# Project #20609 - physics

question 1

A pole-vaulter:

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.)

question 2

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.

1 Decide how you are going to tackle the problem.

2 Do the calculation.

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

obtained.

Question 3

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

given below.

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

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.

Question 4

E hcT

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

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?

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

question.

(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

6

(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

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

in scientific notation and to two significant figures.

I will attach the .pdf with above questions and graphs

 Subject Science Due By (Pacific Time) 01/08/2014 12:00 am
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