Answer:
D. The total amount of energy at the bottom is equal to the amount at the top, but he gained some energy as he traveled due to a higher speed.
Explanation:
The total amount of energy at the bottom is equal to the amount at the top, but some energy was converted into other forms due to friction.
Therefore the correct answer is option B.
What is mechanical energy?The sum of all the energy in motion (total kinetic energy) and all the energy that is stored in the system (total potential energy) is known as mechanical energy.
The expression for total mechanical energy can be given as follows
ME= PE + KE
As given in the problem Jacob is riding his bike down a tall hill. At the top of the hill, he has 2800J of potential energy. At the bottom of the hill, when he is going the fastest, his kinetic energy measures 2650J.
However, some energy was changed into other forms owing to friction, so the total quantity of energy at the bottom is equal to the whole amount at the top.
Thus, option B is the appropriate response,
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Please for the love of humanity please answer this question and my other question...
Answer:
It's "C"
Explanation:
Friction slows things down.
"Friction always slows a moving object down. The amount of friction depends on the materials from which the two surfaces are made. The rougher the surface, the more friction is produced. Friction also produces heat. "
Can y’all please help
Answer:
The cat's speed when it slid off the table was 2.53 m/s
Explanation:
Horizontal Motion
When an object is thrown horizontally at a speed v, from a height h, it describes a curved path ruled by gravity, until it hits the ground.
the range or maximum horizontal distance traveled by the object can be calculated as follows:
[tex]\displaystyle d=v\cdot\sqrt{\frac {2h}{g}}[/tex]
The situation described in the problem fits into the concept of a horizontal launch when the cat slides off the table and gets to the ground some distance ahead.
It's given the range as d=1.3m and the height h=1.3 m, thus we can find the cat's speed by solving the equation for v:
[tex]\displaystyle v=d\cdot\sqrt{\frac {g}{2h}}[/tex]
Where [tex]g=9.81\ m/s^2[/tex]
Substituting values:
[tex]\displaystyle v=1.3\cdot\sqrt{\frac {9.81}{2\cdot 1.3}}[/tex]
[tex]\displaystyle v=1.3\cdot\sqrt{\frac {9.81}{2.6}}[/tex]
Calculating:
v = 2.53 m/s
The cat's speed when it slid off the table was 2.53 m/s
A boy throws a steel ball straight up. Consider the motion of the ball only after it has left the boy's hand but before it touches the ground, and assume that forces exerted by the air are negligible. For these conditions, the force(s) acting on the ball is (are):
a) a downward force of gravity along with a steadily decreasing upward force.
b) a steadily decreasing upward force from the moment it leaves the boy's hand until it reaches its highest point; on the way down there is a steadily increasing downward force of gravity as the object gets closer to the earth.
c) an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity.
d) an almost constant downward force of gravity only.
e) none of the above. The ball falls back to the ground because of its natural tendency to rest on the surface of the earth.
Answer:
c) an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity.
Explanation:
When the boy throws the ball upward, there are two forces acting on the ball. First one is the force of gravity, which is constant and equal tot he weight of the ball, acting down. The second force is the force with which the boy throws the ball. This force acts upward and decreases as the ball moves up. This force becomes zero when the ball reaches highest point.
While, on its way down the ball has only one force acting on it. That force is the constant force of gravity acting downward. This gravity force is equal to the weight of the ball.
Hence, the correct option is:
c) an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity.
The force acting on the ball is an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity. Thus the option C is the correct option.
Given,
Force exerted by the air is negligible.
Now the forces acting on the ball after the realese,
Gravity- This force acts on the body and will remain constant until the ball is in the air. This force is equal to the weight ([tex]W[/tex]) which is equal to the product of the mass [tex]m[/tex] and the gravitational force [tex]g[/tex] of the earth.
[tex]W=mg[/tex]
Force applied by the boy- This is the force by which the boy through the ball. This will act upward and keep on decreasing as the ball moves upward. This force becomes zero when the body reaches the highest point.Now after reaching the highest point, the ball starts to come down. In this case, only one force will act on it which is the gravity force and this is equal to the weight of the body.
