A 0.80-kg mass, attached to the end of a 0.75-m string, is whirled around in a c
ID: 1449317 • Letter: A
Question
A 0.80-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path at constant speed of 29 m/s. Find the centripetal force exerted on the mass by the string. A) 370 N B) 450 N C) 900N D) 580N 2. A 1500-kg car rounds an unbanked curve with a radius of 50m at a speed of 10 m/s. What minimum coefficient of friction must exist between the road and tires to prevent the car from slipping? (g = 9.8 m/s^2) A) 0.18 B) 0.20 C) 0.13 D) 0.30 3. A wheel is rotated about a horizontal axle at a constant speed. Next it is rotated in the opposite with the same speed. The acceleration of a point on the outer edge of the wheel in the second case as compared to the acceleration in the first case: A) is in the same direction. B) is in the opposite direction. C) is upward D) is tangential to the wheel. 4. A 10.0-kg block of ice is sliding across a frozen pond at 2.00 m/s. A 7.60-N force is applied in the direction of motion. After the ice block slides 15.0 m, the force is removed. The work done by the applied force is A) -114 J B) +214 J C) -735 J D) +114 J E) +19.7 JExplanation / Answer
1) C) 900N (Force = M x V2 / R)
2) B) 0.2 ( M x V2 / R = µ x M x g )
3) A) ( as the acceleration is only centripetal, the acceleration in both cases is directed towards centre)
4) D) +114 J ( work done = change in KE)
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