Answer: F = 2917.2N
Explanation: To solve the question, we will employ Newton 2nd law of motion.
After hitting, the ball stop and no rebound.
The force exert by the ball is equal to the average force the fist will exert on the head.
Please find the attached file for the solution
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.
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Answer:Both Techs A and B are correct. The correct option is C.
Explanation:
Exhaust emissions are gases that are expelled from vehicle engines and they include carbon monoxide, unburned fuel, nitrogen oxides and particulate matter such as mercury. These emissions can cause air pollution and green house effects which leads to climate changes. Low exhaust emissions can be achieved through the use of lean mixtures which has high air- fuel ratio and less emission. Therefore, Tech A is correct.
Rich mixtures are mixtures that are of low air- fuel ratios and it's burning in a diesel engine increases particulate matter emission, fouls spark plugs, causes incomplete burning. Therefore Tech B is equally correct. Hope this helps, thanks.
Answer:
<u>Box 1</u>
Explanation:
Formula we are using :
<u>Force = mass × acceleration</u>
or
<u>mass = Force / acceleration</u> (since mass needs to be found)
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Box 1 :
⇒ mass = 5 N / 5 m/s²
⇒ mass = 1 kg
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Box 2 :
⇒ mass = 5 N / 0.75 m/s²
⇒ mass = 5 × 4/3 = 20/3 kg
⇒ mass = 6.67 kg
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Box 3 :
⇒ mass = 5 N / 4.3 m/s²
⇒ mass = 50/43 kg
⇒ mass = 1.16 kg
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On comparing Box 1, Box 2, and Box 3, we understand that <u>Box 1</u> has the smallest mass