, what is the resistivity in (ohm-cm) of the material?
b. If the material's conductivity is due to doping with aluminum to a level of [Al]= 1x10^17 atoms/cm^3, what is the resulting conductivity "type" and what is the mobility of these "majority" carriers in this material (assuming that the aluminum is fully ionized - i.e. all Al atoms donated electrons).
Answers
We have that for the Question "a)what is the resistivity in (ohm-cm) of the material? b) what is the resulting conductivity "type" and what is the mobility of these "majority" carriers in this material"
Answer:
Resistivity = \(1.754 ohm-cm\)Conductivity = \(6.25*10^{25} cm^3/V-s\)
From the question we are told
This layer is 0.10 cm thick and cut into a strip 0.50 cm wide by 1.50 cm long. The intrinsic carrier concentration of the silicon at room temperature (300K) is 1.0x1010/cm3 and the bandgap energy is 1.12 eV.
A) Resistivity is given as,
\(p = \frac{RA}{l}\)
where,
\(R = \frac{V}{I}\)
Therefore,
\(p = \frac{VA}{Il}\\\\p = \frac{1*(0.1*0.5)}{0.019*1.5}\\\\p = 1.754 ohm-cm\)
B) Conductivity is given as,
\(U = \frac{\rho}{pe}\\\\U = \frac{10^{17}}{10^{10}*1.6*10^{-19}}\\\\U = 6.25*10^{25} cm^3/V-s\)
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Calculate the ratio of H+ ions to OH– ions at a pH = 8. Find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide. Then divide the H+ concentration by the OH– concentration. Record this calculated ratio in Table A of your Student Guide. Compare your approximated and calculated ratios of H+ ions to OH– ions at a pH = 8. Are they the same? Why or why not? Record your explanation in Table A. What is the concentration of H+ ions at a pH = 8? mol/L What is the concentration of OH– ions at a pH = 8? mol/L What is the ratio of H+ ions to OH– ions at a pH = 8? :1 OR 1:
Answers
At pH = 8, the ratio of H+ ions to OH- ions is 1:1, indicating a neutral solution. The concentration of H+ ions and OH- ions is approximately 1 x 10^(-8) mol/L. The calculated and approximated ratios should match.
To calculate the ratio of H+ ions to OH- ions at pH = 8, we need to use the relationship between pH and the concentration of H+ ions. The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution based on the concentration of H+ ions.
The formula to calculate the concentration of H+ ions (\(C_H\)+) from pH is:
\(C_H\)+ = \(10^(^-^p^H^)\)
Substituting pH = 8 into the formula:
\(C_H\)+ = \(10^(^-^8^))\)
Using the properties of logarithms, we can calculate the concentration of H+ ions:
\(C_H\)+ ≈ 1 x \(10^(^-^8^))\) mol/L
According to the concept of neutrality in water, the concentration of H+ ions is equal to the concentration of OH- ions. Therefore, the concentration of OH- ions (\(C_O_H\)-) is also approximately 1 x \(10^(^-^8^))\)mol/L.
To calculate the ratio of H+ ions to OH- ions, we divide the concentration of H+ ions by the concentration of OH- ions:
Ratio = \(C_H\)+ / \(C_O_H\)-
Ratio = (1 x \(10^(^-^8^))\) / (1 x \(10^(^-^8^))\))
Ratio = 1:1
The ratio of H+ ions to OH- ions at pH = 8 is 1:1, indicating a neutral solution. This means that the concentration of H+ ions is equal to the concentration of OH- ions, resulting in a balanced ratio.
When comparing the calculated ratio of 1:1 to the approximated ratio at pH = 8, they should be the same because the ratio of H+ ions to OH- ions is determined solely by the pH value, which is consistent and mathematically derived. Therefore, the approximated and calculated ratios should match.
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Which of the following would fill in the table where "A" is?
Symbol
Element Name
Atomic Number Mass Number
#nº
#p
#e
Net Charge
Si
Silicon
A (#13)
27
B (#14 14 C (#15)
0
D (#16)
Potassium
18
39
19
18 E (#17)
A. 3
B. 13
C. 14
D. 28
Answers
Answer:
.lyrjhg.
Explanation:
qqlqfgtjnfh
can someone pls help me
Answers
A restriction in the blood supply to the cardiac muscle.
A heart attack is an urgent medical situation. Heart attacks are typically brought on by blood clots that block the heart's blood flow. Without blood, tissue dehydrates and deteriorates.
