Response:
a) , b)
Clarification:
a) The absolute pressure at a depth of 27.5 meters is:
b) The force applied by the water is:
A force of only 150 N can lift a 600 N sack of flour to a height of 0.50 m when using a lever as shown in the diagram below. a.
Find the work done on the sack of flour (in J). b. Find the distance you must push with the 150 N force-on the left side (in m). c. Briefly explain the benefit of using a lever to lift a heavy object.
1 answer:
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Response:
A)
B)
C)
Clarification:
The question is not fully provided. The complete question was:
A skateboarder with a mass of ms = 54 kg is at the top of a ramp with a height of hy = 3.3 m. He then jumps on his skateboard and goes down the ramp. His speed at the base is vf = 6.2 m/s.
Part (a) Formulate an expression for the work, Wf, done by the frictional force on the skateboarder in terms of the variables listed in the problem.
Part (b) The ramp is at an angle θ with the ground, where θ = 30°. Formulate an expression for the frictional force's magnitude, fr, between the skateboarder and the ramp.
Part (c) Upon reaching the bottom, the skateboarder continues with speed vf onto a grass-covered flat surface. The friction between the grass and the skateboarder brings him to a halt after 5.00 m. Determine the frictional force, Fgrass in newtons, between the skateboarder and the grass.
For part A), we assess the energy balance to determine the work done by the friction:
For part B), we utilize the previously calculated work:
Rearranging for friction force:
For part C), we first ascertain the acceleration through kinematic equations and subsequently find the frictional force using dynamic methods:
Rearranging for 'a':
Now, using dynamics: