Physics

1. A ball is launched from a cliff with an initial velcity of 10 m/s at an angle of 40 degrees above horizontal. If the ball lands 24 m away, determine the height of the cliff.

2. if the mass A is 1 kg and the mass of B is 6.0 kg, determine the acceleration of the system and the tension of the string if the coefficient of friction between A and the table is 0.8. (pulley problem)

I got 25 m/s for this answer

3. An 1000 kg Indy car is travelling around a curve with a radius of 80 m. If the curve is banked at 30 degrees and the coefficient of friction is 0.8, what is the maximum speed at which the car can travel without flying off?

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1. 1. Vo = 10m/s[40o]
Xo = 10*cos40 = 7.66 m/s.
Yo = 10*sin40 = 6.43 m/s.

Range = Xo*T = 24 m.

7.66 * T = 24
T = 3.13 s. = Fall time.

h = Yo*T + 0.5g*T^2
h = 6.43*3.13 + 4.9*3.13^2 = 68.1 m.

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posted by Henry

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