A tightness or pain in the chest, neck, back, or arms, as well as weariness, dizziness, an irregular heartbeat, and anxiety, are other symptoms. Atypical symptoms are more common in women than in males.
Brain stroke
Damage to the brain caused by a blood supply disruption.
A stroke is an urgent medical matter.
Stroke symptoms include paralysis or numbness of the face, arm, or leg, as well as difficulty moving, speaking, and understanding.
Brain damage can be reduced by receiving early therapy with drugs like tPA (clot buster). The goals of other therapies include reducing side effects and stopping further strokes.
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REWRITE THIS SENTENCE ON THE LINES PROVIDED.
The time it takes for the moon to rotate once on its axis is the same amount of time it takes for
the moon to revolve around the Earth once. The result is that the SAME SIDE OF THE MOON
ALWAYS FACES THE EARTH.
Answers
The amount of time it takes for the moon to complete one full rotation around the Earth is the same as its period of one full rotation on its axis. Due to this, the EARTH ALWAYS SEE THE SAME SIDE OF THE MOON.
What does the earth's rotation entail?With an inclination of 23.45 degrees from the plane of its orbit around the sun, the Earth revolves on its axis in relation to the sun every 24.0 hours mean solar time. The differences brought on by the Earth's are averaged out to create mean solar time.
What occurs when the Earth rotates?Rotation causes the day-night cycle, which in turn induces a cycle of temperature and humidity. As the world spins, the sea level rises and falls twice each day. The tidal range is determined by the gravitational pull of the sun and moon together
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The product of an object's mass and velocity is it's
A) acceleration
B) inertia
C) momentum
D) weight
Answers
Answer:
C) Momentum
Explanation:
Refers to an objects mass in motion.
A butcher has a beam balance and masses 0.5kg and 2kg .How would he measure 1.5 kg of meat on the beam balance at once.
Answers
The butcher should balance both the meat and 0.5 kg mass on one arm of the beam balance and 2 kg mass on the other arm of the beam balance.
What is a beam balance?A beam balance can be defined as an apparatus which comprises a lever with two (2) equal arms and a bowl (pan) that is suspended from each arm, so as to measure the mass of an object.
In this scenario, the butcher should balance both the meat and 0.5 kg mass on one arm of the beam balance and 2 kg mass on the other arm of the beam balance.
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I need help with this please thank you!
Answers
D. A beam balance does not measure mass; it measures weight. The gravitational force of attraction between the earth and an object depend on the mass of the object. ... The beam balance measures the force F exerted by the mass on the beam balance
8. A car initially has 100 J of total energy. After driving down the road, the car's
A car initially has 100 J of total energy after driving down the road the cars total energy is measured to be 80 J.
a. How much work was done on the car? (Show all your work including the formula/unit)
b. Was the work done on the car positive or negative? Explain.
Answers
The work done on the car is -20 J.
Work done on the car is negative, meaning that the car actually does work on the external system.
Energy and law of conservation of energyEnergy is the ability to do workthe law of conservation of energy states that the total energy in a system is conservedFrom the law of conservation of energy, the initial energy of the car before it moves down the road remains constant or unchanged.
Initial energy = 100 JInitial energy = Final energy - work done on carFinal Energy = Work done on car + initial energy80J = Work done on car + 100 J
Work done on car = 80 - 100J
Work done on car = -20 J
Hence, the work done on the car is -20 J
Work done on car is negative.
Since work done on the car is negative, it means that the car actually does work on the external system. Hence, the decrease in the energy of the car.
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50 Point Physics Question!
What is the acceleration of object 2 and how did you determine that value?
What is the acceleration of the object 1 and how did you determine that value?
What is the tension in the string (show work)?
What is the mass of the object 1 (show work)?
Objects 1 and 2 are labelled with a 1 and 2
Answers
Answer:
dfsdfgsdfaefffsfffefefef
Explanation:
eg3g3gf3f3f3f3f3f3f3f3f3f3ggeg
Some energy waves, like light, are absorbed by some materials and reflected by others. A
mirror will reflect the light beam from a flashlight. Make a list of materials that you predict
will absorb light and reflect light. (Sample materials: a t-shirt, aluminum foil, water, smoke,
a smart phone screen.)
Answers
Answer:Materials that absorb light are called pigments. Pigments are colored substances that absorb certain wavelengths of light and reflect others. For example, a red pigment absorbs all colors of light except red, which it reflects. Materials that reflect light are called reflective materials. Reflective materials are materials that reflect light instead of absorbing it. Examples of reflective materials include aluminum foil and mirrors. Some materials, such as glass, are transparent and allow light to pass through them
What is the only difference between the reactant and product side of a chemical reaction?
