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Ymorist [56]
3 years ago
15

How much heat is absorbed by a 75g iron skillet when it’s temperature rises from 5c to 20c?

Physics
1 answer:
alexira [117]3 years ago
6 0

Answer: Q=499.5 J  

Explanation:

The heat (thermal energy) absorbed by the iron skillet can be found using the following equation:

Q=m.C.\Delta T   (1)

Where:

Q is the heat  (absorbed)

m=75 g is the mass of the element (iron in this case)

C is the specific heat capacity of the material. In the case of iron is C=0.444\frac{J}{g\°C}

\Delta T=T_{f}-T_{i}=20\°C - 5\°C= 15\°C is the variation in temperature

Knowing this, lets rewrite (1) with these values:

Q=(75 g)(0.444\frac{J}{g\°C})(15\°C)  (2)

Finally:

Q=499.5 J  

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A car is sitting motionless on top of a bridge. The bridge pushes up on the car with a force of 782 Newtons.
Evgesh-ka [11]

Answer: The car would move to the right with 150 n of force. the 150 n of force from friction and air resistance slows the car from moving to the right with 300 n of force.

Explanation:

3 0
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Answer:

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3 0
3 years ago
After enjoying a tasty meal of the first moth, the bat goes after another moth. Flying with the same speed and emitting the same
Aleksandr-060686 [28]

This question is incomplete, the complete question is;

A bat flies towards a moth at 7.1 m/s while the moth is flying towards the bat at 4.4 m/s. The bat emits a sound wave of 51.7 kHz.

After enjoying a tasty meal of the first moth, the bat goes after another moth. Flying with the same speed and emitting the same frequency, this time the bat detects a reflected frequency of 55.5 kHz. How fast is the second moth moving

Answer:

the second moth is moving at 5.062 m/s

Explanation:

Given the data in the question;

Using doppler's effect

f_{moth = f₀( v_{s ± v_{observer / v_{s ± v_{source )

f₁ = f₀( (v_{s + v₂) / ( v_{s - v₁ ) )

frequency reflected from the moth,

Now, moth is the source and the bat is the receiver

f₂ = f₁( (v_{s + v₁ ) / ( v_{s - v₂ ) )

hence, f = f₀[ ( ( v_{s + v₁ ) / ( v_{s - v₂ ) ) ( ( v_{s + u₂ ) / ( v_{s - u₁ ) )

we know that, the velocity of sound v_{s = 343 m/s.

given that v₁ and v₂ { velocity of bat } = 7.1 m/s, f₀ = 51.7 kHz and f = 55.5 kHz.

we substitute

55.5 = 51.7[ ( ( 343 + 7.1 ) / ( 343 - 7.1 ) ) ( ( 343 + u ) / ( 343 - u ) ) ]

55.5 = 51.7[  ( 350.1 / 335.9 ) ( ( 343 + u ) / ( 343 - u ) ) ]

55.5 = 51.7[ 1.04227 ( ( 343 + u ) / ( 343 - u ) ) ]

55.5 = 53.885359 ( ( 343 + u ) / ( 343 - u ) ) ]

55.5 / 53.885359 = ( 343 + u ) / ( 343 - u )

1.02996 =  ( 343 + u₂ ) / ( 343 - u )

( 343 + u₂ ) = 1.02996( 343 - u )

343 + u = 353.27628 - 1.02996u

u + 1.02996u = 353.27628 - 343

2.02996u = 10.27628

u = 10.27628 / 2.02996

u = 5.062 m/s

Therefore, the second moth is moving at 5.062 m/s

4 0
3 years ago
A ball is thrown up into the air. When it falls back down and reaches the
bezimeni [28]

Answer:

A. 3.3 m

Explanation:

Here, we have to use conservation of energy principle.

When the ball is at maximum height, the instantaneous velocity at that point is 0 m/s. So, the kinetic energy of the ball is also 0 at the maximum height. Thus, at maximum height, the energy possessed by the ball is gravitational potential energy only.

Now, when the ball reaches the ground, all the gravitational potential energy changes into kinetic energy because of the conservation of energy.

Therefore, the energy transformation can be given as:

Decrease in potential energy = Increase in Kinetic energy

Decrease in potential energy is given as:

\Delta U=mg(h-0)=mgh

Increase in kinetic energy is given as:

\Delta K=\frac{1}{2}mv^2-0=\frac{1}{2}mv^2

Therefore,

\Delta U=\Delta K\\mgh=\frac{1}{2}mv^2\\h=\frac{v^2}{2g}

Now, plug in 8 for v, 9.8 for g and solve for height h. This gives,

h=\frac{8^2}{2\times 9.8}\\h=\frac{64}{19.6}=3.265\approx 3.3\ m

Therefore, the maximum height reached by the ball is 3.3 m.

4 0
4 years ago
If the angle of incidence is 30°, degrees what is the angle of reflection? ​
algol13

Answer:

Angle of reflection = 30°

Explanation:

One of the laws of reflection is that the angle of incidence is equal to the angle of reflection.

The angle at which the light strikes the mirror is called the angle of incidence while the angle at which the light gets reflected back is called angle of reflection.

In this case, the angle of incidence is 30 degrees. So, we can say that the angle of reflection is also equal to 30 degrees.

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