A Block Is Pulled at Constant Speed Along a Rough

question 2

Multiple Choice

A block is pulled at constant speed along a rough level surface by a rope that makes an angle of 30° with respect to the horizontal.The applied force along the rope is .The force of kinetic friction between the block and the surface is 10 N.
-Which one of the following expressions gives the magnitude of the force in SI units?

• A)10/(cos 30°)
• B)10/(sin 30°)
• C)10(cos 30°)
• D)10(sin 30°)
• E)tan 30°

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