Which form of energy is converted to electrical energy in a voltaic cell?.

Answer:

your hand will be heat you will feel small pain inside your hand

Answer:

In the hearts of stars:

Theory tells us the elements heavier than iron are created by novas

that is when a star explodes, and any heavier elements were once created when a star exploded.

A ball held over a person's head | a ball rolling on the floor is an example of an object that has potential energy followed by an object that has kinetic energy.

This is the type of energy possessed by a body by virtue of its motion or movement.

The rolling ball therefore has kinetic energy while a ball being held over a person's head has potential energy which is the energy possessed by a body by virtue of its position.

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The Resistance of the wire that makes up the heating element of the toaster is 13.75Ω.

What is Resistance?

Resistance is the measure of the opposition to current flow in an electrical circuit.

S.I. Unit of resistance is ohms, symbolized by the Greek letter omega (Ω)

Also from Ohm's Law,[tex]R=\frac{V}{I}[/tex]

From power-current relation

P=VI

Also, [tex]I=\frac{P}{V}[/tex]

[tex]I = \frac{1050}{120}[/tex]

I = 8.75 A

From Ohm's Law,[tex]R=\frac{V}{I}[/tex]

[tex]R = \frac{120}{8.75}[/tex]

R = 13.75 Ω

The Resistance of the wire is 13.75 Ω

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Answer: the force when the catapult swings has the same force as it does when coming down

Explanation:

for every reaction there is an equal opposite reaction

The student 4 measurement has the largest percent error. The discrepancy between the calculated value and the correct value is referred to as an "error" in statistics.

An error is a mistaken or erroneous action. In some contexts, an error is interchangeable with a mistake.

The complete question is

'Four students measured the acceleration of gravity. The accepted value for their location is 9.78m/s2. Which student’s measurement has the largest percent error?

A. Student 4: 9.61 m/s2

B. Student 3: 9.88 m/s2

C. Student 2: 9.79 m/s2

D. Student 1: 9.78 m/s2"

The percentage error is found as;

[tex]\rm \% error = \frac{a_A-a_E}{a_E} \times 100[/tex]

The percentage error in the gIven four students is obtained by putting the values in the given problem;

Student 1 ;

[tex]\rm \% error = \frac{9.78-9.78}{9.88}\times 100 \\\\\ \% error = 0 \%[/tex]

Student 2 ;

[tex]\rm \% error = \frac{9.78-9..79}{9.79}\times 100 \\\\\ \% error = - 0.10 \%[/tex]

Student 3 ;

[tex]\rm \% error = \frac{9.78-9.88}{9.88}\times 100 \\\\\ \% error = - 1.01 \%[/tex]

Student 4 ;

[tex]\rm \% error = \frac{9.78-9.61}{9.61}\times 100 \\\\\ \% error =1.77\%[/tex]

Student 4 reports the maximum percentage error.

Hence the student 4 measurement has the largest percent error.

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If you had a 14 m long timeline, the dinosaurs would be less than one meter from the end.

The extinction of species or organisms is the process by which some environmental factors cause a decline in the number of species through death.

Dinosaurs are some of the examples of species that are in extinct.

Since dinosaurs are in extinction, If you had a 14 m long timeline, the dinosaurs would be less than one meter from the end.

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Answer:

gravity

Explanation:

Answer:

Approximately [tex](-348\; {\rm J})[/tex], assuming that the bike was on level ground.

Explanation:

If an object of mass [tex]m[/tex] is moving at a speed of [tex]v[/tex], the kinetic energy of that object would be [tex](1/2)\, m\, v^{2}[/tex].

At a speed of [tex]v = 3.84\; {\rm m\cdot s^{-1}}[/tex], the kinetic energy of the bike and the cyclist- combined- would be:

[tex]\begin{aligned} &\frac{1}{2}\, m\, v^{2} \\=\; &\frac{1}{2}\times 53.0\; {\rm kg} \times (3.84\; {\rm m\cdot s^{-2}})^{2} \\ \approx \; & 390.76\; {\rm J}\end{aligned}[/tex].

At a speed of [tex]v = 1.27\; {\rm m\cdot s^{-1}}[/tex], the kinetic energy of the bike and the cyclist- combined- would be:

[tex]\begin{aligned} &\frac{1}{2}\, m\, v^{2} \\=\; &\frac{1}{2}\times 53.0\; {\rm kg} \times (1.27\; {\rm m\cdot s^{-2}})^{2} \\ \approx \; &42.741 \; {\rm J}\end{aligned}[/tex].

