Answer:
Explanation:
4
Jim starts walking from a bus stop. He walks north for 10 km. Next, he walks east for 5 km. He then walks south for 10 km. Next, he walks west for 5 km and arrives back at the bus stop. Which statement correctly represents Jim’s journey?
A. He covered a distance of 15 km and had a displacement of 15 km.
B. He covered a distance of 20 km and had a displacement of 10 km.
C. He covered a distance of 30 km and had a displacement of 0 km.
D. He covered a distance of 10 km and had a displacement of 20 km.
Answer:
b
Explanation:
Which of the following statements is true?
An input device receives information from the computer and an output device sends information to the computer.
An output device receives information from the computer and an input device sends information to the computer.
Neither statement is true.
In the context of mechanical systems, what does the term efficiency mean?
A.
the factor by which a machine multiplies a force
B.
the ratio of a machine’s power to the force of its input
C.
the rate at which a machine performs work
D.
the rate at which a machine consumes energy
E.
the ratio of the work output of a machine to the work input
Answer:
C
Explanation
found it on the internet
Answer:
It's actually E.
Explanation:
The efficiency of a machine is the fraction of the input energy that the machine converts into useful work at the output
Shielding gases are used to protect the molten metal from what?
Answer:Oxygen,Carbon dioxide,Nitrogen
Explanation:
Shielding gases are used to protect the molten metal from atmospheric gas.
Shielding gases are inert gases that are used in different welding processes.Shielding gases are used to protect the weld area from oxygen (O2), and water vapor.Therefore, these gases protect the weld pool from oxidation and nitrogen absorption.In conclusion, shielding gases are used to protect the molten metal from atmospheric gas.
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