Distance/ time = 100/5 = 20 km per hour
The average speed at 5hrs is 20 km per hour.
Answer:
(b) 1/sinƟ
Explanation:
A simple machine can be defined as a type of machine with no moving parts but can be used to perform work.
Basically, a simple machine allows for the transformation of energy into work. The six simple machines are; lever, wedge, pulley, screw, wheel and axle, and inclined plane.
Inclined plane is a simple machine set at an angle and then used to lift an object.
In Physics, the velocity ratio of a simple machine is calculated as a ratio of the distance moved by the effort to the vertical distance through which a load is raised.
Mathematically, the velocity ratio of an inclined plane of angle Ɵ, acting as a simple machine is given by the formula;
Velocity ratio (V.R) = 1/sinƟ
Basically, an increase in the angle of inclination (measured in degrees) of an inclined plane increases its velocity ratio.
Answer:
Chimps and apes are still here because humans did not evolve from all apes and chimps.
Explanation:
The action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
<h3>What is erosion?</h3>
The term erosion has to do with the washing away of top soil either by water or by wind. The control of erosion is a very important soil conservation effort.
Hence, the action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
Learn more about erosion:brainly.com/question/3852201?
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Answer:
(a) 17450.8 J (B) 1.239 sec
Explanation:
We have given power output =8 KW
Heat expelled = 10994 j
Efficiency =37% = 0.37
(A) We know that efficiency 
Heat input =17450.8 J
(B) Work done by the engine is = 17450.8-10994=6456.8 j
Power output is given by 8 KW =8000 W
So time for each cycle is 