Hence, the force acting on the ball is an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity. Thus the option C is the correct option.
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Which of the following accurately describes circuits? Question 6 options: A) In a parallel circuit, the same amount of current flows through each part of the circuit. B) In a series circuit, the amount of current passing through each part of the circuit may vary. C) In a series circuit, the current can flow through only one path from start to finish. D) In a parallel circuit, there's only one path for the current to travel.
Answer:
Explanation: C is the correct one
because A) the current divides into parts for each branch
B)the current doesn't varry in series
D) in parallel the current divides and passes in all branches
a bus is moving with the velociity of 36 km/hr . after seeing a boy at 20 m ahead on the road, the driver applies the brake and the bus gets stopped at 10 m distance. Now, calculate acceleration as well as time taken by this bus to stop.
Answer:
Assumption: the acceleration of this bus is constant while the brake was applied.
Acceleration of this bus: approximately [tex]\left(-6.0\; \rm m \cdot s^{-2}\right)[/tex].
It took the bus approximately [tex]1.7\;\rm s[/tex] to come to a stop.
Explanation:
Quantities:
Displacement of the bus: [tex]x = 10\; \rm m[/tex].Initial velocity of the bus: [tex]\displaystyle u = 36\; \rm km \cdot hr^{-1} = 36\; \rm km \cdot hr^{-1}\times \frac{1\; \rm m \cdot s^{-1}}{3.6\; \rm km\cdot hr^{-1}} = 10\; \rm m \cdot s^{-1}[/tex].Final velocity of the bus: [tex]v = 0\; \rm m\cdot s^{-1}[/tex] because the bus has come to a stop.Acceleration, [tex]a[/tex]: unknown, but assumed to be a constant.Time taken, [tex]t[/tex]: unknown.Consider the following SUVAT equation:
[tex]\displaystyle x = \frac{1}{2}\, \left(a\, t^2\right) + u\, t[/tex].
On the other hand, assume that the acceleration of this bus is indeed constant. Given the initial and final velocity, the time it took for the bus to stop would be inversely proportional to the acceleration of this bus. That is:
[tex]\displaystyle t = \frac{v - u}{a}[/tex].
Therefore, replace the quantity [tex]t[/tex] with the expression [tex]\displaystyle \left(\frac{v - u}{a}\right)[/tex] in that SUVAT equation:
[tex]\displaystyle x = \frac{1}{2}\, \left(a\, \left(\frac{v -u}{a}\right)^2\right) + u\, \left(\frac{v - u}{a}\right)[/tex].
Simplify this equation:
[tex]\begin{aligned}x &= \frac{1}{2}\, \left(a\, {\left(\frac{v -u}{a}\right)}^2\right) + u\, \left(\frac{v - u}{a}\right) \\ &= \frac{1}{2}\left(\frac{{(v - u)}^2}{a}\right) + \frac{u\, (v - u)}{a} =\frac{1}{a}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right)\end{aligned}[/tex].
Therefore, [tex]\displaystyle a= \frac{1}{x}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right)[/tex].
In this question, the value of [tex]x[/tex], [tex]u[/tex], and [tex]v[/tex] are already known:
[tex]x = 10\; \rm m[/tex].[tex]\displaystyle u =10\; \rm m \cdot s^{-1}[/tex].[tex]v = 0\; \rm m\cdot s^{-1}[/tex].Substitute these quantities into this equation to find the value of [tex]a[/tex]:
[tex]\begin{aligned} a &= \frac{1}{x}\, \left(\frac{{(v - u)}^2}{2} + u\, (v - u)\right) \\ &= \frac{1}{10\; \rm m}\times \left(\frac{{\left(0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}\right)}^2}{2} + \left(0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}\right)\times 10\; \rm m \cdot s^{-1}\right)\\ &\approx -6.0\; \rm m \cdot s^{-2}\end{aligned}[/tex].
