Basic Phyics

Basic Phyics - Question 1 An object is launched...

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Question 1 An object is launched horizontally from the top of an inclined plane (Figure 1). The plane makes an angle of 40 ° with the horizontal. The launch speed is 5 m/s. Calculate how far down the incline the object ‘lands’. Ignore all forces except gravity. Question 2 A small 2 kg mass rotates in a horizontal circular path around a central rod, which is attached by two massless strings. Both strings are 1.5 m long and both make an angle of ξ = 30 ° to the rod. (a) Draw a free body diagram showing all forces acting on the mass (b) Given that the tension in the upper string is 70 N, what is the tension in the lower string? (c) What is the linear velocity of the mass?
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Question 3 (a) Calculate the magnitude of the ‘free-fall’ acceleration at an altitude of 1000 km above the Earths surface. (Earths mass = 5.98 x 10 24 and its mean radius = 6370 km). (b) A half-brick is fired directly upwards from the surface of the Earth at 8 km.s -1 . How high above the Earths surface will it travel before returning to Earth? Neglect air
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This note was uploaded on 09/06/2010 for the course BSC PHY1417 taught by Professor Prof during the Spring '08 term at HKU.

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Basic Phyics - Question 1 An object is launched...

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