Subject Code : MAS25700
Country : Australia
Assignment Task:

Question 1-Two astronauts are facing off in a fight outside the International space station. Astronaut Pitt (78 kg) and astronaut Reeve (80 kg) are initially at rest with respect to each other. Pitt pushes Reeve hard towards the earth at a speed of 3 m/s. Ignoring friction, 

a) What is the velocity of Pitt after the push?

b) What is the minimum amount of chemical energy that is converted into mechanical energy in Pitt’s muscles from his action? 

 

Question 2- A large container which has 258 g of water initially at 23 °C is placed in a microwave oven. The magnetron in the microwave oven can produce 950 W of EM radiation. The microwave is turned on for 2.5 minutes. 

a) Assuming that all the microwave energy is absorbed by the water, how much water is left in the container? 

b) The OXO 8716900 electric kettle (1500 W) manufacturer’s claim that it can boil up to 1.75 L of water faster than the microwave, safer than the stovetop, and runs off a mains voltage of 120 V. Compare the efficiency of the two approaches. 

c) Name the different ways of heat loss in these systems (Microwave & Kettle) during the heating process. 

 

Question 3-  What is the net electrostatic force on the charge Q3 (-50μC), due to charges Q1 (+68μC) and Q2 (+45μC) with the configuration shown below? 

20200131100424AM-377670717-874995965.png

 

 

Question 4-  Oppositely charged parallel plates are separated by 53.3 mm. A potential difference of 6000 V exists between the plates. 

20200131100424AM-16216219-1127484395.png

a) What is the magnitude of the electric field, E, between the plates; see Figure (A) below? An electron is placed in the middle of the parallel plates; see Figure (B) above. 

b) What is the direction of electric force applied on the electron? 

c) What is the magnitude of the force on the electron? 

d) What is the kinetic energy when the electron moves from rest to reach the plate? 

e) What is the speed of the electron when it hits the plate? 

f) What is the acceleration of the electron? 

g) What is the time interval for this motion? 

 

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  • Posted on : January 31st, 2019
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