Answer: See explanation
Explanation:
Simple machine is a machine that has few moving parts or may also have no moving parts and they are usually used to make ones work easier. Examples include wheel and axle, wedge, pulley, lever, screw or an inclined plane.
Their advantages include:
• Less energy is required to perform a particular work.
• It makes work easier.
• It makes work faster.
• Simple machine enable one to do things that might have been difficult to achieve or do.
The elbow is considered to be a lever, which is a simple machine. Other levers apart from the elbow are jaw, ankle, knee, etc.
This means that it is false that the <span>elbow is an example of a compound machine found in the human body.</span>
Answer:
Its a cinder cone cause after it all falls down to make deposits.
Answer:
1 Nm
Explanation:
Given;
Force = F = (4, 3, 3)N
Position 1 = P = (3, 3, -1)m
Position 2 = Q = (2, -1, 4)m
The object moves along a straight line path from P to Q, therefore, the distance vector (d) is given by;
d = Q - P
d = (3, 3, -1) - (2, -1, 4)
d = (1, 4, -5)m
Now the work done (W) by the force (F) to move through the distance (d) is the dot product of the two vectors: F and d. i.e
W = F . d
For clarity, let's write vectors F and d in vector unit notation as follows;
F = 4 i + 3 j + 3 k
d = 1 i + 4 j - 5k
Therefore,
W = (4 i + 3 j + 3 k ) . (1 i + 4 j - 5k)
W = (4 + 12 - 15)
W = 1
Therefore, the workdone by the force is 1 Nm
D.the measure of average kinetic energy of molecules of a substance
Explanation:
Temperature is a quantity that measures the average kinetic energy of molecules of substance. It is widely defined as the degree of hotness or coldness of a body.
- Heat, a form of thermal energy causes temperature changes in a body.
- This suggests that for the temperature of a body to change the average kinetic energy of the body must change.
- A body at low temperature has low average kinetic energy for its particles.
- A high kinetic energy is known for hotter bodies with a high temperature.
- Temperature is taken with reference to a scale.
Learn more:
Temperature and kinetic energy brainly.com/question/9924094
Heat brainly.com/question/914750
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