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4 years ago

Which choice correctly describes what happens during heating?

Physics

1 answer:

Masja [62]4 years ago

7 0

Answer:

Option 4

Explanation:

During heating actually heat transfer takes place from a body at higher temperature to a body at lower temperature and the heat transfer takes place until both attain the same temperature

Therefore heat transfer depends on the temperature of the systems

Now while comparing the thermal energies of the systems, if both the systems have same mass then the system which is at higher temperature has greater thermal energy when compared to the system which is at lower temperature

So in this case assuming that both the systems have same mass then the energy will leave the system with greater thermal energy and go into the system with less thermal energy as the system with greater thermal energy in this case will be at higher temperature and we are considering this assumption because thermal energy not only depends on temperature but also depends on mass of the system

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A horse pulls a barge along a canal using a rope 10m

marta [7]

Answer:

Explanation:

Here the rope is 10m long and making an angle of θ with the direction of canal or direction of flow of water in the canal .

sinθ = 2 / 10 = .2

θ = 11.5⁰

a )

Component of 500 N along the line perpendicular to the canal

= 500 sinθ

= 500 sin 11.5

= 100 N

b )

component of 500 N along the canal

= 500 cos 11.5

= 490 N approx .

8 0

4 years ago

A puck sliding on ice approaches a 20 degrees ramp at 10 m/s with coefficient of friction 0.2. How high will it go up the ramp a

timama [110]

Answer:

it will go up along the inclined plane by d = 9.62 m

Explanation:

As we know that puck is moving upward along the slide

then the net force opposite to its speed is given as

$F_{net} = - mgsin\theta - \mu mgcos\theta$

so here deceleration is given as

$a = -g(sin\theta + \mu cos\theta)$

now plug in all values in it

$a = -9.81(sin20 + 0.2cos20)$

$a = -5.2 m/s^2$

now the distance covered by the puck along the plane is given as

$v_f^2 - v_i^2 = 2 a d$

$0 - 10^2 = 2(-5.2)d$

$d = 9.62 m$

3 0

4 years ago

Why is it important to understand the behavior of light when designing and building any type of structure, such as a house, scho

geniusboy [140]

Answer:

because it is important

5 0

4 years ago

a small 20-kilogram canoe is floating downriver at a speed of 2m/s what is the canoes kinetic energy?

Vladimir [108]

KE = 1/2mv²
= 1/2(20 kg)(2m/s²)
= 1/2(20)(4)
= 1/2 (80)
KE = 40 J

hope this helps :)

4 0

3 years ago

a 15 kg tv sots on a shelf at a height of 0.3 m. how much gravitational potential energy is added to the television when it is l

nata0808 [166]

Gravitational potential energy can be described as m*g*h (mass times gravity times height).

Originally,
15kg * 9.8m/s^2 *0.3 m = 44.1 kg*m^2/s^2 = 44.1 Joules.

After it is moved to a 1m shelf:
15kg * 9.8m/s * 1 = 147 kg*m^2/s^2= 147 Joules.

To find how much energy was added, we subtract final energy from initial energy:

147 J - 44.1 J = 102.9 Joules.

6 0

3 years ago