How much energy in joule does the heater deliver in 7 secondsThe heater has a power output of 3kW

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Answer 1

Answer:

Answer:

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23°C = ______ K 23 296 -250 123

Which biogeochemical cycle is relied upon for plant photosynthesis? 1)Phosphorus 2)Nitrogen 3)Carbon 4)Hydrologic

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I think the correct answer would be carbon. It is the Carbon cycle that is relied upon for plant photosynthesis. One of the important substance needed for photosynthesis to occur is carbon dioxide so it should be involved in the carbon cycle.

carbon because we breath out carbon and plants eat it bascially

Two physics students, Ben and Bonnie, are in the weightlifting room. Bonnie lifts the 50 kg barbell over her head (approximately .60 m) 10 times in one minute; Ben lifts the 50 kg barbell the same distance over his head 10 times in 10 seconds. Which student does the most work? Which student delivers the most power? Explain your answers.

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Final answer:

Both students do the same amount of work, but Ben delivers more power due to completing the work in a shorter time.

Explanation:

In this case, both Ben and Bonnie are lifting the same 50 kg barbell over their heads, but they are doing it at different rates. Bonnie lifts the barbell 10 times in one minute, which means she is doing the work over a longer period of time. Ben, on the other hand, lifts the barbell 10 times in 10 seconds, doing the work in a shorter amount of time.

The amount of work done is equal to the force exerted multiplied by the distance moved. Since the mass and distance are the same for both students, the work done is equal. However, power is defined as the rate at which work is done, which is calculated by dividing the work done by the time taken to do it. Since Ben completes the work in a shorter period of time, he delivers more power than Bonnie.

Therefore, Ben does the most work and delivers the most power.

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Answer:

Both of them

Explanation:

What is reflection? Reflection is light that has struck a surface and has __________. . gained energy.
been transmitted.
bounced off .
been absorbed

Answers

The correct answer should be bounced off since the light ray hit the surface and reflected towards a new location. It therefore bounced off.

Correct answer choice is :

C) Bounced off

Explanation:

Reflection is the difference in the path of a wavefront at an interface within two various media so that the wavefront returns into the tool from which it began. Current models involve the reflection of light, sound and water waves. Reflection is when light bounces off an object. If the cover is soft and shiny, like glass, water or bright metal, the light will reflect at the same point as it hit the cover.

In a ballistic pendulum experiment, projectile 1 results in a maximum height h of the pendulum equal to 2.6 cm. A second projectile (of the same mass) causes the the pendulum to swing twice as high, h2 = 5.2 cm.The second projectile was how many times faster than the first?

Answers

Answer:

Second projectile is 1.4 times faster than first projectile.

Explanation:

By linear momentum conservation

Pi = Pf

m x U + M x 0 = (m + M) x V

$U= ((m + M)* V)/(m)$

Now Since this projectile + pendulum system rises to height 'h', So using energy conservation:

KEi + PEi = KEf + PEf

PEi = 0, at reference point

KEf = 0, Speed of system zero at height 'h'

$KEi = ((m + M)* V^2)/(2)$

PEf = (m + M) g h

So,

$((m + M)* V^2)/(2) + 0 = 0+ (m + M) g h$

$V =\sqrt {2gh}$

So from above value of V

Initial velocity of projectile =U

$U=((M+m)√(2gh))/(m)$

Now Since mass of projectile and pendulum are constant, So Initial velocity of projectile is proportional to the square root of height swung by pendulum.

Which means

$(U_2)/(U_1)=\sqrt{(h_2)/(h_1)}$

$U_2=\sqrt{(h_2)/(h_1)}* U_1$

$U_2=\sqrt{(5.2)/(2.6)}* U_1$

U₂ = 1.41 U₁

Therefore we can say that ,Second projectile is 1.4 times faster than first projectile.

Final answer:

In a ballistic pendulum experiment, if the pendulum swings twice as high with the second projectile as with the first, the speed of the second projectile must have been twice the speed of the first projectile.

Explanation:

In a ballistic pendulum experiment, the relation between speed of the particle and maximum height achieved by the pendulum relies on the law of conservation of energy. The kinetic energy of projectile (which is proportional to the square of the speed) gets converted into potential energy of the pendulum and hence the square of the speed of the particle is directly proportional to the maximum height achieved by the pendulum.

Given that the second projectile causes the pendulum to swing twice as high, the initial kinetic energy of the second projectile (and hence the square of its speed) must be four times that of the first. Thus, the speed of the second projectile must have been twice the speed of the first projectile, because the square root of 4 is 2.

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1) Un perito fue encomendado para determinar si un trozo de metal muy parecido al oro de 0,75 kg. Y de volumen 340 cm3. Era en verdad dicho metal, use las características de la densidad de un cuerpo para ayudar al perito.

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Answer:

Primero, sabemos que la densidad de el oro es:

Densidad = 19.3 g/cm^3

Sabemos que nuestro metal tiene una masa de 0.75 kg, y un volumen de 340 cm^3.

Primero deberíamos reescribir la masa en gramos, pues la densidad está escrita en gramos.

Sabemos que:

1 kg = 1000g

Entonces:

0.75 kg es 0.75 veces 1000g, esto nos da:

0.75kg = 0.75*(1000g) = 750g

Entonces tenemos:

masa = 750g

volumen = 340cm^3

Ahora debemos recordar que:

densidad = masa/volumen

Entonces la densidad de este metal es:

densidad = 750g/340cm^3 = 2.21 g/cm^3

Si la comparamos con la densidad del oro, podemos ver que esta es mayor.

Entonces podemos concluir que este metal no es oro.

Why were behaviorists unlikely to view cognition as a part of learning?

Answers

Behaviorists are unlikely to perceive cognition as part of learning because they believed that learners respond to stimulus. It is the negative and the positive reinforcement that the learners receive that shape their behaviors or responses to certain stimuli and not cognition.

Answer:

Cognition is unobservable.

Explanation:

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What is the difference in electrical potential energy between two places in an electric field?A. current B. resistance C. potential difference D. induction

Which of the following statements about iron filings placed upon glass resting on top of a bar magnet is false? A. The density of the filings will match the intensity of the magnetic field. ield outlined by the filings will be from the north pole of the magnet to the south pole. C. The filings will be clustered more densely where the field is weakest. D. The filings will sit on the glass on curved paths between the north and south poles.