Answer:
the answer of this question ❓ is no
B. gravity.
C. weight.
D. direction.
B. 2.13 MJ
C. 3.26 MJ
D. 3.09 MJ
Answer;
A. 2.48 MJ
Explanation;
-Heat energy may be given by the product of specific heat capacity , mass and change in temperature, or the product of heat capacity and change in temperature.
-When a substance is changing from solid state to liquid state then the heat energy is calculate by multiplying the latent heat of fusion of a substance by the mass. Latent heat of fusion of ice =3.34×10⁵J/kg and specific heat capacity of water is 2100 J/kg/K.
Specific heat energy: Q = mcΔT
Latent heat energy: Q = mLf
In this case the heat energy required will be;
Heat required to melt ice and raise its temperature to 0°C:
Q₁ = mLf+mciΔT
Q₁ = (7 kg*3.34×10⁵J/kg) + ((7kg*2100J/kgK*{0°C-(9°C)})
= 2.48 MJ (MEGA JOULES)
1. Energy released from changing the phase of a substance from the liquid phase to solid phase can be calculated by using the specific latent heat of fusion. The heat of fusion of water at 0 degrees Celsius is 334 J/g. Calculation are as follows:
Energy = 7000 grams x 334 J/g
Energy = 2338000 J or 2.38 MJ
B. There are no plants to release oxygen.
C. The moon is too far away from Earth.'
D. The moon's gravity is too weak t hold onto gas molecules
The moon does not have an atmosphere hence it has no magnetic field and is too small to have an atmosphere. Another reason why is because the moon has a weak gravitational field. Gravity helps the moon hold on to its atmosphere, the moon is small leaving no atmosphere on the moon.
Your answer is D. The moon almost has no gravity thus it cannot hold onto the gas molecules. The gravity on earth is in fact weak which is also the other reason it cannot hold onto the gas molecules. Your answer is most definitely D, The moon's gravity is too weak to hold onto gas molecules.
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Answer:
At focus.
Explanation:
When the object is placed at the focus of a concave mirror, the image will form at infinity. The formed image is real and inverted and its size is highly enlarged.
When the object is placed between the pole and the focus, the image will formed behind the mirror. The formed image is virtual and erect and its size is enlarged. This is the only case when the formed image is virtual and erect.
b. The object is at rest.
c. The object is going down a hill with a changing speed.
d. The object is speeding up, as it travels back towards the origin.
Answer:
A it is still at the same passe and it is going back down
Explanation:
Answer:
The correct answer to your question is A. The object is moving at a constant, negative, velocity. It is negative because it is moving back towards the origin.
Explanation:
Compound microscope
Corrective eyeglasses
Slide projector