The image shows a pendulum that is released from rest at point A. Shari tells her friend that no energy transformation occurs as the pendulum swings between point B and point D.
What is the best response that Shari’s friend could make?
She could agree with Shari because the pendulum is at the same height and would have the same gravitational potential energy at both positions.
She could agree with Shari because the pendulum has the same amount of mechanical energy throughout its swing.
She could disagree with Shari because the pendulum converts kinetic energy into gravitational potential energy, then back into kinetic energy.
She could disagree with Shari because the pendulum converts gravitational potential energy into kinetic energy, then back into gravitational potential energy.
Answers
Answer:
She could disagree with Shari because the pendulum converts gravitational potential energy into kinetic energy, then back into gravitational potential energy.
Explanation:
The energy of the pendulum is constantly converted from gravitational potential to kinetic, and back.
In fact:
- the gravitational potential energy of the pendulum is given by:
[tex]U=mgh[/tex]
where m is the mass of the pendulum, g is the gravitational acceleration, and h is the height of the pendulum above the ground
- The kinetic energy of the pendulum is given by:
[tex]K=\frac{1}{2}mv^2[/tex]
where v is the speed of the pendulum.
Therefore, when it is at a higher position, the pendulum has a greater potential energy, while when it is at a lower position, the pendulum has a greater kinetic energy (because its speed is higher).
In this example:
- when the pendulum swings from B to C, part of its gravitational potential energy is converted into kinetic energy (because the height decreases but the speed increases), and when the pendulum goes from C to D, the kinetic energy is converted back into gravitational potential energy (because the height increases and the speed decreases)
Related Questions
A small 21 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?
answer =
units =
Answers
Kinetic Energy= 0.5*m*v^2
m= mass
v= speed
KE= 0.5*21*4^2
KE= 168
You use joules as the units.
So, 168 joules.
I hope this helps!
~kaikers
As per this question the mass of canoe is given as 21 kg.
The canoe is floating downriver with a speed of 4 m/s.
We are asked to calculate the kinetic energy of the canoe.
The kinetic energy is the energy due to the motion of the body.
If a body has mass m and it moves with a velocity v ,then its kinetic energy is defined as
[tex]kinetic\ energy [K.E]=\frac{1}{2} mv^{2}[/tex]
we are given v= 4 m/s and m= 21 kg
Hence kinetic energy of canoe [tex]K.E= \frac{1}{2} *21 kg [4 m/s]^{2}[/tex]
=168 Joule.
Hence the kinetic energy of the particle is 168 Joule.
Here Joule is the unit of energy
Imagine that you have a 6.50 l gas tank and a 4.50 l gas tank. you need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. if you fill the larger tank with oxygen to a pressure of 155 atm , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? assume ideal behavior for all gases. express your answer with the appropriate units.
Answers
Given the scenario and assuming ideal gas behavior, to ensure both gases run out at the same time, you should fill the acetylene tank to a pressure of approximately 224 atm.
Explanation:For gases behaving ideally, the pressure, volume, and temperature are related by the Ideal Gas Law (PV = nRT). However, in this problem, we assume temperature and gas constant are the same for both gases. Hence, the amount of gas (in moles) is directly proportional to the product of pressure and volume (PV).
Now you want to calculate the pressure in the acetylene tank that ensures both gases run out at the same time. Since both gas tanks will be opened for the same timeframe, the amounts of each gas in moles used will be the same. Hence, the products of pressure and volume will also be equal for both tanks (PV of oxygen tank = PV of acetylene tank).
In other words, (Pressure of oxygen) x (Volume of oxygen) = (Pressure of acetylene) x (Volume of acetylene). By inserting given values for oxygen (Pressure = 155 atm, Volume = 6.50 L) and the volume of acetylene (4.50 L), you can solve for the pressure in the acetylene tank.
From this equation, Pressure of acetylene = (Pressure of oxygen) x (Volume of oxygen) / (Volume of acetylene) = 155 atm x 6.50 L / 4.50 L = 223.88 atm.
Therefore, to ensure you run out of both gases at the same time, you should fill the acetylene tank to a pressure of approximately 224 atm.
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In a shuffleboard game, the puck slides a total of 12 m before coming to rest. if the coefficient of kinetic friction between the puck and the horizontal board is 0.34, what was the initial speed of the puck?
