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Evgen [1.6K]
3 years ago
14

Thermodynamics

Physics
1 answer:
Akimi4 [234]3 years ago
7 0

Answer:

E = 3.8 kJ

Explanation:

Given that,

The mass of the object, m = 10 g = 0.01 kg

The heat of fusion of  aluminum is 380 kJ/kg

We need to find the energy required to melt the mass of the aluminium. It can be calculated as follows:

E = mL

So,

E = 0.01 × 380

E = 3.8 kJ

So, the energy required to melt the mass is equal 3.8 kJ.

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If two monochromatic light waves undergo destructive interference, the amplitude of the resultant wave is
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Answer: The amplitude is 0. (assuming that the amplitude ot both initial waves is the same)

Explanation:

When two monochromatic light waves of the same wavelength and same amplitude undergo destructive interference, means that the peak of one of the waves coincides with the trough of the other, so the waves "cancel" each other in that point in space.

Then if two light waves undergo destructive interference, the amplitude of the resultant wave in that particular point is 0.

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3 years ago
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While Bob is demonstrating the gravitational force on falling objects to his class, he drops an 1.0 lb bag of feathers from the
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As per the question Bob drops the bag full with feathers from the top of the building.

The mass of the bag(m)= 1.0 lb

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Here the acceleration produced on bag due to the free fall will be nothing else except the acceleration due to gravity i.e g =9.8 m/s^2


Here we are asked to calculate the distance travelled by the bag at the instant 1.5 s

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From equation of kinematics we know that -

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For motion under free fall initial velocity (u)=0.

Hence   S= 0×1.5+{0.5×(-9.8)×(1.5)^2}

           ⇒ -S =0-11.025 m

            ⇒ S= 11.025 m

                   =11 m

Here the negative sign is taken only due to the vertical downward motion of the body .we may take is positive depending on our frame of reference .


Hence the correct option is B.

               

3 0
3 years ago
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Match the element to the best description of its ionization energy
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Ionization energy, according to <span>chem.libretexts.org,</span><span> is the quantity of </span>energy<span> that an isolated, gaseous atom in the ground electronic state must absorb to discharge an electron, resulting in a cation. This </span>energy<span> is usually expressed in kJ/mol, or the amount of </span>energy<span> it takes for all the atoms in a mole to lose one electron each.</span>
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You and a friend are jumping on a trampoline. Why does Earth, which is rapidly orbiting around the sun, not move under your feet
Leni [432]
B .Newton's first law holds that your body moves along with Earth because it is not compelled to change its motion by an unbalanced force
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If a car with mass 750 kg is lifted to a height of 2.3 m how much gravitational potential energy is added to the car
Jlenok [28]

I found: 16,905J

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