Answer: representative sample
Explanation:
A representative sample can be defined as a subset of the population. This sample includes subgroups that reflect the features of the larger group and are chosen for a specific purpose of study. For example, a classroom with 60 students having 30 females and 30 males, can generate a representative sample based on the gender differences.
For this problem, we combine the concepts learned in physics and in calculus. The velocity, by definition, is the total distance travelled per time elapsed. It can also be expressed in Δx/Δt, This is also a definition in calculus where dx/dt is equal to velocity. Therefore, to solve the velocity, differentiate the equation in terms of t.
x = 2 cos(10t)
dx/dt = 2*(-sin(10t))*(10)
dx/dt = -20sin (10t)
We are asked to find the velocity at 0.40 seconds. Thus, we substitute t = 0.40 to the equation
dx/dt = -20sin(10*0.4)
dx/dt = v = -1.395 m/s
Therefore, the velocity at t=0.04 seconds is -1.395 m/s. The negative sign connotes that the direction of the motion is south or to the left based on the sign convention.
Answer:
The molecule of gases are separated at far distance from each other in space causing the objects to move freely resulting in the increase in kinetic energy of the molecules.
Explanation:
There are 3 states of matters namely; solid, liquid and gaseous state.
For gases, the molecules are held father apart as such they possesses weak intermolecular force due to the large distance between their molecules. Due to the free nature of this molecules, they are free to move about in space leading to the increase in their kinetic energy. This molecules also tends to collide with one another and the walls of their container causing an increase in their kinetic energy and causing them to move faster in space.
Answer:
The average densities of both matches the expected density for objects made from water ice.
Explanation:
Charon's density is 1.2 to 1.3 g / cm3, while Pluto's density is 1.8 to 2.1 g / cm3. This was discovered in many researches and measurements of these two celestial bodies, with the objective of understanding them and promoting efficient scientific knowledge.
With the measurements of the average densities between pluto and Charon it was possible to conclude several statements about them. Firstly, it is possible to see that the two formed independently and at different times, in addition to indicating the existence of few rocks in charon, which is consistent with the average density of objects made mostly of water ice.