What does mechanical advantage describe regarding simple machines?
2 answers:
Answer:
They multiply the input force.
Explanation:
Mechanical Advantage is the multiplication of the input force to give an increased output by a <em>simple machine </em>due to the difference in the length of load arm and the effort arm.
It is based upon the law of conservation of moments as to force applied at the farther point from a hinge or a pivot needs to be balanced by a greater force counteracting at a shorter distance from the pivot.
<u>Lever is a simple machine which consists of a bar pivoted or supported at a point (called fulcrum) about which it can rotate.</u>
..............................................(1)
where:
force applied on the end of effort arm
force due to load on the end of load arm
L = length of load arm
E = length of effort arm
Equation (1) is known as the law of levers, it was proven by <em>Archimedes </em>using geometric reasoning.
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Answer:
a)3.5s
b)28.57m/S
c)34.33m/S
d)44.66m/S
Explanation:
Hello!
we will solve this exercise numeral by numeral
a) to find the time the ball takes in the air we must consider that vertically the ball experiences a movement with constant acceleration whose value is gravity (9.81m / S ^ 2), that the initial vertical velocity is zero, we use the following equation for a body that moves with constant acceleration
where
Vo = Initial speed =0
T = time
g=gravity=9.81m/s^2
y = height=60m
solving for time
T=3.5s
b)The horizontal speed remains constant since there is no horizontal acceleration. with the value of the distance traveled (100m) and the time that lasts in the air (3.5s) we estimate the horizontal speed
c)
to find the final vertical velocity we use the equations for motion with constant velocity as follows
Vf=Vo+g.t
Vf=0+(9.81 )(3.5)=34.335m/S
d)Finally, to find the resulting velocity, we add the horizontal and vertical velocities vectorially, this is achieved by finding the square root of the sum of its squares
Answer:
a) 0.25m
b) 5 m/s
Explanation:
When the spring is compressed both boxes are moving with the same velocity, so applying the principle of linear momentum conservation:
Now applying the principle of energy conservation:
We got that the maximum compression is 0.25m.