(The value of acceleration [tex]a[/tex] is less than zero because the velocity of the bus was getting smaller.)
Substitute [tex]a \approx -6.0\; \rm m \cdot s^{-2}[/tex] (alongside [tex]u = 10\; \rm m \cdot s^{-1}[/tex] and [tex]v = 0\; \rm m \cdot s^{-1}[/tex]) to estimate the time required for the bus to come to a stop:
[tex]\begin{aligned}t &= \frac{v - u}{a} \\ &\approx \frac{0\; \rm m \cdot s^{-1} - 10\; \rm m \cdot s^{-1}}{-6.0\; \rm m \cdot s^{-2}} \approx 1.7\; \rm s\end{aligned}[/tex].
If someone has a curve in his or her spine, what other bones might also be affected by the way the curve shifts that person’s weight?
Answer:
Curve in spine can effect his or her other body parts too in addition to spine. The neck or head can be tilted forward, shoulder could be hunched, hip bone can be uneven, ribs can be effected leading to disorder of lung.
Explanation:
When a bug hits a windshield of a car, the force of the car on the bug equals the force of the bug on the car.
O True
O False
True. The force of the car on the bug will be equal to the force of the bug on the car.
Newton's third lawThis statement is true according to Newton's third law of motion.
According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction.
In this case, the action is the force of the car on the bug, and the reaction is the force of the bug on the car.
Therefore, the force of the car on the bug is equal in magnitude and opposite in direction to the force of the bug on the car.
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What will happen if the atom rearrange?
1. a new substance will form
2. start to boil
3. nothing will happen
choose the correct answer
Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange amd form new bonds to make the products.
A sled and a rider slide down a snow-covered hill that makes
an angle of 30° with the horizontal. The total mass of the sled
and the rider is 70 kg. Neglecting friction, their acceleration is
m/s2. Round to the nearest tenth.
Answer: 4.9 m/s
Explanation:
If the net force on an object is to the left, what will the direction of the resulting acceleration
be? What will be the direction of the velocity?
Anyone please help ???
Acceleration points in the same direction as the net force, so to the left.
The direction of velocity can't be determined from this information alone, though. If the object is at rest, it will being moving to the left. If the object is already moving to the left, it will continue doing so and speed up. If it starts off moving to the right, it will continue to move to the right but eventually slow to a stop before starting to move to the left. There are more cases to consider if you're talking about motion in more than one dimension.
HELP
which two changes to a metal wire both increases resistance? the answer is B but why ?
Answer:
option C decreasing its thickness and increasing its temperature.Explanation:
Resistance is directly proportional to length and temperature of the wire and inversely to area.if you increase the temperature the resistance will increase.(resistance is directly proportional to temperature)if you decrease its thickness (area) then the resistance will increase ( resistance is inversely proportional to area)hope it helps:)
The distance a toy car travels over time is shown in the graph.
Which table best shows the average speed of the toy car at different time intervals?
Answer:
A
Explanation:
0-2 1.0
2-4 0.5
4-6 0
The table of velocity of toy car is drawn below.
What is velocity ?
velocity is defined as rate of change of displacement of the object with respect to rate of change in time. In mathematics It is written as :
[tex]\begin{aligned}v= \frac{\Delta d}{\Delta t}=\frac{d_{2}-d{1}}{t_{2}-t_1}\end{aligned}[/tex]
considering time interval from t=0 sec to t=2 sec the distance travelled by the toy car is d=0m to d=2m. therefore, the velocity will be :
[tex]\begin{aligned}v&=\frac{d_{2}-d{1}}{t_{2}-t_1}\\&=\frac{2-0}{2-0}\\&=1 \text{\:m/s}\end{aligned}[/tex]
similarly for interval t = (2sec - 4sec ) and t = (4sec - 6sec) is also calculate and written in table below.
