Answer:
22.3Ns
Explanation:
Hi!
To solve this exercise follow the steps below.
1. Find the weight of the stone by multiplying the gravity (9.8m / s ^ 2) by the mass.
W=mg
m=mass=2.5kg
g=gravity=9.8m / s ^ 2
W=(2.5)(9.8)=25.5N
2. Find the time it takes for the stone to touch the ground using the kinematic equation for constant acceleration.
Vf=Vo+a.t
y= VoT+\frac{1}{2}gt^{2}
Where
Vo = Initial speed
=0
T = time
g=gravity=9.8m/s^2
Y= height= 3.75m
solving for time
3. For a constant force such as weight, the impulse is calculated as the product between force and time.
I=wt
I=(25.5N)(0.87S)=22.3Ns
A. a lever
Explanation:
To remove a nail from wood, a lever will be the best machine to use. In a lever, effort is applied to move a large load. The nail is treated as the load.
- Most hammers have nail removers that can be used to pull out nails.
- The force is applied at the handle.
- The head of the hammer has a fulcrum and nail remover part where the load is.
- This gives a large mechanical advantage and the nail can be pulled out.
- Wedge, wheel and axle and movable pulley are not machines that works as nail removers.
learn more:
Pulley brainly.com/question/11442367
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