Answers
[tex]F_f = mg \mu_D[/tex]
where m is the mass of the puck, [tex]g=9.81 m/s^2[/tex] and [tex]\mu_D=0.34 [/tex] is the dynamic coefficient of friction.
The work done by this force to stop the puck is
[tex]W=F_f d [/tex]
where [tex]d=12 m[/tex] is the total displacement of the puck.
The initial kinetic energy of the puck is
[tex]K= \frac{1}{2} mv^2 [/tex]
with v being the puck initial velocity. The puck comes to rest after 12 m, this means it loses all its kinetic energy, and for the principle of conservation of energy this loss of energy is equal to the work done by the frictional force. So we can write
[tex]K=W[/tex]
[tex] \frac{1}{2} mv^2 = mg\mu_D d [/tex]
and from this we can find the inizial velocity of the puck:
[tex]v= \sqrt{2 g \mu_D d}= \sqrt{2(9.81 m/s^2)(0.34)(12 m)}=8.95 m/s [/tex]
From a young age, we observe and learn and we incorporate into our own lifestyle the behaviors of people around us.
True
False
Answers
This statement is true.
From a young age, we observe and learn and we incorporate into our own lifestyle the behaviors of people around us.
This is because at a young age, people do learn from what's around them.
Hope this helps you.
Have a great day!
The usual motion of the planets against the background of stars is_________ to _____ motion.
Answers
Among the largest passenger ships currently in use, the Norway has been in service the longest. The Norway is more than 300 m long, has a mass of 6.9x10^7 kg, and can reach a top cruising speed of 9 m/s. Calculate the magnitude of the ships momentum
Answers
[tex]p=mv[/tex]
where m is the mass of the object, and v is its velocity.
In our problem, the mass of the ship is [tex]m=6.9 \cdot 10^7 kg[/tex] while its velocity is [tex]v=9 m/s[/tex], so the momentum of the ship is
[tex]p=mv=(6.9 \cdot 10^7 kg)(9 m/s)=6.21 \cdot 10^8 kg m/s[/tex]
Answer:
6.9x10^7
Explanation:
A rocket is launched straight upward with a velocity of 90 m/s. It slows down, reverses direction, and returns to earth. what is the rockets velocity at its highest point above the ground.
a. 0.078 m/s
b. 0 m/s
c. -7.0 m/s
d. 13 m/s
e. -13 m/s
Answers
Answer: 0 m/s
The rocket is launched straight upward with a velocity of 90 m/s, At the highest point, the instantaneous velocity would be 0 m/s. The rocket slows down while moving up. The velocity would be 0 m/s at the highest point for an instant and then reverses direction to return on Earth. If it is not controlled, then it would free fall under gravity.
THIS IS SIMPLE BUT I WANT A FOR SURE ANSWER :)
The ocean floor is at a lower elevation than the continents. Which of the following pieces of evidence best supports this claim?
A.Tectonic plates located below the continental crust do not move
B.Gravitational force is stronger beneath the continental crust.
C.Oceanic crust is thinner and denser than continental crust.
D.Continental crust and oceanic crust are stacked in alternating layers.
Answers
I Hope This Helps
Answer:
C. Oceanic plate is thinner and denser than continental plate.
Explanation:
Oceanic plate is also called SIMA because it is made up of silicon and magnesium whereas continental plate is called SIAL because it is made up of silicon and aluminium. Oceanic plate and continental plate both are less dense that mantle but oceanic plate is denser than continental plate. Oceanic plate is made up of basaltic rocks and continental plate is made up of granitic rocks.
Ramon is playing soccer. The ball comes straight at him, and he kicks it to a player on his right. His kick is an example of
Answers
Hope you find this helpful! :)
Answer: d is the answer please give me vote and thanks
Explanation:
Jed drops a 18 kg box off of the Eiffel tower. After 6.1 seconds, how fast is the box moving (neglect air resistance.)
A. 1100 m/s
B. 78 m/s
C. 180 m/s
D. 3.3 m/s
E. 60 m/s
Answers
velocity/ 6.1 = 180
velocity = 1098 m/s
the answer is A.
