1) when we light a matchstick,the energy which got consumed in while rubbing the matchstick against the surface,turns into heat and hence ,it lights , therefore,the energy gets transferred from one type to another which proves the law of conservation of energy.
2) The coal gets burn and generate into electricity which further used by us for various purposes like lighting lamp and since the energy gets transferred from one source to another instead of ceasing, it proves the statement of conservation of energy.
3) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will come to rest .
4) No ,it doesn't , because due to the force of friction,the disturbance in the movement of it ,takes place, making it stop at a specific point after some time.
5) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will eventually come to rest .
6)
Mass (m)⇢15000 gram = 15 kgHeight(h)⇢0.8 metersAcceleration due to gravity(g)⇢9.8m/s²Potential energy ⇢mghPotential energy ⇢(15 x 9.8 x 0.8 )JPotential energy ⇢117.6 J7)
Mass (m)⇢15000 gram = 860 kgHeight(h)⇢32metersAcceleration due to gravity(g)⇢9.8m/s²kinetic energy ⇢mghkinetic energy ⇢(860 x 9.8 x 32 )Jkinetic energy ⇢269,696 J8) In the previous problem ,the kinetic energy increases as continues rolling and the potential energy decreases in this process of prolongation of the movement ,while ,when an object comes to rest after the process of moving or falling, it's potential energy is at the highest while the kinetic energy is just the opposite .
9)
Mass (m)⇢ 1000kgHeight(h)⇢18 metersAcceleration due to gravity(g)⇢9.8m/s²Kinetic energy ⇢mghKinetic energy ⇢(1000x 9.8 x 18 )JKinetic energy ⇢176,400 J10)
Mass (m)⇢ 2000 gm = 2kgHeight(h)⇢6metersAcceleration due to gravity(g)⇢9.8m/s²Kinetic energy ⇢mghKinetic energy ⇢(2x 9.8 x 6 )JKinetic energy ⇢117.6 J11)
In perfectly elastic collision, there's no loss of energy, hence ,the energy that got used up in the starting to bounce the ball ,will remain the same throughout the whole collision and the height would be the same 6 meters and kinteic energy would be 117.6J
Which name is given to the force that stretches the spring with a metal that weights it down
Answer:
gravity
Explanation:
ok what i understand from your query is that a spring balance with a metal piece attached to it is weighing it down, a spring balance is measured in newtons (f=ma), the acceleration part is gravity (-9.81 m/s^2). The metal piece is attached to the string.
hope this answers your question and please take my answer with a grain of salt and refer to some webpages or videos
explain the concept of force by practical examples of daily life
Answer:
a bicycle moving
Explanation:
due to the force that is applied towards the wheels of a bicycle and also gravitation the wheels. of a bicycle are therefore able to move
Mike stands on a scale in an elevator. If the elevator is accelerating upwards with 4.9 m/s2, the scale reading is ____ times Mike's weight.
Answer:
F - M a force exerted by scales on student
M a = M (9.8 + 4.9) m/s^2 upwards chosen as positive
a = 1.5 g net acceleration of student due to force of scales
W =M g weight of student (actual weight)
Wapp = M 1.5 * g apparent weight (on scales) of student
In an elevator which is accelerating upwards with 4.9 m/[tex]s^{-2}[/tex], Mike's weight will be 1.5 times the actual weight.
In the question, it is given that the lift is accelerating upwards with 4.9 m/[tex]s^{-2}[/tex] Let Mike's weight be "m", "g" is acceleration due to gravity and "a" be the upward accelerationThe upward acceleration of lift = 4.9 m/[tex]s^{-2}[/tex]As the lift is accelerating upwards, the apparent weight (R) = m (g+a)Apparent weight R = m*(9.8+4.9) NApparent weight R = m*(9.8+4.9)/9.8 KgfApparent weight R = m*1.5Hence, the apparent weight will be 1.5 times the real weight.
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Mass is measured in what unit and what tool is used
→ Mass is measured in(unit)
kilogram (kg) nd smaller mass in gram(g)→ The tool which is commonly used
triple beam balance electronic balanceweighing machinend many more......
__________________☃️[tex]\sf{\:мѕнαcкεя\: ♪...}[/tex]
Answer:
→ Mass is measured in(unit)
kilogram (kg) nd
smaller mass in gram(g)
→ The tool which is commonly used
triple beam balance
electronic balance
weighing machine
Explanation:
Four point charges, each of magnitude 2.38 µC, are placed at the corners of a square 75.2 cm on a side. If three of the charges are positive and one is negative, find the magnitude of the force experienced by the negative charge. The value of Coulomb’s constant is 8.98755 × 10^9 N · m^2/C^2 . Answer in units of N.
