2. Exercises - Revision history

Ian at 16:10, 10 April 2011

Ian — Sun, 10 Apr 2011 16:10:47 GMT

←Older revision		Revision as of 16:10, 10 April 2011
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	{{Not selected tab\|[[2. Introduction to force and gravity\|Theory]]}}		{{Not selected tab\|[[2. Introduction to force and gravity\|Theory]]}}
	{{Selected tab\|[[2. Exercises\|Exercises]]}}		{{Selected tab\|[[2. Exercises\|Exercises]]}}
		+	{{Not selected tab\|[[2. Video\|Video]]}}
	\| style="border-bottom:1px solid #797979" width="100%"\|		\| style="border-bottom:1px solid #797979" width="100%"\|
	\|}		\|}
-

	===Exercise 2.1===		===Exercise 2.1===

Ian at 15:35, 3 February 2011

Ian — Thu, 03 Feb 2011 15:35:16 GMT

←Older revision		Revision as of 15:35, 3 February 2011
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	===Exercise 2.7===		===Exercise 2.7===
	<div class="ovning">		<div class="ovning">
-	The mass of the moon is <math>\text{7}.\text{38}\times \text{1}{{0}^{22}}</math> kg and the radius of the moon is <math>\text{1}.\text{73}\times \text{1}{{0}^{6}}</math> m. Determine the acceleration due to gravity on the moon, by considering the force that the moon exerts on a particle of mass 1 kg on its surface.	+	The mass of the moon is <math>\text{7}\textrm{.}\text{38}\times \text{1}{{0}^{22}}</math> kg and the radius of the moon is <math>\text{1}\textrm{.}\text{73}\times \text{1}{{0}^{6}}</math> m. Determine the acceleration due to gravity on the moon, by considering the force that the moon exerts on a particle of mass 1 kg on its surface.

	</div>{{#NAVCONTENT:Answer\|Answer 2.7\|Solution\|Solution 2.7}}		</div>{{#NAVCONTENT:Answer\|Answer 2.7\|Solution\|Solution 2.7}}
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	===Exercise 2.10===		===Exercise 2.10===
	<div class="ovning">		<div class="ovning">
-	The mass of Mars is <math>\text{6}.\text{42}\times \text{1}{{0}^{23}}</math> kg and the radius of the planet is 3400 km.	+	The mass of Mars is <math>\text{6}\textrm{.}\text{42}\times \text{1}{{0}^{23}}</math> kg and the radius of the planet is 3400 km.
	What is the acceleration due to gravity on Mars?		What is the acceleration due to gravity on Mars?


	</div>{{#NAVCONTENT:Answer\|Answer 2.10\|Solution\|Solution 2.10}}		</div>{{#NAVCONTENT:Answer\|Answer 2.10\|Solution\|Solution 2.10}}

Ian at 20:12, 17 February 2010

Ian — Wed, 17 Feb 2010 20:12:55 GMT

←Older revision		Revision as of 20:12, 17 February 2010
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	c) A lorry of mass 4.2 tonnes.		c) A lorry of mass 4.2 tonnes.
-
-

	</div>{{#NAVCONTENT:Answer\|Answer 2.4\|Solution a\|Solution 2.4a\|Solution b\|Solution 2.4b\|Solution c\|Solution 2.4c}}		</div>{{#NAVCONTENT:Answer\|Answer 2.4\|Solution a\|Solution 2.4a\|Solution b\|Solution 2.4b\|Solution c\|Solution 2.4c}}
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	===Exercise 2.5===		===Exercise 2.5===
	<div class="ovning">		<div class="ovning">
-	~~An aeroplane circles an airport at~~ a ~~constant speed~~. ~~Are~~ the ~~forces acting on~~ the ~~aeroplane in equilibrium? Explain your answer~~.	+
		+	The weight of a body is 441 N. Calculate the mass of the body.

	</div>{{#NAVCONTENT:Answer\|Answer 2.5\|Solution\|Solution 2.5}}		</div>{{#NAVCONTENT:Answer\|Answer 2.5\|Solution\|Solution 2.5}}

Ian at 09:56, 6 September 2009

Ian — Sun, 06 Sep 2009 09:56:53 GMT

←Older revision		Revision as of 09:56, 6 September 2009
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	</div>{{#NAVCONTENT:Answer\|Answer 2.5\|Solution\|Solution 2.5}}		</div>{{#NAVCONTENT:Answer\|Answer 2.5\|Solution\|Solution 2.5}}
		+
		+
		+	===Exercise 2.6===
		+	<div class="ovning">
		+	A satellite, of mass 300 kg, orbits the earth at a height of 7000 km above the surface of the earth. Calculate the magnitude of the gravitational attraction that acts on the satellite.
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.6\|Solution\|Solution 2.6}}
		+
		+
		+	===Exercise 2.7===
		+	<div class="ovning">
		+	The mass of the moon is <math>\text{7}.\text{38}\times \text{1}{{0}^{22}}</math> kg and the radius of the moon is <math>\text{1}.\text{73}\times \text{1}{{0}^{6}}</math> m. Determine the acceleration due to gravity on the moon, by considering the force that the moon exerts on a particle of mass 1 kg on its surface.
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.7\|Solution\|Solution 2.7}}
		+
		+
		+	===Exercise 2.8===
		+	<div class="ovning">
		+
		+	A planet has a mass of
		+	<math>\text{5}\times \text{1}{{0}^{20}}</math>
		+	kg and on this planet the acceleration due to gravity is 3.2 ms-1. Determine the radius of the planet.
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.8\|Solution\|Solution 2.8}}
		+
		+
		+	===Exercise 2.9===
		+	<div class="ovning">
		+	A man, of mass 80 kg, climbs 5000 m to the top of a mountain.
		+
		+	a) Use the Universal Law of Gravitation to calculate the gravitational attraction on the man.
		+
		+	b) Compare your answer to part (a) with the result given by using ''mg''.
		+
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.9\|Solution a\|Solution 2.9a\|Solution b\|Solution 2.9b}}
		+
		+
		+	===Exercise 2.10===
		+	<div class="ovning">
		+	The mass of Mars is <math>\text{6}.\text{42}\times \text{1}{{0}^{23}}</math> kg and the radius of the planet is 3400 km.
		+	What is the acceleration due to gravity on Mars?
		+
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.10\|Solution\|Solution 2.10}}

