i runs along a runway, then
ii plants his pole in the ground. The pole bends and then straightens. As
this happens the vaulter rises into the air and clears a bar, then
iii the vaulter falls back to the ground and lands on a crash mat.
State the major energy transfers and/or conversions that take place at each of
these three stages. (Guideline: up to 300 words in total.)
student of mass m is at a swimming pool. She climbs the steps to
the diving board 4.0 m above the water. She jumps off the board, which
enables her to rise a further 0.7 m before she begins her descent into the
pool. At what speed does she enter the water?
You may assume that the acceleration due to gravity, g, is 9.8 m s−2.
Your answer for this question should be presented under these three
1 Decide how you are going to tackle the problem.
2 Do the calculation.
3 Check that your answer makes sense.
Where appropriate you should summarise the information given in the
question, state any major equations you are going to use in the calculation,
state any assumptions you need to make and give a clear outline of your
plan. Take particular care to show all of your working, include units
throughout the calculation, and demonstrate clearly how the final units are
A student carried out the experiment. Instead of
using scales, the experiment was modified to use a measuring jug to
pour a known volume of water into the kettle . The water and kettle were left in a refrigerator
overnight; the refrigerator was set at the recommended level and so the
water temperature was assumed to be 4 °C. It was assumed that the
temperature of the water at the point at which it boiled vigorously was
100 °C. The student’s amended and partially completed Table is
Complete the results column of Table 6.3 and use the data given in this table
to calculate a value for the specific heat capacity of water. You should
insert the completed table into your assignment document. Your table
should include appropriate units for all the quantities calculated and you
should show your working for the calculation of specific heat capacity, either
in the table or separately. Give your final answer to two significant figures.
b ph = (Equation 1)
where h is the Planck constant , c is the speed
of light and b is a constant called Wien’s displacement constant.
Rearrange this equation to make b the subject and then, by replacing
each term of the equation by its SI base units, express the units of b
in SI base units. Include sufficient working to make it clear how you
arrived at your answer.
Hint – remember that the SI base unit of energy is not joules.
(ii) Combine Equation 1 above with Eph = hf (Book 3, Equation
10.1), and rearrange the resultant to give an equation which has f
as its subject and which does not contain Eph. This equation
gives the relationship between the frequency of light emitted and
the temperature of an object.
(b) In Book 3, Section 8.2 you learnt that the Sun produces its energy by
the conversion of matter into energy in its core and Einstein's theory of
relativity tells us mass is equivalent to energy. Astronomers believe that
the biggest stars in the Galaxy may be a hundred times more massive
than the Sun, but are a million times brighter. Would you expect such
stars to have longer, shorter or comparable lifetimes to that of the Sun?
You should explain your reasoning, based on your understanding of
Book 3 and quantify the relative lifetimes. (Guideline: up to 120 words.)
Note: You do not have to use the equation E = mc2 to answer this
(c) A student carried out the Activity 11.1 experiment, using a
diffraction grating with 307 lines per millimetre (to three significant
figures). Her graph of sin θn against n for the blue spectral line is shown
in Figure 1.
Tutor-marked assignment TMA03
(i) Find the gradient of the graph in Figure 1, using the method
introduced in Box 6.1 of Book 2 and used throughout Book 3.
You do not need to submit an annotated copy of the graph with
your answer but should show all your workings for the
calculation, based on readings from the graph. Give the gradient
to three significant figures.
(ii) Use your answer to (c)(i) to find a value for the wavelength of
the blue light, again showing your working. Give the wavelength
to two significant figures.
(d) The equation for a straight line is often used in science to find an
unknown without reference to a graph. For a set of data for two
quatities, A and B, where A is plotted on the x-axis and B on the y-axis,
the gradient of the straight line is 2.3 × 104 m s−1 and the intercept on
the y-axis is 5.8 × 104 m. Using the equation for a straight line
(Book 3, Equation 7.12 ) as your starting point, determine the value for
A when B = 6.2 × 105 m. Show all your workings and give your answer
in scientific notation and to two significant figures.
I will attach the .pdf with above questions and graphs
please ignore question 5
|Due By (Pacific Time)||01/08/2014 12:00 am|
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