The energy change was approximately:

[tex]390.76\; {\rm J} - 42.741\; {\rm J} \approx 348\; {\rm J}[/tex].

If the bike was on level ground, the friction on the bike and the cyclist would have done a work of [tex](-348\: {\rm J})[/tex] to reduce the kinetic energy of the bike and the cyclist by that amount.

Answer: C) -348J

Explanation:

42.741 - 390.76 (the kinetic energy of the two speeds) is equal to -348.

Answer:

A

Explanation:

when  area increases pressure decrease

for example, a sharp nail's area is lower than a blunt nail, so sharp nail is easy to fix

so, here a exerts more pressure

Answer:

a

Explanation:

Diagonal of cardboard=displacement to hole

So displacement till edge

Total distance

From centre to hole displacement

The increase in velocity of the student per second is 10 m/s^2 and her change in momentum each second is 500 kgm/s^2.

The change in velocity of a moving object is known as acceleration.

For any object falling freely under gravity, the change in velocity per second or acceleration due to gravity is a constant and is equal to 10 metres per square second (10 m/s^2).

The change in momentum of a body is given as follows:

where m is mass, v is final velocity and u is final velocity.

Mass of the student = 50 Kg

Change in momentum each second = 50 kg × 10 m/s^2 = 500 kgm/s^2

Therefore, the increase in velocity of the student per second is 10 m/s^2 and her change in momentum each second is 500 kgm/s^2.

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Mario Molina helped to bring about the 1987 Montreal Protocol on substances that result in depletion of the Ozone Layer.

The topmost layer of the atmosphere which protect the harmful UV rays from the Sun to reach the Earth surface.

Mario Molina has the great contribution in science field. He tried hard and succeeded in passing an international agreement to eliminate CFCs also called as Chloro Fluoro Carbons and other ozone-depleting chemicals.

These CFCs were used in jet planes which depleted the ozone layer and a hole was observed over Antarctica.

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Answer:

40,000 m/s²

Explanation:

The formula is given as Force = mass × acceleration, so then acceleration = Force / mass.

Therefore...

5800 N ÷ 0.145 kg = 40,000 m/s²

The multimeter setting should you use is between 11-12 volts. If the voltage is too high or too low, the power supply must be changed.

An instrument made to measure resistance, voltage, and electric current, often across a range of values.

You think your desktop computer's power supply is malfunctioning. To test the power supply, you should use a multimeter.

Between 11 and 12 volts should be seen on the multimeter. The power supply is failing and has to be replaced if it's too high or too low.

Hence, the multimeter setting should you use is between 11-12 volts.

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Answer:

When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at a higher temperature until they both reach the same temperature.

Explanation:

The student notices that the electronic balance has a zero error, so it shows mass readings that are all slightly too small. This means that the density value is incorrect and slightly too small. The correct option is B.

The density is the ratio of the mass and the volume of the object. It is denoted by ρ.

ρ = mass/Volume = m/V

The student notices that the electronic balance has a zero error, so it shows mass readings that are all slightly too small.

As mass is directly proportional to density. The density will also be slight small when mass reading are all slightly small.

Thus, the correct option is B.

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Intensity is the property of sound waves that decreases as the square of the distance from the source increases. Option B is correct.

A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.

As the square of the distance from the source increases, the intensity of sound waves decreases.

Sound intensity relationship

[tex]\rm {I} = \frac{1}{r^2}[/tex]

[tex]\rm \frac{I_2}{I_1} =\frac{r_1^2}{r_1^2}[/tex]

Hence, option B is correct.

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According to Newton's first law of motion, the puck gradually slows down because friction would be acting on it.

Newton's first law of motion states that an object will remain at rest or move uniformly in a straight line unless acted upon by an external force.

According to this question, a hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.

However, in accordance with the first law of motion proposed by Newton, the puck gradually slows down because friction would be acting on it.

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Answer:B. The puck gradually slows down because friction would be acting on it.

Explanation:

The current flowing in resistor 1 in the given series circuit is determined as 1.0 A.

The equivalent resistance of the circuit is determined as follows;

Rt = R1 + R2

Rt = 15 + 5

Rt = 20ohms

The current flowing in the circuit is determined from Ohm's law.

V = IR

I = V/R

I = 20/20

I = 1.0 A

since it is series circuit, same current will flow in R1 and R2.

Thus, the current flowing in resistor 1 in the given series circuit is determined as 1.0 A.

