Section A(ShortAnswers)[10]➢
For each question below,o state what equation you are using for the first mark an do show how the data is inserted into the equation along with the final answer for the second mark
.A1.Two forces of 8 N and 15 N act at right angles to each other. Calculate the magnitude of the resultant force.[2]
A2.A body with a 5.0 kg mass is dropped from the top of a 20m tower to the ground.How much gravitational potential energy does it have just before it is dropped?[2]
A3. A 2.0 V cell is used with a potentio meter to find the emf of an unknown battery. With the 2.0 V cell in place the wire has a length of 136 mm and with the unknown battery in place the length changes to 612 mm. What is the emf of the unknown battery? [2]
A4. What is the wavelength of BBC Radio 2 which broadcasts at a frequency of88.1MHz?[2]A5.A small object is placed a distance of 15 cm to the left of a convex converging lens and produces an image that is 30 cm to the right of the lens. Calculate the focal length ofthe lens.[2]
Section B(LongAnswers)[40]QuestionB1[10]A space orbiter of mass 2.0 × 104kg is travelling at 1500 ms−1.
The engines eject hot exhaust gases at a speed of 1200 ms−1relative to the orbiter. In order to get onto the correct trajectory to dock with a satellite the orbiter fires its engines and carries out a 5.0 s burn.
During this burn the orbiter increases its velocity by 3.0ms−1.
(a)State the “principle of conservation of linear momentum” including the condition required for it tobeapplied.
[2](b)Assuming the mass of fuel ejected is negligible compared to the mass of the orbiter, what is,
(i)the acceleration of theorbiter,
(ii)the distancetravelled
(iii)and the force produced by the engines duringtheburn?
[3](c)Determine the mass of gas ejected by the rocketduring the burn, state whether you agree with the assumption that this is negligible compared to the mass oftheorbiter.[5]QuestionB2[10](a)A convex lens has a focal length of 25.0 cm. An object is placed at a distance of 35.0 cm from thislens.
(i)Calculate the image distance for thisarrangement.
(ii)What is the magnification oftheimage?
[4](b)The image is required to be magnified by 5times.
(i)At what distance would the object have to be placed from the lens to achieve this?
(ii)What is the new image distance?
(iii)Hence or otherwise, what is the total distance from the object totheimage?[6]
QuestionB3[10](a)Figure QB3 shows a network of resistors, calculate the value of the circuit’s resistance.[5]ZFigure QB3(b)If the battery has an emf = 6.0 V and negligible internal resistance, what is the reading ontheammeter?[5]QuestionB4[10](a)State the two conditions required for the movement of a body to be considered simple harmonic motion (SHM) and explain how each condition is represented by the equation,𝑎𝑎=−𝜔𝜔2𝑥𝑥.[2](b)A body of mass 0.45 kg is moving with simple harmonic motion. It has an amplitude of 6.0 cm and its frequency is 0.40 Hz.
Determine,
(i)the maximum velocity of the body, explaining the steps taken to produce an equation for maximumvelocity,
(ii)the maximum acceleration of the body, explaining how you modified the equation to account for maximumacceleration
(iii)the total energy of the system, stating which equation you have used and how you modified it to find thetotalenergy.[8]R1 = 45R2 = 55XYR4 =30R3 = 25