Answer :First part is what you learned so write what you learned then the other parts is The evidence that the universe is expanding comes with something called the red shift of light. Light travels to Earth from other galaxies. As the light from that galaxy gets closer to Earth, the distance between Earth and the galaxy increases, which causes the wavelength of that light to get longer.
Explanation:
The density decreases and convection causes the hot air particles to rise! BRANLIEST
Answer:
The value of g = 0.6168 m/s².
Explanation:
Given that,
On a planet X,
Length of the pendulum(L) = 0.25 meters,
Time period of the pendulum(T) = 4 seconds.
We have to find the 'g' value on the planet.
The 'g' value on a planet can be found by a pendulum with help of the formula,
T = 2π × 
From this, g = 4π² × 
Using the above formula and substituting the values,we get,
g = 0.6168 m/s².
Answer:
1961 kJ
Explanation:
Since the mass of each substance is 1 kg, the heat required to change a substance at is boiling point is its latent heat of vapourization, L. For a given mass, m, the quantity of heat Q = mL
For liquid water, m = 1 kg and L = 2256 kJ/kg.
So, quantity of heat required is thus Q₁ = 1 kg × 2256 kJ/kg = 2256 kJ
For liquid mercury, m = 1 kg and L = 295 kJ/kg.
So, quantity of heat required is thus Q₂ = 1 kg × 295 kJ/kg = 295 kJ
The amount their thermal energies differ is thus Q₁ - Q₂ = 2256 kJ - 295 kJ = 1961 kJ
Answer:
To go from 20.0 to 30.0 m/s, that is a velocity change of 10.0 m/s.
From the definition of acceleration,
a = (velocity change)/(time required)
In this case you know that a = 5.0 m/s^2, so
time = (10.0 m/s)/(5.0 m/s^2)
= 2.0 seconds
