Answer:
They appear to recede from our viewpoint.
That is, their emitted spectra are shifted toward the red (red-shift).
The wave-lengths that are received on earth are somewhat longer because of the "Doppler" shift of the receding atoms.
The initial velocity of the car is 11 m/s.
Explanation:
- Here, we can use the equations of motions.
- The first of equation of motion is v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.
- The given parameters are,
Final velocity, v = 20 m/s
acceleration of the care, a = 2 m/
time, t = 3 s
Initial velocity, u = ?
- Hence, the equation can be written as u = v - at
once you substitute all these vales, you will get u = 11 m/s
Volume of the moon rock is 178.51 cm³
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Explanation:</h3>
Given:
Density of the moon rock = 2.7 g/cm³
Mass of the moon rock = 482 g
To find the volume of the moon rock = ?
The relationship between Density, Mass and Volume is given by
Volume of the moon rock will be 178.51 cm³
silicone rubber is used to make a cast of a tool mark.