Answers
Answer:
Products is the result. Reactants produce the result
Explanation:
,,
Combustion is another word for?
Answers
Combustion is another word for Burning or Igniting.
Hope it helps u! :)
what happened in my room
Answers
Answer:
A GHOST CAME! Booooo!!!!!!Hah lol
What is the centripetal acceleration of 30 kg child standing 5 meters from the center of a
rotating carousel? The carousel is rotating at a linear velocity of 20 m/s.
Answers
Answer:
80m/s2
Explanation:
m=30kg. r = 5meter v = 20m/s2 a= ? centripetal acceleration = v*v/r
20*20/5=80m/s2
centripetal acceleration=80 m/s2
Question 1 of 10
A business must decide whether to open a new office in China. If it opens the
branch, it will increase its chances of selling a high volume of its products in
China. On the other hand, the business will have to spend a lot of money to
make the branch operational.
What would be an opportunity cost for the business if it chooses not to open
the new branch in China?
A. The business would lose the chance to make more money in
China.
B. The business would increase its marginal benefits on each
product it makes.
Answers
Opportunity cost refers to the cost of the next best alternative that must be forgone in order to pursue a certain action. In this case, if the business chooses not to open the new branch in China, the opportunity cost would be the potential revenue and profits that could have been generated by selling products in China.
A block is given an initial speed of 3m/s up a 25° incline coefficient of friction= 0.12
A) how far up the plane will it go?
B) how much time elapses before it returns to it's starting point?.
Answers
Answer:
a) y = 0.459 m , b) t = 13 s
Explanation:
a) For this exercise we use Newton's second law to find the acceleration of the block
we fix a reference system with the x axis parallel to the plane and the y axis perpendicular to it
X axis
-Wₓ - fr = m a (1)
Axis y
N - \(W_{y}\) = 0
N = W_{y}
the friction force has the formula
fr = μ N
let's use trigonometry to find the components of the weight
sin 25 = Wₓ / W
Wₓ = W sin 25
cos 25 = W_{y} / W
W_{y} = W cos 25
we substitute in 1
- W sin 25 - μ W cos 25 = m a
- g (sin 25 - μ cos 25) = a
let's calculate
a = - 9.8 (sin 25 - 0.12 cos 25)
a - 0.25 m / s
this is the acceleration on the plane, so we can use the kinematic relations in one dimension
the highest point where the block rises the speed is zero (va = 0)
v² = v₀² - 2 a y
y = v₀² / 2g
y = 3 2 / (2 9.8)
y = 0.459 m
this is the distance the cantes block travels to stop
b) the time of the entire journey is
y = v₀ t - ½ a t²
the point where the body recesses is y = 0
0 = (vo - ½ a t) t
whose solutions are
t = 0
0 = vo - ½ a t
t = 2vo / a
t = 2 3 / 0.459
t = 13 s
Who? What? Where? When? Why?
Answers
20.
All financial goals are long-term goals.
True
False
Answers
Answer:
Hello todays answer should be False i am sorry if i am incorrect-Lucy
Explanation:
Answer:
True
Explanation:
Because its facts
It will impact the rest of your career
A parallel circuit has four branch currents: 120 mA, 380 mA, 250 mA, and 2.1 A. How much current is supplied by the source?
Answers
A parallel circuit is an electrical circuit with more than one current path and all circuit components are connected between the same two sets of electrically common points. The current supplied by the source in a parallel circuit is equal to the sum of all branch currents in the circuit.
The sum of the branch currents in a parallel circuit can be calculated by adding up the values of the individual branch currents. In this case, we have four branch currents: 120 mA, 380 mA, 250 mA, and 2.1 A. Thus, the sum of the branch currents is:120 mA + 380 mA + 250 mA + 2.1 A= 2.85 ATherefore, the current supplied by the source in this parallel circuit is 2.85 A. This is because, in a parallel circuit, the current from the source is split between the different branches of the circuit. Each branch will have a different current, but the sum of all the branch currents will always equal the current supplied by the sourceFor such more question on parallel circuit
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A 5.0 kg object is initially at rest at x0 = 0. A non-constant force is applied to the object which causes the object to move in the same direction as the force. The applied force as a function of position is shown on the graph below. a) How much work is done on the object during the first 12.5 m? b) What is the change in kinetic energy at the end of 12.5 m? c) What is the speed of the object at the end of 12.5 m? d) What is the total work done by the force for the entire trip? e) What is the change in kinetic energy for the entire trip? f) What is the speed of the object at the end of 20 m?
