B. exothermic
C. isothermic
D. endothermic
E. all of the above
Answer : The correct option is, (D) Endothermic
Explanation :
Adiabatic : It is a process in which a heat is constant. That means no heat is lost or gained by the system.
Isothermic : It is a process in which a temperature is constant.
Exothermic : It is a process in which heat released from system to surrounding. In this process, surrounding temperature increases and system temperature decreases.
Endothermic : It is a process in which heat required from the surrounding. In this process, surrounding temperature decreases and system temperature increases.
When the temperature of water increases from room temperature to 90ºC the process of heating the water is endothermic.
Hence, the correct option is, (D) Endothermic
2) Will the image be erect or inverted?
3) Will the image be enlarged, diminished, or the same size?
4) What kind of mirror is this?
Answer:
1) Image is formed at B
2) The image is an inverted real image
3) The image is a diminished image
4) The mirror is a concave mirror.
Explanation:
According to the diagram, object placed at this point in front of the curved mirror (concave) is placed beyond the center of curvature of the mirror.
To form images by an object placed in front of a curved mirror, ray diagrams are used.
According to the diagram, the first ray from the object incidented on the mirror and parallel to the principal axis converges at the focus (f) after reflection. The second incident ray pass through the focus and then reflect back with reflected ray parallel to the principal axis.
The two reflected ray intersects back at a point B according to the diagram and the image will be formed at that point B with the image head pointing towards the point of intersection.
According to the diagram above, the image will be formed at B and the nature of the image will be inverted, real, diminished (smaller than the object) and formed between the center of curvature and the focus of the mirror.
The mirror in the diagram is a concave mirror since the plane surface of the mirror is bent inwards.
b. It has a fixed volume and shape.
c. It has high energy and expands to fill the container.
d. It has a fixed volume and varied shape.
decreases.
remains the same.
becomes irregular.
b. in the penumbra
c. between the Sun and Earth
d. between the umbra and penumbra
During a total lunar eclipse, the Moon located in the umbra. The answer is letter A. For a total lunar eclipse to occur, the Sun, Earth and Moon must be aligned in a straight line. The Earth’s umbra complete covers the Moon. The earth’s umbra is about 870,000 miles wide.
Answer:
a
Explanation:
Answer:
Time taken, t = 2.37 seconds
Explanation:
It is given that,
Height of an object at time t is given by :
Where
v₀ is initial velocity of object
h₀ is initial height of the object
The feather is dropped from the top of the bridge 90 feet above a river. we have to find the time taken by the feather to reach the water.
At the surface of water, h(t) = 0 and v₀t = 0
So,
t = 2.37 seconds
The feather will take 2.37 seconds to reach the water surface.