Answer:
Speed, v = 60 m/s
Explanation:
Given that,
Mass of the box, m = 18 kg
Time, t = 6.1 seconds
Initially the box is at rest, u = 0
Let v is the final speed of the box i.e. after 6.1 seconds. We can calculate it using first equation of motion as :
[tex]v=u+at[/tex]
Here, a = g
[tex]v=gt[/tex]
[tex]v=9.8\times 6.1[/tex]
v = 59.78 m/s
or
v = 60 m/s
So, after 6.1 seconds, the box is moving with a speed of 60 m/s. Hence, this is the required solution.
What causes the mechanical advantage of the inclined plane to be less than that of the lever? 30 points !!!
Answers
Levers often have a greater mechanical advantage than inclined planes because they can amplify force more efficiently over shorter distances. Inclined planes reduce the force needed by increasing the distance, but the work done remains the same; friction can additionally reduce the inclined plane's efficiency.
When comparing the mechanical advantage (MA) of simple machines such as the lever and the inclined plane, the reason that the lever often has a greater efficiency than the inclined plane has to do with the amount of work done and the distance over which the force is applied.
An inclined plane increases the distance over which the force must be applied to move an object to the same height, thus reducing the input force needed. However, because that distance is increased, the force must be applied over a longer path, which may result in similar amounts of work being done as lifting the object straight up. The MA of an inclined plane can be calculated using the formula MA=1/sin θ.
The lever, on the other hand, operates based on the distances from the fulcrum to the points of application of the effort and load forces. The ratio of these distances determines the MA. With levers, it is possible to gain a significant MA even over a short distance, allowing more efficient force amplification, usually without the same extent of motion required by an inclined plane.
Furthermore, when comparing the two machines, friction may play a minor role. As the inclined plane involves a greater travel distance, the opportunity for friction to affect the work done is increased, potentially reducing the system's efficiency compared to a lever where the interaction points may be more limited and thus less susceptible to energy loss due to friction.
Objects in space __________. question 12 options: require energy to move because they have mass do not require energy to move because there is no gravity stop on their own move on their own
Answers
they do not require energy to move because there is no gravity.
hope it helps.
Help ASAP!
Question: Any object with mass has gravity.
Answer: Never true, sometimes true, OR always true
Answers
A jet fighter flying at 300 m/s (just below the speed of sound) makes a turn of radius 1.85 km. (a) what is its centripetal acceleration in gs?
Answers
a = v² / r
a= centripetal acceleration
v = velocity
r = radius
substituting the values in the equation,
a = (300 m/s)*(300m/s) / (1.85 *1000) m
= 48.64 ms-²
a ferris wheel takes 5 minutes to complete one full rotation, what is the angular velocity of the ferris wheel
Answers
now, a full rotation, or namely a revolution, is 2π radians, and the ferris wheel does it in 5 minutes, thus ω = 2π/5 which is about 1.256637061435917 rads/minute
Answer:
0.021 rad/s
Explanation:
t = 5 minutes = 5 x 60 = 300 seconds
Time taken to complete one complete round is called time period.
Let the angular velocity is ω.
The relation between angular velocity and the time period is given by
ω = 2 π / T
ω = ( 2 x 3.14 ) / 300 = 0.021 rad/s
Salt dissolves more quickly in water when the water molecules are moving very quickly. In which of these water samples would salt dissolve most slowly? water at 15°C water at 50°C water at 75°C water at 98°C
Answers
The real answer is:
water at 15°C
Answer:
The answer is Water at 15°C
Explanation:
A blu-ray disc rotates counterclockwise and speeds up at a constant rate. how does the tangential acceleration of point p compare to the tangential acceleration of point q?
Answers
However, we can solve it this way. First of all, every point of the disk has the same angular acceleration, which is the rate of variation of the angular velocity in time. In fact, the disk rotates coherently, therefore all the points cover the same angle during the same time interval.
Then, the tangential acceleration of a generic point on the disk is related to the angular acceleration [tex]\alpha[/tex] by the following relation:
[tex]a_{tan} = \alpha r[/tex]
where r is the distance of the point from the center of the disk.
Therefore, if we call [tex]r_P[/tex] the distance of point P from the center and [tex]r_Q[/tex] the distance of point Q from the center, we can find the ratio of the tangential accelerations between the two points:
[tex] \frac{a_{tanP}}{a{tanQ}} = \frac{r_P \alpha}{r_Q \alpha} = \frac{r_P}{r_Q} [/tex]
So, the larger is the distance of the point from the center, the larger is the tangential acceleration.
