Stevie asked in Science & MathematicsPhysics · 7 months ago

# A bicyclist rides 2.94 km due east, while the resistive force from the air has a magnitude of 7.47 N and points due west.?

A bicyclist rides 2.94 km due east, while the resistive force from the air has a magnitude of 7.47 N and points due west. The rider then turns around and rides 2.94 km due west, back to her starting point. The resistive force from the air on the return trip has a magnitude of 7.47 N and points due east. Find the work done by the resistive force during the round trip.

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• oubaas
Lv 7
7 months ago

work is a scalar quantity, therefore W = 7.47*2.94*2 = 43.9 kjoule

• 7 months ago

Work is a scalar. So you do not consider direction.

You calculate the work done on the way out then the work done on the way back.

You already know that work = force * distance.

And that work is either positive if the force gives energy to something else, or negative if it takes work away from something else..

The work done BY the resistance is a) GIVING energy to the rider or b) TAKING energy from the rider?

So is the answer positive or negative?

• 7 months ago

Are we really alive eating flesh with flies?

◄ Colossians 3:3 ►

For you died, and your life is now hidden with Christ in God.

al-Baqarah 2:28

Reality is merely an illusion, albeit a very persistent one.

Albert Einstein.

"Nothing is as it seems. Nor is it otherwise."

Lankavatara Sutra - Mahāyāna Buddhism

There is no greater mystery than this; that being the reality we seek to gain reality.

Sri Ramana Maharshi

Plato’s cave analogy.

Inprisoned inside the cave (Us), prisoners see the shadows on the wall and mistakenly view the shadows as reality.

Greek word "cosmos" Meaning "In The World" Apart from God

And Christian gnosticism - "Seraphims" Keter - Crown Divine Plan ~ The Angel of Death. (Read John 7:7) Satan is the ruler of this "cosmos" (John 12:31; 16:11; 1 John 5:19)

Islam.

The Surah takes its title from the sentence, Wa anzalna' l-hadida, of verse 25 A study of iron

Hinduism. (Caught up in Samsara – Maya ~ The Malevolant illusion)