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Ksivusya [100]
3 years ago
13

Thermal energy depends on an object’s

Physics
2 answers:
r-ruslan [8.4K]3 years ago
8 0

Answer : Thermal energy depends on the mass, the phase and the temperature of the object.    

Explanation :

Thermal energy is defined as the energy that is produced due to heat flow.

Mathematically, it can be written as :

Q=mc\Delta T

Where

Q is the thermal energy or the heat absorbed/released

c is the specific heat capacity. It varies for solid, liquid and gases.

\Delta T is the change in temperature

It is clear that the thermal energy depends on the object's mass, temperature and also on the phase.

Hence, the correct option is (d).                

oee [108]3 years ago
4 0

The correct answer is D. I alread took this test.

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A 55 kg roller skater is at rest on a flat skating rink, a 198 N horizontal force is needed to set the skater in motion.
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Answer:

Explanation:

To get the person Moving you have to overcome the static (means not moving) friction coefficient.  U(static)

To get the person going at the same speed you have to overcome the kinetic friction coefficient. U(Kinetic)

Force to get him moving is 198 N.   Force = ma = U(static)Mg

combining the 2 equations you get 198N = U(static)* 55kg *9.8m/s^2   Solve for U(static)

Same equation to keep him moving except with the dynamic force and the dynamic U

 

175N=  U(kinetic)*55kg*9.8m/s^2  Solve (U dynamic)

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2 years ago
How are steam powered boats different from sailboats
Alex
Steam powered boats run from an engine, using power, gears, and cranks to function.

Sailboats use no engine and rely on winds to move and change the direction of the boat. 
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3 years ago
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If bullets are fired from an airplane in the forward direction of its motion, the momentum of the airplane will be:_______
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Answer:

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8 0
3 years ago
Es frecuente que en las instalaciones eléctricas domésticas se utilice alambre de cobre de 2.05 mm de diámetro. Determine la res
Tasya [4]

Answer:

The resistance is 0.124 ohm.

Explanation:

It is common for domestic electrical installations to use copper wire with a diameter of 2.05 mm. Determine the resistance of such a wire with a length of 24.0 m.

diameter, d = 2.05 mm

radius, r = 1.025 mm

Length, L = 24 m

resistivity of copper = 1.7 x 10^-8 ohm m

Let the resistance is R.

R =\rho \frac{L}{A}\\\\R = \frac {1.7\times10^{-8}\times 24}{3.14\times1.025\times1.025\times 10^{-6}}\\\\R = 0.124 ohm

7 0
2 years ago
What is the mass, in grams, of a pure iron cube that has a volume of 3.70cm cubed?
Arlecino [84]
To determine the amount in grams of the iron, we need data on the density of iron. From literature, it has a value of <span>p=7.9 g/cm3. We simply multiply the volume to the density. We do as follows:

mass = 3.70 (7.9) = 29.23 g Fe

Hope this answers the question. Have a nice day.</span>
7 0
3 years ago
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