salt is the solute in that situation
Answer:
The change in the density of the air inside the syringe is due to the change in temperature. When the air inside the syringe is cooled, it contracts, causing the density to increase.
The principle that explains this phenomenon is known as Charles's Law, which states that the volume of a gas is directly proportional to its temperature, provided the pressure and the amount of gas remain constant.
In this case, the density of the air doubles when the syringe is cooled, implying that the volume of the air inside the syringe is halved. Therefore, if the density of the air when cooled is 2.4 kg/m³, the density of the air at room temperature (when the volume is twice as much) would have been half of this value, or 1.2 kg/m³.
So, the density of the air at room temperature was 1.2 kg/m³.
Answer:
The torque about the origin is 5.0 N.
Explanation:
To calculate the torque (τ) about the origin, you need to know both the force (F) and the position vector (r) from the origin to the point where the force is applied. The formula for torque is:
τ = r × F
Where:
- τ is the torque vector.
- r is the position vector.
- F is the force vector.
In this case, you're given the force vector F = 5.0 y N, where "y" represents the unit vector in the y-direction.
Assuming that the particle is located at a position where the position vector r is given as (x, y), you need to express the position vector in terms of unit vectors. Since the force is applied along the y-axis, you can write the position vector as:
r = x i + y j
Now, you can calculate the torque:
τ = r × F
τ = (x i + y j) × (5.0 y N)
When you take the cross product, the component of the position vector along the direction of the force will contribute to the torque. In this case, only the y-component of the position vector (y j) is along the direction of the force (5.0 y N).
So, the torque about the origin is:
τ = y (5.0 y N)
Now, you can calculate the magnitude of the torque:
|τ| = |y (5.0 y N)| = 5.0 |y|^2 N
The magnitude of the unit vector "y" is 1, so:
|τ| = 5.0 N
The torque about the origin is 5.0 N.
b. precambrian rocks have been changed by heat and pressure
c. precambrian soft-bodied life-forms weren’t often preserved as fossils
d. all of the above
Little is known about much of earth’s early history because Precambrian rocks have been deeply buried they have been changed by heat and pressure ,Precambrian soft-bodied life-forms weren’t often preserved as fossils.
What is Precambrian rocks?
The Precambrian is the earliest part of Earth's history, set before the current Phanerozoic.
Why are Precambrian rocks rare?
Fossils are rare in Precambrian rocks mostly because Precambrian life-forms lacked bones, or other hard parts that commonly form fossils.
Hence, D is correct option
To learn more about Precambrian, here
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The last and longest manned mission to Skylab is a notable point in history of space exploration, but the specific duration is not stated in the provided references.
In regard to the question, "What was the duration of the last and longest manned mission to Skylab?", the Skylab missions were part of a significant chapter in U.S. space exploration history during the 1970s. However, the provided reference material does not offer specific information about the duration of the last and longest manned mission to Skylab. Skylab was an important part of American space research, serving as a space station where numerous scientific experiments were conducted. Yet, without the specific details, it is difficult to provide an accurate response to this particular query. The Skylab program, operated by NASA in the 1970s, had its last and longest manned mission known as Skylab 4. The Skylab 4 mission launched on November 16, 1973, and lasted for a total of 84 days, with the crew returning to Earth on February 8, 1974. The crew consisted of Gerald Carr, Edward Gibson, and William Pogue. This mission set a record for the longest manned spaceflight at that time, spending an extended period aboard the Skylab space station for scientific research and experiments.
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