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For brainliest !!!!!!! Do it
Answer and Explanation:
Using a = F/m, we get:
Acceleration for Road A = 480/62 = ~7.74 m/s^2
Acceleration for Road B = 240/62 = ~3.87 m/s^2
Acceleration for Road C = 600/62 = ~9.68 m/s^2
If the net force becomes higher than 600N and the mass stays constant, the acceleration will increase proportionally to how much the force increases and the acceleration will be greater than the acceleration when the force is 600N.
I hope this helps! :)
please help me.
During a football game, one of the players on the home team kicks the football that has a
mass of 0.6 kg so that the ball accelerates toward the opposing team at
23 m/s2. If no other forces act on the ball, how much force did the kicker apply to the
football?
Answer:
[tex]Force = 13.8N[/tex]
Explanation:
Given
[tex]Mass = 0.6kg[/tex]
[tex]Acceleration = 23m/s^2[/tex]
Required
Determine the applied force
From the question, we understand that no other force acts on the ball.
i.e. the only applied force on the ball is the force applied by the striker.
So, we apply Newton's second law to solve this question.
And this implies that:
[tex]Force = Mass * Acceleration[/tex]
[tex]Force = 0.6kg * 23m/s^2[/tex]
[tex]Force = 13.8N[/tex]
Hence, the applied force by the striker on the ball is 13.8N
The ball’s _______________ potential energy is transforming into more kinetic energy as the ball’s altitude is decreasing. What does that do to the speed of the ball?
Answer:
the ball's Stored energy 2. The balls altitude slowly comes to a stop going back into potential Energy
Explanation:
Select the correct answer.
What condition should be met for the stellar parallax method to be useful?
A.
the star should be situated within the Milky Way
B.
the star should be brighter than the Sun
C.
the star should be close enough to the Sun to show a measurable parallax
D.
the star should be visible with the naked eye
Answer:
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
Explanation:
In the field of astronomy, parallax is called stellar parallax in distant stars.
The stars for which parallax measurements have been made are those that are relatively close to the sun on the galactic scale.
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
Which of the following changes to Earth's atmosphere would increase the greenhouse effect
Select all that apply.
increasing the concentration of CO2
increasing the number of N, molecules
decreasing the concentration of CH4
decreasing the amount of water vapor
Answer:Increasing the concentration of CO2
Explanation:
I might be wrong, don't try so sorry if i'm wrong!
The changes to the Earth's atmosphere would increase the greenhouse effect and it is caused by
increasing the concentration of CO2increasing the number of N, molecules.What is Green house effect?Green house effect refers to different release of greenhouse gases like co2 to the atmosphere in large quantities therefore affection the atmosphere and ozone layer leading to the release of dangerous radiations.
Therefore, The changes to the Earth's atmosphere would increase the greenhouse effect and it is caused by
increasing the concentration of CO2increasing the number of N, moleculesLearn more about greenhouse effect below.
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How much time does it take a rhino running at 40 m/s to run 250 m?
Answer:
Rhinoceroses are odd-toed ungulates native to sub-Saharan Africa and southern Asia, though all five living species have hugely contracted in range and number due to the influence of humans. Despite their titanic, tank-like bulk, rhinos can be amazingly swift: The fastest may reach at least 50 kilometers per hour (31 mph).
Explanation:
sana makatulong
Which statement correctly describes the charge of the nucleus and the charge of the electron cloud of an atom?
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of options. However, the charge of a nucleus was discovered by Ernest Rutherford. The nucleus is located in the centre of an atom and it contains protons and neutrons. The protons are positively charged while the neutrons have no charge, thus the charge of the nucleus is positive because the neutrality of the neutron does not affect the charge of the proton.
The charge of an electron was first measured by Robert Millikan. Electrons are negatively charged subatomic particles that balance out the positive charge of the protons.
I need help ill give brainlyest
Answer:
Explanation: Afdjkldjf
A small plane flew 200 mph with a 40 mph tailwind for 480 miles. The plane returned home at a speed of 200 mph with a 40 mph headwind for 480 miles. How much longer did the flight home take?
