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Q7) The coefficient of kinetic friction between the ground and a sled is 0.25. If the sled's mass is 8.0 kg. how much force is required to move the sled at a constant velocity? a) 2.0 N b) 20 N c) 320 N d) 32 N

Q7) The coefficient of kinetic friction between the ground and a sled is 0.25. If the sled's mass is 8.0 kg. how much force is required to move the sled at a constant velocity? a) 2.0 N b) 20 N c) 320 N d) 32 N

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Q7) The coefficient of kinetic friction between the ground and a sled is 0.25. If the sled's mass is 8.0 kg. how much force is required to move the sled at a constant velocity? a) 2.0 N b) 20 N Q8) Constant force F-(i+4k) N acts on 2 kg object moved it displacement r-(2i+3j-4k) m Work done by the force on object is: a) 11 J b)-11 J c)-14 J d) 14 J e) rero Q9) Person of 80 kg lifting himself by thread (de) 8m upward in 10 second. the average power In watt is: a) 640 b) 64 c) 6400 d) 6.4 e) none Q10) An object with initial speed of 6 m/s slides a distance of 9 m before coming to rest on a rough horizontal surface. The kinetic coefficient friction is: a) 0.12 b) 0.2 c) 123.2 d) 0.73 e) 0.49 Q11) A boy of mass 40 Kg skies down a 20 m high hill if the friction force is not negligible and the speed in the bottom is 10m/sec, how much work is done by frictional force: a)-102203 b)-7300J c)-8760J c) 320 N d) 3.5 Q12) Amass of 35 kg is acted on by two forces: force F, is 30 N to cast and force F; is 24 N to the magnitude of the acceleration in (m/s) is: a) 1.1 b) 4.1 c) 2.7 Q13) If a 3.0 mm, b-4.0 mm, 21-60 nC, 22-80 nC, and q-30 nC in the figure, the magnitude of the total electric force on q? a) 1.AN b) IN c) 1.7 N d) 2 N e) 0.5 N b) 4x 10" d)-5840 e) 2 x 10" e) 0,8 20- d) 32 N Q14) An object is determined to have a negative charge of 48 nC. The object has an excess of electrons equal: a) 3 × 10¹¹ d) 5 x 10¹ north.
Transcribed Image Text:Q7) The coefficient of kinetic friction between the ground and a sled is 0.25. If the sled's mass is 8.0 kg. how much force is required to move the sled at a constant velocity? a) 2.0 N b) 20 N Q8) Constant force F-(i+4k) N acts on 2 kg object moved it displacement r-(2i+3j-4k) m Work done by the force on object is: a) 11 J b)-11 J c)-14 J d) 14 J e) rero Q9) Person of 80 kg lifting himself by thread (de) 8m upward in 10 second. the average power In watt is: a) 640 b) 64 c) 6400 d) 6.4 e) none Q10) An object with initial speed of 6 m/s slides a distance of 9 m before coming to rest on a rough horizontal surface. The kinetic coefficient friction is: a) 0.12 b) 0.2 c) 123.2 d) 0.73 e) 0.49 Q11) A boy of mass 40 Kg skies down a 20 m high hill if the friction force is not negligible and the speed in the bottom is 10m/sec, how much work is done by frictional force: a)-102203 b)-7300J c)-8760J c) 320 N d) 3.5 Q12) Amass of 35 kg is acted on by two forces: force F, is 30 N to cast and force F; is 24 N to the magnitude of the acceleration in (m/s) is: a) 1.1 b) 4.1 c) 2.7 Q13) If a 3.0 mm, b-4.0 mm, 21-60 nC, 22-80 nC, and q-30 nC in the figure, the magnitude of the total electric force on q? a) 1.AN b) IN c) 1.7 N d) 2 N e) 0.5 N b) 4x 10" d)-5840 e) 2 x 10" e) 0,8 20- d) 32 N Q14) An object is determined to have a negative charge of 48 nC. The object has an excess of electrons equal: a) 3 × 10¹¹ d) 5 x 10¹ north.
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