7.
Which is the best example of a hypothesis?
Water changes into steam if it is boiled.
If water is boiled, it will turn into steam.
If the temperature of water is increased, then it will change into steam.
When the temperature of water is increased, it changes into steam.
Answers
Answer:
C. If the temperature of water is increased, then it will change into steam is stating a hypothesis.
Explanation:
The acceleration produced by an unbalanced force acting on an object is _____ proportional to the magnitude of the force.
Answers
If 9.5 waves break on a beach in 1.0 minute what is the frequency answer
Answers
Number of waves = 9.5
Time = 1.0 minute
First, as frequency is (1/s), we need to convert time into seconds:
Time = 1.0 minute = 60 seconds.
Frequency of 9.5 waves = 9.5 / 60 = 0.158 Hz ≈ 0.16 Hz
So the answer is: 0.16 Hz!
-i
The james webb space telescope is designed primarily to observe __________.
Answers
The correct answer is: infrared light.
(The James Webb Space Telescope is designed primarily to observe infrared light.)
-i
The James Webb Space Telescope is primarily designed to observe infrared radiation, allowing astronomers to view distant galaxies and the earliest stars after the Big Bang. It's equipped with a 6.5-meter diameter mirror and is currently in a stable orbit point around 1.5 million kilometers from Earth.
Explanation:The James Webb Space Telescope (JWST) is designed primarily to observe infrared radiation from the cosmos. This incredible space telescope was launched in December 2021 and is equipped with a mirror measuring 6.5 meters (21 feet) in diameter, composed of 36 small hexagons, similar to the Keck telescopes. It's named after James Webb, an early NASA administrator.
This telescope will allow scientists to peer farther out in space and back in time than ever before since it's designed to detect far-infrared and millimeter-wave radiation from distant galaxies, whose light has been shifted to long wavelengths because of the vast distances it hastraveledd to reach us. One of the major goals of the JWST is to observe the light of the first galaxies and stars that came into existence after the Big Bang, approximately half a billion years later.
Observing these wavelengths is crucial as it allows us to gather data that are hidden from visibility due to dust clouds surrounding these galaxies. The JWST is expected to expand our understanding of the universe by providing an unrivaled view of the cosmos.
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What has more inertia: a full water bottle sitting on a desk, or a football player running with the ball?
Answers
Now the question is would it be easier to make the water bottle move or to make the football player stop?
It is easier to make the bottle move than stop the football player. Since the running football player shows more resistance to a change in its motion, then it has more inertia.
Final answer:
A football player has much more inertia than a full water bottle because inertia is directly related to an object's mass, and the player's mass is significantly greater than that of the water bottle. This greater mass results in the player's motion being minimally affected when catching the football, illustrating the player's higher level of inertia.
Explanation:
The question of which has more inertia, a full water bottle sitting on a desk or a football player running with the ball, centers around the concept of mass as the quantifiable measure of an object's inertia. Inertia, by definition, is the resistance of any physical object to any change in its state of motion, including changes to its speed and direction. An object with more mass has more inertia since it requires more force to change its motion.
Through this lens, the football player has much greater mass compared to a water bottle, hence significantly more inertia. Despite the football having a higher velocity when thrown, the player's mass makes his momentum and inertia far greater. This concept is illustrated when considering the effect on motion during the act of catching: the player's motion is only slightly affected because his greater mass (and thus inertia) absorbs the change with minimal alteration in speed or direction.
This observation aligns with the fundamental principles of momentum which state that momentum (mass times velocity) of an object is directly related to both its mass and velocity. However, in the context of inertia, it is the mass component that is most influential in determining the effect of external forces on an object's motion.
