A chemist finds that when platinum is added to a reaction, the reaction speeds up. He thinks the platinum may be acting as a cat
2 answers:
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167.67 Joules of work are done by the gravitational force on the crate.
Force is defined as the product of the mass of the object and acceleration. The SI unit of the force of Newton.
Gravitational force is the force applied by gravity on an object. The gravity of the earth is 9.8 m/s².
Force = Mass × Acceleration
F = m × a
Mass of the crate = 10 kg
The initial speed of the crate = 1.50 m/s
The pulling force = 100 N
Horizontal angle made by the crate = 20 °
Coefficient of kinetic friction = 0.400
The crate is pulled to a height of 5 m.
Work done by the gravitational force on the crate is,
Work done by gravitational force = mass × gravity × height
Therefore, 167.67 Joules of work is done by the gravitational force on the crate.
To know more about force, refer to the below link:
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Answer and explanation:
When you are changing a car tire, the most important thing is to keep the total diameter as equal as possible.
The total car tire diameter can be calculated as:
The profile of this tire is 75 (the higher/taller relation), therefore a 5 percent lower profile would be:
pr=0.95·75=71.25
The problem is that the profiles are normalized and the nearest profile available is 70.
If we take a theorical tire with a profile of 71.25:
The theorical tire size should be 205/71 R15.
If we look for a real tire size, we should look for a tire with a diameter nearest to 26.5'' and a profile of 70.
The best option for real tire size is: Tire 225/70 R14 (wheel diameter of 26.4'') or 205/70 R15 (wheel diameter of 26.3'').