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A solenoid has 18 turns per centimeter of its length. the solenoid is twisted into a circle so that it becomes shaped like a toroid, the magnetic field at the center of each turn of the toroid is mathematically given as

B=3.39292007×10^−5 T

Generally, the equation for magnetic field is mathematically given as

B=\mu_0 * n *I

Where

n=18

n=1800turns/m

Therefore

B=4*\pi*10^{-7}*1800*15*10^{-3}

B=3.39292007×10^−5T

In conclusion, the magnetic field at the center of each turn of the toroid is

B=3.39292007×10^−5T

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Answer:

See below

Explanation:

KE = 1/2 m v^2     multiply both sides by 2

2 (KE) = mv^2       divide both sides by m

2(KE) / m = v^2        sqrt both sides

√ [(2KE)/m ] = v

Answer:  B

Explanation:  AN increase in heat out

Given that the linear expansion of the pipe is 12×10¯⁶ K¯¹, the pipe extends by 0.024 mm

α = ΔL / L₁ΔT

12×10¯⁶ = ΔL / (100 × 20)

12×10¯⁶ = ΔL / 2000

Cross multiply

ΔL = 12×10¯⁶ × 2000

ΔL = 0.024 mm

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Considering the frames of reference, the robot has to fire backwards at a speed of 2m/s.

The relative velocity is obtained based on the inertial frame of reference. The term velocity is always measured relatively.

Given that the inertial frame of reference is relative to the moving frame then; 7m/s - 9 m/s = -2m/s.

It then follows that the robot has to fire backwards at a speed of 2m/s.

Missing parts:

Basim’s robotics team builds a robot that travels at 9 m/s and can fire a tennis ball at a target.

Which would result in a judge who is sitting beside the testing ground observing the tennis ball having a speed of 7 m/s?

The robot fires the ball forward with a speed of 7 m/s.

The robot fires the ball backward with a speed of 7 m/s.

The robot fires the ball backward with a speed of 2 m/s.

The robot fires the ball forward with a speed of 2 m/s.

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Answer:

C. the robot fires the ball backward with a speed of 2 m/s.

Atoms cannot be broken down into smaller pieces is the statement belongs to daltons atomic theory. Option B is correct.

The atom consists of matter that may be split without releasing electrical charges. It's also the smallest unit of matter with chemical element features.

The complete question is:

"Which statements belong to Dalton's atomic theory? Select all that apply.

A)Atoms cannot be created or destroyed.

B)Atoms cannot be broken down into smaller pieces.

C)All atoms of an element are identical.

D)Chemical reactions cause atoms to be rearranged."

According to Dalton's atomic hypothesis, atoms cannot be broken down into smaller bits.

Hence, option B is correct.

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The likely outcome when a magnetically soft material is placed in a strong magnetic field is that it will become a temporary magnet because the domains will easily realign.

A magnet is a material whose magnetic domains are properly aligned. These materials are able to attract other materials that are magnetizable.

Hence, the likely outcome when a magnetically soft material is placed in a strong magnetic field is that it will become a temporary magnet because the domains will easily realign.

Missing parts:

A magnetically soft material is placed in a strong magnetic field. What is the most likely outcome?

a. It will become a permanent magnet because the domains will remain aligned.

b. It will become a temporary magnet because the domains will remain aligned.

c. It will become a permanent magnet because the domains will easily realign.

d. It will become a temporary magnet because the domains will easily realign.

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Answer: D or It will become a temporary magnet because the domains will easily realign.

Explanation: Taking the quiz!

(a) The spring stiffness constant of the spring is 18,392 N/m.

(b) The time the car was in contact with the spring before it bounces off in the opposite direction is 0.23 s.

The kinetic energy of the car is calculated as follows;

K.E = ¹/₂mv²

K.E = ¹/₂ x 950 x 22²

K.E = 229,900 J

The stiffness constant of the spring is calculated as follows;

K.E =  U = ¹/₂kx²

k = 2U/x²

k = (2 x 229,900)/(5)²

k = 18,392 N/m

F = kx

F = 18,392 x 5

F = 91,960 N

F = mv/t

t = mv/F

t = (950 x 22)/(91960)

t = 0.23 s

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The human population which grows by about 2 percent each year, is showing linear growth.

A linear increment occurs when a sequence increases gradually with a constant value.

If a population increases at the rate of 2%, the incremental rate or constant factor is 2%, thus, we can conclude that the human population which grows by about 2 percent each year, is showing linear growth.

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