Ian at 09:27, 6 September 2009

Ian — Sun, 06 Sep 2009 09:27:46 GMT

←Older revision		Revision as of 09:27, 6 September 2009
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	</div>{{#NAVCONTENT:Answer\|Answer 2.4\|Solution a\|Solution 2.4a\|Solution b\|Solution 2.4b\|Solution c\|Solution 2.4c}}		</div>{{#NAVCONTENT:Answer\|Answer 2.4\|Solution a\|Solution 2.4a\|Solution b\|Solution 2.4b\|Solution c\|Solution 2.4c}}
		+
		+
		+
		+	===Exercise 2.5===
		+	<div class="ovning">
		+	An aeroplane circles an airport at a constant speed. Are the forces acting on the aeroplane in equilibrium? Explain your answer.
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.5\|Solution\|Solution 2.5}}

Ian at 09:23, 6 September 2009

Ian — Sun, 06 Sep 2009 09:23:56 GMT

←Older revision		Revision as of 09:23, 6 September 2009
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	</div>{{#NAVCONTENT:Answer\|Answer 2.3\|Solution a\|Solution 2.3a\|Solution b\|Solution 2.3b}}		</div>{{#NAVCONTENT:Answer\|Answer 2.3\|Solution a\|Solution 2.3a\|Solution b\|Solution 2.3b}}
		+
		+
		+
		+	===Exercise 2.4===
		+	<div class="ovning">
		+	Calculate the magnitude of the force that gravity exerts on each of the following objects.
		+
		+	a) A car of mass 1250 kg.
		+
		+	b) A table tennis ball of mass 4 grams.
		+
		+	c) A lorry of mass 4.2 tonnes.
		+
		+
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.4\|Solution a\|Solution 2.4a\|Solution b\|Solution 2.4b\|Solution c\|Solution 2.4c}}

Ian at 09:18, 6 September 2009

Ian — Sun, 06 Sep 2009 09:18:02 GMT

←Older revision		Revision as of 09:18, 6 September 2009
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	b) Calculate the magnitude of each of these forces.		b) Calculate the magnitude of each of these forces.
-	\|}	+
	</div>{{#NAVCONTENT:Answer\|Answer 2.1\|Solution a\|Solution 2.1a\|Solution b\|Solution 2.1b}}		</div>{{#NAVCONTENT:Answer\|Answer 2.1\|Solution a\|Solution 2.1a\|Solution b\|Solution 2.1b}}

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	</div>{{#NAVCONTENT:Answer\|Answer 2.2\|Solution\|Solution 2.2}}		</div>{{#NAVCONTENT:Answer\|Answer 2.2\|Solution\|Solution 2.2}}
		+
		+
		+	===Exercise 2.3===
		+	<div class="ovning">
		+	A helicopter, of mass 800 kg, is rising at a constant rate.
		+
		+	a) Are the forces acting on the helicopter in equilibrium?
		+
		+	b) Calculate the magnitude of the vertical lift force on the helicopter.
		+
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.3\|Solution a\|Solution 2.3a\|Solution b\|Solution 2.3b}}

Ian at 09:09, 6 September 2009

Ian — Sun, 06 Sep 2009 09:09:12 GMT

←Older revision		Revision as of 09:09, 6 September 2009
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	\|}		\|}
	</div>{{#NAVCONTENT:Answer\|Answer 2.1\|Solution a\|Solution 2.1a\|Solution b\|Solution 2.1b}}		</div>{{#NAVCONTENT:Answer\|Answer 2.1\|Solution a\|Solution 2.1a\|Solution b\|Solution 2.1b}}
		+
		+	===Exercise 2.2===
		+	<div class="ovning">
		+	An aeroplane circles an airport at a constant speed. Are the forces acting on the aeroplane in equilibrium? Explain your answer.
		+
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.2\|Solution\|Solution 2.2}}

Ian at 10:39, 19 May 2009

Ian — Tue, 19 May 2009 10:39:11 GMT

←Older revision		Revision as of 10:39, 19 May 2009
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-	===Exercise 3.1:1===	+	===Exercise 2.1===
	<div class="ovning">		<div class="ovning">
	A man, of mass 75 kg, stands on a horizontal surface. Assume that the man has two points of contact with the ground.		A man, of mass 75 kg, stands on a horizontal surface. Assume that the man has two points of contact with the ground.

Ian at 14:16, 11 May 2009

Ian — Mon, 11 May 2009 14:16:46 GMT

←Older revision		Revision as of 14:16, 11 May 2009
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	\| style="border-bottom:1px solid #797979" width="100%"\|		\| style="border-bottom:1px solid #797979" width="100%"\|
	\|}		\|}
		+
		+
		+	===Exercise 3.1:1===
		+	<div class="ovning">
		+	A man, of mass 75 kg, stands on a horizontal surface. Assume that the man has two points of contact with the ground.
		+
		+	a) Draw a diagram to show the forces acting on the man.
		+
		+	b) Calculate the magnitude of each of these forces.
		+	\|}
		+	</div>{{#NAVCONTENT:Answer\|Answer 2.1\|Solution a\|Solution 2.1a\|Solution b\|Solution 2.1b}}