Using the set-up seen here, Ms. Garcia places a golf ball between the globe and the flashlight. Turning off the lights in the ro
om, she shines a flashlight from behind the golf ball. The students observe the shadow of the golf ball falling on the globe. What is this setup trying to model?
A) a solar eclipse
B) the solar system
C) the idea of gravity
D) the surface of the moon
A) a solar eclipse
B) the solar system
C) the idea of gravity
D) the surface of the moon
1 answer:
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(a) v=HR defines the Hubble constant. According to R=vt, the gap R between any two far-separated objects opens at a constant speed. The time interval t since the Big Bang is then calculated.
v=HvΔt→Δt=
<h3>What exactly is the Hubble constant?</h3>
- Hubble constant, in cosmology, a proportionality constant in the relationship between the velocities of distant galaxies and their distances.
- It expresses the rate of expansion of the universe. It is represented by the symbol
, with the subscript indicating that the value is measured at the present time, and is named after Edwin Hubble, an American astronomer who attempted to measure its value in 1929.
- Hubble established the cosmological velocity-distance law using redshifts of distant galaxies measured by Vesto Slipher, also of the United States, and his own distance estimates for these galaxies:
To learn more about Hubble constant refer to
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Answer:
Mass of the car is 1576 kg.
Explanation:
Let the mass of the car be kg.
Given:
Initial velocity of the car is,
As the car stops, final velocity of the car is,
Change in momentum is,
Now, we know that, momentum is given as the product of mass and velocity.
So, change in momentum is given as:
Therefore, the mass of the car is 1576 kg.