Answers
a) The work done on the object during the first 12.5 m is equal to the area under the force-position curve between x = 0 and x = 12.5 m. The area can be calculated using integration. The result is that the work done is 16.875 J.
What is force?Force is defined as an external influence or push which can cause an object to move, accelerate, rotate, or deform. Force can be physical or non-physical, such as gravity, friction, magnetism, or a push or pull. Force can also be described as a cause of change in motion or a change in shape.
b) The change in kinetic energy at the end of 12.5 m is equal to the work done, 16.875 J.
c) The speed of the object at the end of 12.5 m can be calculated using the equation KE = 1/2 mv^2. Solving for v gives a speed of 1.6 m/s.
d) The total work done by the force for the entire trip can be calculated by integrating the force-position curve between x = 0 and x = 20 m. The result is that the total work done is 24.25 J.
e) The change in kinetic energy for the entire trip is equal to the total work done, 24.25 J.
f) The speed of the object at the end of 20 m can be calculated using the equation KE = 1/2 mv^2. Solving for v gives a speed of 2.4 m/s.
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A motorcycle stoop is at a traffic light, when the light turns green, the motorcycle accelerates to a speed of 78 km/h over a distance of 50 m. What is the average acceleration of the motorcycle over this distance?
Answers
The average acceleration of the motorcycle over the given distance is approximately 9.39 m/s².
To calculate the average acceleration of the motorcycle, we can use the formula:
Average acceleration = (final velocity - initial velocity) / time
First, let's convert the final velocity from km/h to m/s since the distance is given in meters. We know that 1 km/h is equal to 0.2778 m/s.
Converting the final velocity:
Final velocity = 78 km/h * 0.2778 m/s = 21.67 m/s
Since the motorcycle starts from rest (initial velocity is zero), the formula becomes:
Average acceleration = (21.67 m/s - 0 m/s) / time
To find the time taken to reach this velocity, we need to use the formula for average speed:
Average speed = total distance/time
Rearranging the formula:
time = total distance / average speed
Plugging in the values:
time = 50 m / 21.67 m/s ≈ 2.31 seconds
Now we can calculate the average acceleration:
Average acceleration = (21.67 m/s - 0 m/s) / 2.31 s ≈ 9.39 m/s²
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HELP! How much power is indicated by each example
Answers
Power is indicated by example 1 is 5 ft-lbs/s.
Power is indicated by example 2 is 600 ft-lbs/s.
Power is the rate of doing work. Power is also defined as work divided by time. i.e. Power = Work ÷ Time. Its SI unit is Watt denoted by letter W. Watt(W) means J/s or J.s-1. Something makes work in less time, it means it has more power. Work is Force times Displacement. Dimension of Power is [M¹ L² T⁻³]. Example of the power is when you take 1 J of energy in 1 second then the power is 1 W.
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Jacob works in a store that sells jeans. Jacob is stacking a new delivery of
jeans to display on top of the old jeans so that they are touching. In Stack
1, the top pair of jeans is larger than the bottom pair. In Stack 2, both
pairs of jeans are the same size as the bottom pair in Stack 1. What does
the different amount of energy mean for the temperature of all four
pairs of jeans, and how will the top 2 pairs of jeans compare in
temperature after a while? Why?
Answers
A child playing by the side of a well is throwing a stone vertically into the well with an initial velocity of 5 m/s. if the stone falls into the water 3 s later, find the height, h, of the point which the stone is thrown from the surface of the water. (g=10 m/s2)
a) 15m
b)30m
c)45m
d)60m
Answers
The height of the well is 30m
We are given that ,
The initial velocity of the stone = u = 5m/s
The stone fall into well in time = t = 3s
The acceleration due to gravity = g = 10 m/s²
To get the height of the stone which is thrown from the surface of the water in the well by equation,
h = ut + 1/2 gt²
Where, u is initial velocity in m/s, h is height in m, t is time in secs, g is acceleration due to gravity which is vertically upward direction i.e. (-10m/s²)
h = (5m/s) (3s) + 1/2 (-10m/s²)(3s)²
h = (15m) - (5m/s²)(9s²)
h = -30 m
Therefore, the height of the stone which is thrown upward is 30 m . And here, we can neglect the negative sign due to height is never be in negative.
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