Answer:
1 hour
Explanation:
The tailwind usually adds to the speed of airplanes while the headwind normally decreases the speed of airplanes.
For the initial journey of 200 mph with a 40 mph tailwind speed for 480 miles:
Total speed = 200 + 40 = 240 mph
Also,
Speed = distance/time
time = 480/240 = 2 hours
For the return journey of 200 mph with a 40 mph headwind for 480 miles:
Total speed = 200 - 40 = 160 mph
time = 480/160 = 3 hours
The initial flight took 2 hours while the flight back home took 3 hours. Hence it took 1 hour longer to get back home
HURRY 15 POINTS
The third most populated country in the world is __________. A. China B. India C. Canada D. the United States Please select the best answer from the choices provided A B C or D. Only pick one. this is from edunity.
Answer:
D. The United States
Explanation:
PLEASE HELP: Use Newton’s second law of motion to determine the unknown values for the following objects in motion. Assume all objects are being accelerated on frictionless surfaces or through frictionless mediums. Calculate the values, and round your answer to the correct number of significant digits. If needed, use the conversion factor 1 lb = .454 kg.
Baseball data: 0.142 kg, 1._________N, 388 m/s2
Football player data: 0.426 m/s2 , 2._________kg, 28.39 N of force pushing the player over the goal line, and 1.98 N of force by defender pushing in the opposite direction
Wagon data: 77.6 lbs,128 N, 3.___________m/s2
Answer:
base ball data 55.1 N
football player 62.0 Kg
wagon data 3.64 m/s2
Explanation:
F=ma
a=f/m
m=f/a
force (N)
mass (KG)
acceleration (A)
The force exerted by Baseball is 55.01 N.
The mass of the Football player is 62.0 Kg.
The acceleration of the Wagon is 3.63 m/s².
What is force?Force is the influence that can change the state of the body of rest or motion. Force is a vector quantity and the SI unit of force is Newton. Force can change the direction and speed of the moving object.
The force can be determined by the product of the mass (m) and acceleration (a). The mathematical expression from the second law of motion for force can be written as:
F = ma
Given, the mass of the baseball is 0.142 Kg and the acceleration of the baseball is 388 m/s2.
The force exerted by the baseball, F = ma = 0.142 Kg × 388 m/s2
F = 55.096 N
F = 55.01 N
Given, the acceleration of the football player, a = 0.426 m/s2
The net force = 28.39 - 1.98 = 26.41 N
The mass of football player, m = F/a = 26.41/0.426 = 61.99 = 62.0 Kg
The force of the wagon, F = 128 N
The mass of the wagon = 77.6 Ibs = 77.6 × 0.454 Kg = 35.23 Kg
The acceleration of the wagon = 128/ 35.23 = 3.63 m/s²
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Explain why people have different skin colors?
I think it because of UV rays ultra violet ray which can make their colors different
can someone pls help me?!!!! i need it asap!! i’m very stressed
Answer:
Acceleration
Explanation:
Its speed or velocity change
Please help. to find these
Answer:
Velocity ratio & input work
Explanation:
If u input velocity u can work the ratio...;D ;D ;D xD
A sky diver jumps out of a plane and reaches terminal velocity at 91 meters per second. How far will she fall in 35 seconds?
Can I get this answer quick!
Kinetic energy of 110 j and velocity of 70 m/s what is the mass
Answer:
0.04kg
Explanation:
Explanation in pics:
The formula for kinetic energy is KE = 1/2mv². So now the question asks for the mass, not KE. So we need to rearrange the formula so that we are calculating the mass. So, the formula for mass is m=KE/(1/2v²). Now we just substitute the values into the formula. Then just follow what it shows in the pic
Mercury is the plant from the sun
Which combustion product is a deadly gas that you cannot see or smell? O sulfur dioxide O carbon monoxide O carbon dioxide O sulfur monoxide
Answer:
carbon monoxide
Explanation: