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
#learnwithBrainly
90km/4hrs=22.5kn/hr average speed. Her dispacement is 0. Her trip started and ended in the same place.
Any metal element can form a positive ion because they lose electrons to become stabilized
Gravity constantly acts on the apple so it goes faster and faster ... in other words it accelerates.
Ignoring air resistance, its velocity increases by 9.8 meters per second every second. That is two lots of "per second" and is written:
9.8 m/s2
9.8 m/s2 is the acceleration due to gravity near the Earth's surface. Nearly everything in our lives happens near the Earth's surface, so that value gets used a lot, and is written as a little g:
g = 9.8 m/s2
The average value of g is 9.80665 m/s2, but values are different around the world, such as Calcutta at 9.78548, London at 9.81599 and Tokyo at 9.79805.
So most people just use 9.8 m/s2
Answer:
Shear stress on upper plate = 837.4N/m2
Shear stress when the linear velocity profile were assumed = 418.7N/m2
Explanation:
The detailed and step by step calculation and appropriate differentiation to get the shear stress is as shown in the attachment.