Question
Asked Feb 13, 2020
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1.The work done by the hand on the block

is positive.
is negative.
is zero.
has a sign which cannot be determined from the given information.
A block is pushed up a frictionless ramp. The
hand pushes parallel to the incline with a
constant force of magnitude F,.The block is
pushed through a vertical distance H. The
block's initial speed (at the bottom of the
ramp) is vo. The ramp has an angle 0.
Н
Ө
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A block is pushed up a frictionless ramp. The hand pushes parallel to the incline with a constant force of magnitude F,.The block is pushed through a vertical distance H. The block's initial speed (at the bottom of the ramp) is vo. The ramp has an angle 0. Н Ө

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Expert Answer

Step 1

Given:

block is moving on an inclined surface.

inclination angle = θ

direction of force = parallel to moving direction.

Step 2

the work done by force on any object is the dot product of force and it's displacement.

Physics homework question answer, step 2, image 1

Step 3

according to formula the work done will be positive when angle between displacement and force is an acute angle.

according to question the displacement of block is,

Physics homework question answer, step 3, image 1

...

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