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kotykmax [81]
3 years ago
15

According to the second law of thermodynamics, which is a requirement for thermal energy to flow from colder objects to hotter o

bjects?
A. Work must be done on the system.

B. Thermal expansion must occur in the system.

C. Radiation must alter the system.

D. Convection must occur within the system.
Physics
2 answers:
yKpoI14uk [10]3 years ago
8 0

Answer:A. Work must be done on the system.

Explanation:

maxonik [38]3 years ago
4 0

Answer: work must be done on the system  (Option A)

Explanation:

The second law of thermodynamics is the fundamental law of nature; it states that energy can be transferred from cold objects to hot objects only, if work is done on the system. If energy is added to the system then as a result the thermal energy would increase. Second law of thermodynamics is used to determine whether a process is spontaneous or not.  Moreover,the second law of thermodynamics is also used in refrigerators.

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A 20-gram bullet traveling at 250 m/s strikes a block of wood that weighs 2 kg. With what velocity will the block and bullet mov
Shkiper50 [21]

Answer:

the velocity of the bullet-wood system after the collision is 2.48 m/s

Explanation:

Given;

mass of the bullet, m₀ = 20 g = 0.02 kg

velocity of the bullet, v₀ = 250 m/s

mass of the wood, m₁ = 2 kg

velocity of the wood, v₁ = 0

Let the velocity of the bullet-wood system after collision = v

Apply the principle of conservation of linear momentum to calculate the final velocity of the system;

Initial momentum = final momentum

m₀v₀ + m₁v₁ = v(m₀ + m₁)

0.02 x 250  + 2 x 0    =    v(2  + 0.02)

5 + 0 = v(2.02)

5 = 2.02v

v = 5/2.02

v = 2.48 m/s

Therefore, the velocity of the bullet-wood system after the collision is 2.48 m/s

6 0
3 years ago
Which two fields of study do the principles of biomechanics come from? A. science and technology B. physics and engineering C. b
kati45 [8]

Answer:

B. physics and engineering

Explanation:

Biomechanics is the study of mechanical laws and living organisms. Hence, it comprises of the interrelationships between physics and engineering.

8 0
3 years ago
A copper sphere 10 mm in diameter is dropped into a 1-m-deep drum of asphalt. The asphalt has a density of 1150 kg/m3 and a visc
kvasek [131]

Answer:

t = 1964636.542 sec

Explanation:

Given data:

sphere diameter is 10 mm

Density is 1150 kg/m^3

viscosity 105 N s/m^2

We knwo that time taken by sphere can be calculated by following procedure

\tau = \mu \frac{du}{dy}

\frac{F}{A} =  \mu \frac{du}{r}

\frac{\rho_C -\rho_{asphalt} gv}{2 \pi rL} = 10^5 \frac{du}{r}

Solving for du

du = \frac{ (8933 - 1150) 9.81 \frac{4}{3} \pi (10\times 10^{-3})^3}{2\pi \times 1\times 10^5}

du = u = 5.09\times 10^{-7}

u = \frac{1}{t}

t = \frac{1}{5.09\times 10^{-7}} = 1964636.542 sec

6 0
4 years ago
I'll mark brainliest if you help me. :)
BaLLatris [955]

Answer:

gravitational potantional energy

Explanation:

ill try to link a source!

edit: https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/14.3/primary/lesson/potential-energy-ms-ps#:~:text=Potential%20energy%20due%20to%20the,is%20called%20gravitational%20potential%20energy.

3 0
3 years ago
Technician A says a refrigerant identifier is only needed when the technician is unsure of the refrigerant used in an AC system.
Yanka [14]

Question:

The options are;

A) Technician A only B) Technician B only

C) Both technicians A and B D) Neither technician A nor B

Answer:

The correct option is;

D) Neither technician A nor B

Explanation:

To avoid costly errors, it is important to make use of a refrigerant identifier both on a vehicle A/C system requires work and at the market before buying a refrigerant.

There are refrigerant identifiers that can detect air contamination the however a refrigerant identifier is meant to identify the refrigerant present in the system based on purity and quality and can give an indication of the type of contamination present. All contaminated refrigerants are disposed of.

8 0
3 years ago
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