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Which row of the table is correct for both force and velocity? (a) (b) Figure 6 shows a satellite orbiting the Earth - Edexcel - GCSE Physics - Question 4 - 2018 - Paper 1
Question 4
Which row of the table is correct for both force and velocity? (a) (b) Figure 6 shows a satellite orbiting the Earth. (i) State the name of the force ... show full transcript
Worked Solution & Example Answer:Which row of the table is correct for both force and velocity? (a) (b) Figure 6 shows a satellite orbiting the Earth - Edexcel - GCSE Physics - Question 4 - 2018 - Paper 1
Step 1
Which row of the table is correct for both force and velocity?
Answer
The correct row for both force and velocity is option D: both are vector quantities. This is because force, representing an interaction that causes a change in motion, and velocity, representing the rate of change of position, are both defined by magnitude and direction.
Step 2
Step 3
Draw an arrow on Figure 6 to show the direction of the force acting on the satellite, that keeps the satellite in orbit around the Earth.
Answer
An arrow should be drawn from the satellite towards the center of the Earth, indicating the direction of the gravitational force acting on the satellite.
Step 4
Describe what is meant by red-shift.
Answer
Red-shift refers to the phenomenon where light from an object is increased in wavelength, shifting it towards the red end of the spectrum. This typically occurs when the object is moving away from the observer, leading to a decrease in frequency of the emitted light.
Step 5
Explain how red-shift provides evidence for the Big Bang theory.
Answer
Red-shift provides evidence for the Big Bang theory by demonstrating that distant galaxies are moving away from us, which implies the universe is expanding. The observation of this red-shift supports the idea that the universe began from a singularity and has been expanding ever since.
Step 6
Step 7
Step 8
Explain how the presence of CMB radiation provides evidence for the Big Bang theory.
Answer
The presence of CMB radiation supports the Big Bang theory as it is a remnant of the hot early universe, uniformly detected in all directions. Its existence and the observed properties (such as temperature and spectrum) are consistent with predictions based on the Big Bang model.