Answer:
The Electric Force on Negative Charge is 2.968 N
Explanation:
charge on each corner, q = 2.38 micro coulomb
Side of square, a = 75.2 cm
Coulombic constant, K = 8.98755 x 10^9 Nm²/C²
sides of the square are A,B,C and D
and all sides of a square are equal so
AB = BC = CD = DA = 75.2 cm = 0.752 m
Diagonal, AC = BD = 1.414 x 0.752 = 1.06 m
Electric field at D due to charge at A
EA= Kq÷AB^2
= 8.98755×10^9 × 9.87×10^-6 ÷ 0.752^2
EA= 156863.82 N/C
Similarly Electric field at D due to charge C
EC=Kq÷CD^2
= 8.98755×10^9 ×9.87×10^-6 ÷ 0.752^2
EC= 156863.82 N/C
Electric field at D due to charge at BB
EB=Kq÷BD^2
EB=8.98755×10^9 × 9.87×10^-6 ÷ 1.06^2
EB=78949.01 N/C
Resolve the compoents
Ex = EA + EB cos 45
Ex = 156863.82 + 78949.01 x 0.707
Ex = 212689.2 N/C
Ey = EC + EB Sin 45
Ey = 156863.82 + 78949.01 x 0.707
Ey = 212689.2 N/C
The resultant electric field is
E = 1.414 x 212689.2 = 300787.95 N/C
the electric force on the negative charge is
F = q x E
F = 9.87 x 10^-6 x 300787.95
F = 2.968 N
Which of the following describes the conditions for an inelastic collision?
(A) momentum conserved, kinetic energy conserved
(B) momentum conserved, kinetic energy not conserved
(C) momentum not conserved, kinetic energy conserved
(D) momentum not conserved, kinetic energy not conserved
Answer: I think it is C.
Explanation: In an inelastic collision, the object hits the item and stays with it. Therefore, both momentum and kinetic energy need to be presen.t
Ten reasons why we study physics
Explanation:
You Can Solve Problems. ...
A Wide Range Of Career Opportunities. ...
It Keeps You On Your Toes. ...
It Complements Different Subjects, Such As Maths. ...
It Gives You A Challenge. ...
You Could Work Overseas. ...
Acquire Skills Valuable To Employers.
Appreciate Modern Technology
Embrace Post Graduate Research Opportunities
Identify three resources that are mined from the Earth's crust.
Answer:
Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, which forms the mineralized package of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, dimension stone, rock salt, potash, gravel, and clay.
Explanation:
Answer:
Three resources that are mined from earth's crust are:
-Coal
-Gold
-Iron ore
Some more are:
-Aluminum
-Copper
-Lime
-Phosphate rock
-Gypsum
-Sand
-Gravel
-Rock
etc.
Explanation:
Have a great rest of your day
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Hello people ~
please help me with thie question attached above.
Thanks in advance!
Answer:
W = 1/2 x P x E
Explanation:
Let :
P = electric dipole momentE = uniform electric fieldα = initial angleβ = final angleFormula
The work done in a electric field can be found using the formula :W = P x E x (cosα - cosβ)Solving
W = P x E x (cos0° - cos60°)W = P x E x (1 - 1/2)W = 1/2 x P x ELet's see
[tex]\\ \rm\rightarrowtail W=P\vec{E}(cos\theta_i-cos\theta_f)[/tex][tex]\\ \rm\rightarrowtail W=P\vec{E}(cos0-cos60)[/tex]
[tex]\\ \rm\rightarrowtail W=P\vec{E}(1-1/2)[/tex]
[tex]\\ \rm\rightarrowtail W=\dfrac{P\vec{E}}{2}[/tex]
When the wheel of a cart rolls from a smooth sidewalk onto a plot of grass, the interaction of the wheel with the blades of grass slows the wheel. What slows light when it passes from air into glass or water
The light oscillates electrons which then absorbs some of the energy and reemit it thereby causing a delay.
What are Electrons?This is defined as a subatomic particle which has a negative charge. In the glass of water the light oscillates the electrons which absorbs some energy.
The re-emission is what slows light when it passes from air into glass or water.
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In three to four sentences, explain how climate change could impact the formation of hurricanes. (4 points)
The climate change can directly impact the formation of hurricanes because increasing temperature increases intensity of hurricanes.
How climate change could impact the formation of hurricanes?Evaporation increases as temperatures rise which also causes the transfer of heat from the oceans to the atmosphere. As the storms travel across oceans whose water is warm, they absorb more water vapor and heat which increases rainfall as well as intensity of hurricanes.
So we can conclude that the climate change impacted the formation of hurricanes due to increasing temperature that increases intensity of hurricanes.
