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4. (a) Which row of the table is correct for both force and velocity? | force | velocity | |--------|----------| | A | scalar | scalar | | B | scalar | vector | | C | vector | scalar | | D | vector | vector | (b) Figure 6 shows a satellite orbiting the Earth - Edexcel - GCSE Physics - Question 4 - 2018 - Paper 1
Question 4
4. (a) Which row of the table is correct for both force and velocity? | force | velocity | |--------|----------| | A | scalar | scalar | | B | scal... show full transcript
Worked Solution & Example Answer:4. (a) Which row of the table is correct for both force and velocity? | force | velocity | |--------|----------| | A | scalar | scalar | | B | scalar | vector | | C | vector | scalar | | D | vector | vector | (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 is D, where both force and velocity are represented as vectors. Force is defined as a vector quantity because it has both magnitude and direction, while velocity is also a vector quantity for the same reasons.
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
The arrow should be drawn from the satellite towards the center of the Earth. This indicates that the gravitational force is pulling the satellite inward, maintaining its orbit.
Step 4
Describe what is meant by red-shift.
Answer
Red-shift refers to the phenomenon where light from an object moving away from an observer is shifted to longer wavelengths, making the light appear redder. This occurs because of the Doppler effect, which affects the wavelength and frequency of light based on the relative motion of the source and the observer.
Step 5
Explain how red-shift provides evidence for the Big Bang theory.
Answer
Red-shift provides evidence for the Big Bang theory by indicating that the universe is expanding. Observations of distant galaxies show that they are moving away from us, and the greater the distance, the faster they are receding, which aligns with the predictions of the Big Bang theory regarding the expansion of the universe.
Step 6
Step 7
State what is meant by 'cosmic background radiation'.
Answer
'Cosmic background radiation' refers to the faint glow of radiation that fills the universe, which is a remnant of the Big Bang. It is uniform and isotropic, and it provides crucial evidence for the hot and dense state of the early universe.
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 by demonstrating that the universe was once in a hot, dense state. The uniformity and specific spectrum of this radiation align with theoretical predictions of the Big Bang, suggesting that it is the residual heat from the initial explosive expansion of space-time.