the speed of light in a piece of plastic is 2.00x10^8 meters per second what is the absolute index of refraction of this plastic
Answers
[tex]v= \frac{c}{n} [/tex]
where c is the speed of light in vacuum ([tex]c=3\cdot 10^8 m/s[/tex]), while v is the speed of light in the medium ([tex]v=2 \cdot 10^8 m/s[/tex]). Re-arranging, we can find the refractive index of this plastic:
[tex]n= \frac{c}{v}= \frac{3 \cdot 10^8 m/s}{2 \cdot 10^8 m/s}=1.5 [/tex]
A box of mass 50 kg is pushed hard enough to set it in motion across a flat surface. Then a 99-N pushing force is needed to keep the box moving at a constant velocity. What is the coefficient of kinetic friction between the box and the floor? 0.23 0.18 0.20
Answers
Therefore, since the resultant of the two forces must be zero,
[tex]F-F_f=0[/tex]
so
[tex]F=F_f[/tex]
The frictional force can be rewritten as
[tex]F_f = \mu m g[/tex]
where [tex]m=50 kg[/tex], [tex]g=9.81 m/s^2[/tex]. Re-arranging, we can solve this equation to find [tex]\mu[/tex], the coefficient of dynamic friction:
[tex]\mu = \frac{F}{mg}= \frac{99 N}{(50 kg)(9.81 m/s^2)} =0.20[/tex]
The time between high and low tide when the current changes direction is called ____.
Answers
Which statements best describe science? Check all that apply. A)Science uses beliefs and opinions to construct explanations. B)Science is resistant to new information. Science is supported by facts and processes. C)Science involves observation and experimentation. D)Science continually changes and is constantly updated.
Answers
Answer:
Science is supported by facts and processes.
Science involves observation and experimentation.
Science continually changes and is constantly updated.
Options A, C, and D are statements best describe science. Another approach to defining science is that it is the information gained through experience.
What is science?Science is knowledge about the physical world and the things that occur within it. It is an objective observation that explains nature's fundamental rules.
The statements best describe science will be;
A)Science is supported by facts and processes.
C) Science involves observation and experimentation.
D) Science continually changes and is constantly updated.
Hence options A, C, and D are statements best describe science.
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What is a wavelength of sound wave moving at 340m/s with frequency of 256hz
Answers
f = 256 Hz
lambda (wavelength)
v = f*lambda
340 = 256 * lambda
340/256 = lambda
lambda = 1.328 m
8. A 300g mass hangs at the end of a string. A second-string hang from the bottom of that mass and supports a 900g mass. (a) Find the tension in each string when the masses are accelerating upward at 0.700m/s2 . (b) Find the tension in each string when the masses are accelerating downward at 0.700m/s2 .
Answers
Tension A=?
Tension B=?
Then convert grams to kilograms
1kg = 1000g
300g= 0.3 kg
900g= 0.9kg
Given:
mA= 0.3kg
mB= 0.9kg
how? W=mg
g= 9.8 m/s^2
ay= 0.700m/s^2
WA= 2.94N
WB= 8.82N
For A [Tension A-Weight A - Tension B=mAay]
TA - 2.94 - TB=0.3kg(0.700m/s^2)
TA - 2.94 - TB = 0.21 N
TA - TB = 0.21N + 2.94 N
TA - TB = 3.15 N
* refer TB from below*
TA - TB = 3.15N
TA - 9.45N = 3.15N
TA = 3.15N + 9.45N
TA = 12.6N
For B F = ma
Summation of forces along y-axis = mBay
-8.82 N + TB = 0.9 kg(0.700 m/s^2)
-8.82N + TB = 0.63 N
TB = 0.63 N + 8.82 N
TB = 9.45 N
If this atom has a balanced charged, how many protons would you expect to find in this atom?
A) 4
B) 0
C) 6
D) 2
Answers
There are 6 - electrons so there would be 6 + protons.
Answer is C.
If this atom has a balanced charged, 6 protons will be expected to be present in the atom.
WHAT IS A BALANCED CHARGE?A balanced charge in an atom refers to an even or same amount of the positive and negative subatomic particles in the atom.
This further means that the number of protons (+) and electrons (-) in the atom will be equal for there to be a balanced charge.
Based on the image provided in this question, there are 6 electrons (-) in the atom, hence, 6 protons must be present to have a balanced charge in the atom.
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which country is bordered by both ecuador and venezuela
A. colombia
B. guyana
C. french giana
D. suriname
Answers
The answer is A.
Columbia is country situated in the northwest of South America. Colombia shares a border to the northwest with Panama, to the east with Venezuela and Brazil and to the south with Ecuador and Peru. Colombian territory also encompasses Pacific coastlines in the west.
the corect answer is a