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A wooden block of a mass of 2.0kg is 20cm thick by 10cm wide by 30cm tall.
calculate the minimum and maximum pressure this block could exert on the surface ?
Answer:
See below ↓↓
Explanation:
Formula
Pressure = Force/AreaForce
It will be constant in both cases as mass remains the samF = mg = 2 x 10 = 20 NCase (i) : Maximum Pressure
Area has to be minimumA = 10 x 20 = 200 cm² ≅ 0.02 m²P = F/A = 20/2 x 10⁻² = 1000 PaCase (ii) : Minimum Pressure
Area has to be maximumA = 30 x 20 = 600 cm² ≅ 0.06 m²P = F/A = 20/6 x 10⁻² = 3.33 x 10² = 333 PaAn object orbiting the sun in an ellipse can be said to be:.
Answer:
always accelerating
Explanation:
Answer:
B. Always accelerating
Explanation:
I recently did a review with an identical flashcard!
A plane's propeller has a rotational inertia of 2.0kg * m ^ 2 After a clockwise torque of 4.0Nm was applied to the propeller for 4.0s, the propeller has a clockwise angular speed of 24 * (rad)/s What was the initial angular momenturn of the propeller before the torque was applied ?
The initial angular momentum of the propeller before the torque was applied will be 32 kg m²/s.
What is torque?Torque is the force's twisting action about the axis of rotation. Torque is the term used to describe the instant of force. It is the rotational equivalent of force. Torque is a force that acts in a turn or twist.
The amount of torque is equal to force multiplied by the perpendicular distance between the point of application of force and the axis of rotation.
The given data in the problem is;
The rotational inertia is,I = 2.0 kg m²
The clockwise torque is, T = 4.0Nm
The time period is,t= 4.0s,
The angular speed is,ω= 24 * (rad)/s
The initial angular momentum of the propeller is,I₀
The angular acceleration is found by the relation;
[tex]\rm \tau = I \times \alpha \\\\ \alpha =\frac{\tau}{i} \\\\ \alpha =\frac{4.0}{2.0} \\\\ \alpha= 2.0 \ rad/sec^2[/tex]
The initial angular velocity is found as;
[tex]\rm \omega_f = \omega_0 + \alpha t \\\\ \omega_0 = \omega_f -\alpha t \\\\ \omega_0 =24 -[(-2.0)\times 4.0)] \\\\ \omega_0 = 16 \ rad/sec[/tex]
The initial angular momentum of the propeller is found as;
[tex]\rm L_0 = I \omega_0 \\\\ L_0 = 20 \times (1.6) \\\\ I_0 = -32 \ kgm^2/s[/tex]
Hence,the initial angular momentum will be 32 kg m²/s.
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Answer: 14 kg•m2/s
Explanation:
Trust me it’s from khan
1.0 A weightlifter picks up a barbell.
1.1 .10. Which type of energy is stored in the barbell when it is held above the weightlifter's head?
[1 mark]
Put an X in one box only.
11
Chemical potential
Elastic potential
Gravitational potential
Kinetic
The type of energy is stored in the barbell when it is held above the weightlifter's head is gravitational potential energy.
What is potential energy?This is the type of energy possessed by an object due to its position above te ground level.
Potential energy of an object is given by the following formulas;
P.E = mgh
where;
m is mass of the objecth is the height above the groundg is gravityThus, the type of energy is stored in the barbell when it is held above the weightlifter's head is gravitational potential energy.
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who would benefit of your own handled problem?why?
Answer:
Define the problem . what's exactly going on ?
- set some goals
- examine the consequences
- put your solution into practice
- brainstorm possible solutions
- Team working
Explanation:
ANY PROBLEM RELATED TO MANI CUSTOMER BILLING ACCOUNTING IN BOOKKEEPING ETC
NING A WAY TO MAKE THE COMPANY MORE PRODUCTS FIDABLE THROUGH NEW SERVICE OR PRODUCT OFFERING NEW PRICING IDEA PROMOTING AND SALES IDEA
How much work can a 1000-watt motor do in 5.0 seconds?
A. 4.0 × 101 J
B. 2.0 × 102 J
C. 5.0 × 103 J
D. 2.5 × 104 J
Answer:
C
Explanation:
watt = j/sec and work = j
so multiply watt * sec to get work
1000 j/sec * 5 sec = 5000 j = 5 x 10^3
How many electrons do most atoms seek to have in their outermost shell, causing covalent bonds to form? 1 3 4 8
Answer:
8
Explanation:
It is because the outermost energy level carries a maximum of 8 electrons
8 electrons do most atoms seek to have in their outermost shell, causing covalent bonds to form
What is a covalent bond?The interatomic bond is formed when two atoms share an electron pair. The electrical attraction of their nuclei for the identical electrons causes the binding.
