28. What type of force occurs when the breaks are applied on a bike? a. Stretchi

Question

28. What type of force occurs when the breaks are applied on a bike? a. Stretching b. Elastic CFriction d. Magnetic 29. Unless acted on by an outside force, an object moving with uniform velocity a. b. c. Gradually comes to rest. Falls to the Earth. Has no momentum. d. Abruptly comes to rest. Continues to move at that velocity. e. 30. A net force of 10N acts on a 0.2kg ball. What is the acceleration of the ball? a. Om/s b. 0.02m/s C. 2 m/s d. 5 m/s e. 50 m/s 31. A 25-N steel ball is suspended by a light rope from the ceiling and the system is not moving. The tension in the rope is a. 25 N d. Can't decide without acceleration information. b. 25g N c. Zero A 2kg block is lifted vertically 0.5m by a construction worker. How much work was done by the construction worker? a. 1J b. 10J c. 0.1J d. zero 33. A certain motor is able to perform 6000J of work over the course of 2 minutes. What power is developed by the motor during this time? 3000J 12000W b. 3000W 50 W 0

Explanation / Answer

28) Option c is correct

29) Option e is correct according to newtons first law of motion

30) F= ma

a= F/m = 10/0.2 = 50 m/s2 Option e is correct

31) Option a is correct

32) W= Force*displacement

W= mg*d = 2*10*0.5 = 10 J

Option b is correct

33) power is work done per unit time

P= w/t

P=6000/(2*60)

P=50 W

Option a is correct

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