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Choose the correct option.

We’ve signed a _______ with neighbouring states to limit emissions of harmful gases.

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Question 4

A small satellite was launched

straight up from the surface of the earth into orbit at very high speed. If the

satellite has a speed of 500 m/s at a height of 400 km (height is relative to

the surface), what was the launch speed of the satellite?

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Ignore air resistance. The mass

and radius of earth is

5.98 x 1024 kg and 6.37 x 106 m

,

respectively.

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Question 3

Pluto moves in an elliptical

orbit around the sun. Pluto’s speed is 6.12 km/s where it is closest to the sun,

at a distance of 4.43 x 10

9

km. Calculate Pluto’s speed where it is

furthest from the sun, at a distance of 7.3 x 10

9 km?

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Question 2 (cont.)

(c)   

If the linear speed of the planet at point B is 2000

m/s, calculate its angular speed.

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Question 2 (cont.)

(b)   

What is the angle between the position and

linear velocity vectors of the planet at point B?

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Question 2

A planet of mass m moves clockwise

around a star of mass M in an elliptical orbit.

Image failed to load

(a)   

What is the angle between the position and

linear velocity vectors of the planet at point A?

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Question 1

A planet of mass m moves

clockwise around a star of mass M in an elliptical orbit with semimajor axis

a

. The total mechanical energy of the

planet is 

.

At what distance is the planet from the star where the kinetic energy of the

planet is 

 

.

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The sequence below represents the coding DNA strand of the start of a gene, including part of the 5' untranslated region.

(5')...ACCGAAGGAGGTCGCAGCAATGAAACGATTTCGGCACA...(3')

In studying disease variants, a nucleotide mutation of T→C was detected in the third base of the fourth codon. What effect would this mutation have? 

(When considering your answer, assume standard initiation of translation is numbered as codon 1.)

Image failed to load: Codons AAs and names

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Using your knowledge of the genetic code and the image below, which ONE of the following amino acid replacements can be caused by a single nucleotide change?

Image failed to load: Codons

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Consider the following tripeptide:

Asn-Ile-Tyr

In the box below, enter a minimal DNA sequence (coding strand), written 5'-to-3', that could give rise to this peptide. Do not include an initiating codon at the start. Please just enter in the codons for the given peptide above.

(You should only include nucleotides in your answer, e.g. AAAA... Do not include 5' or 3', spaces, or any other non-nucleotide characters.)

Image failed to load: Codons

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