When the total energy of the bound atoms is lower than that of widely spaced atoms, a covalent bond is formed.
When an atom's outermost electron shell is full, it is the most stable and least reactive. The octet rule states that most key biological elements require eight electrons in their outermost shell to be stable.
Hence 8 electrons do most atoms seek to have in their outermost shell, causing covalent bonds to form
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BRAINLIEST!!! how did the intensity of a sound wave change if the distance from the source is decreased by a factor of 2? Right answers only!!!
a. the intensity increases by a factor of 4
b. the intensity increases by a factor of 2
c. the intensity decreases by a factor of 2
d. intensity decreases by a factor of 4
Answer:
D.
Explanation:
The answer should be D. because if it increases by a factor of 2 then it will decrease at a factor of 4.
I hope it helps! Have a great day!
Anygays-
When the reflecting wave flips upside-down on a stretched
string, which of the following is correct?
a The stretched string is with a fixed boundary
b The stretched string is with a free boundary
с
The stretched string may have a fixed boundary or
a free.
d The given information is not enough.
e None of the above is correct.
The reflecting wave flips upside-down on a stretched string when the wave moves from a less dense part of the rope moves toward a boundary that has a higher density. Hence the correct answer is (Option E).
What is a Reflecting Wave?A reflecting wave is a wave that abruptly changes its propagation direction when it hits the boundary between two media.
An echo is a real-world example of a reflecting wave.
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Which sound frequency could a human detect? 1 hertz 10 hertz 50 hertz 50,000 hertz.
Answer:
Good human ears can detect sound from about 50 Hz to about 20,000Hz (20 kHz); this can be called the audible range of frequencies.
so c.50 hertz
Explanation:
Hope it helps :)
Answer:
50 hertz
Explanation:
This is right
HELP PLEASE ILL GIVE BRAINLY
Can you jump and fall at the same time?
i hate you right now..... im gonna be thinking about this all day now....... ohhhhhhh no i need my 5 monsters now cause i aint sleepin now......
Mars moves in an elliptical orbit around the Sun. The location of the Sun relative to this ellipse is
Answer:
It is when the focus of the ellipse that is closer to the point where Mars is moving the fastest.
Explanation:
I hope it helps! Have a great day!
Anygays-
Which of the following best describes how a climate change affects the organisms in a certain environment? (2 points) Group of answer choices They might have more resources that help them survive. The will move to a new location where resources are available. They will struggle to survive due to reduced space. They might adapt, move to new place, or struggle to survive.
Answer:
they might adapt or move to a new place
Explanation:
A police car is asked to overtake a red sedan that is 16 km ahead of it on the freeway. The red sedan is traveling at 80 km/hr and the police car travels at 100 km/hr. When will the police car overtake the sedan?
Answer:
S = v0 t + 1/2 a t^2 a = 0 seems given in the problem
Vp t = Vr t + 16
both travel for time t but the police car is going faster and travels 16 km farther
t (Vp - Vr) = 16
t = 16 km / (100 - 80) km/hr
t = 16 / 20 hr = 4/5 hr = 48 min
Which of the following is the measure of average kinetic energy of the particles in a
substance?
А
Diffusion
B
Atmospheric Pressure
С
Temperature
D
Vapor Pressure
Answer:
The correct answer is C
Explanation:
Hope this helped :)
if im wrong pls tell me.
The main factors in determining your speed on an acceleration lane are:.
Answer:
amount and speed of traffic on the acceleration lane and expressway.
What is the result of a short circuit that bypasses all resistors in a circuit?
Answer:
All of the current flows through the short circuit branch and Bypasses the other branches. This causes the excessive amount of current to flow since there is practically no resistance. Short-circuit across the power supply can damage or destroy it.
Explanation:
Hope this helps you!
Question #18:
A steam engine (assume a Carnot engine) has an efficiency of 34.8%. If the waste heat has a temperature of 76 °C, what is the temperature of the boiler? Answer in units of °C.
The temperature of the boiler of the steam engine at the efficiency of 34.8% and waste heat temperature of 76 °C, is determined as 116.56°C.
Efficiency of a Carnot engineThe efficiency of a Carnot engine is determined using the following formula;
n = 100% x (TH - TC)/TH
where;
TH is the temperature of the hot reservoirTc is the temperature of the cold reservoir34.8% = 100% x (TH - 76)/TH
0.348 = (TH - 76)/TH
0.348TH = TH - 76
0.652TH = 76
TH = 76/0.652
TH = 116.56°C
Thus, the temperature of the boiler of the steam engine at the efficiency of 34.8% and waste heat temperature of 76 °C, is determined as 116.56°C.
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