4 years ago

Which requires more work, carrying a 420 N knapsack up a 200 m hill or carrying a 210 knapsack up a 400 m hill? Why?

Physics

1 answer:

Katen [24]4 years ago

4 0

Answer:

Explanation:

because the weight/work increases bcz of the time period

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A 4500-kg spaceship is in a circular orbit 190 km above the surface of Earth. It needs to be moved into a higher circular orbit

Maslowich

Answer:

Explanation:

Total energy of a satellite in an orbit , h height away

= - GMm /2 ( R + h )

When h = 380 km

Total energy of a satellite = $\frac{6.67\times10^{-11}\times5.97\times10^{24}\times 4500}{2\times(6378+380)\times10^3}$

= - 13.25 x 10¹⁰ J

When h = 190 km

Total energy of a satellite =

$\frac{6.67\times10^{-11}\times5.97\times10^{24}\times 4500}{2\times(6378+190)\times10^3}$

= - 13.63 x 10¹⁰ J

Diff

= 38 x 10⁸ J Energy will be required.

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3 years ago

Jeremiah is riding his bicycle to the east. It takes him 10 seconds to change his velocity from 10 m/s to 15 m/s. What is Jeremi

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Answer:

5 m/s

Explanation:

he accelerates by 5 m/s so he accelerates from 10 m/s to 15 m/s so he accelerates 5 m/s

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4 years ago

A skydiver jumps out of a hovering helicopter, so there is no forward velocity. Ignore wind resistance for this exercise. What i

ipn [44]

Answer:

a = g

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in this scenario, the diver is free-falling, hence his acceleration is equal to the pull of gravity

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2 years ago

Read 2 more answers

A team of eight dogs pulls a sled with waxed wood runners on wet snow (mush!). The dogs have average masses of 18.5 kg, and the

meriva

Answer:

a. $2.86 m/s^2$

b.1058 N

Explanation:

We are given that

Mass of each dog,M=18.5 kg

Mass of sled with rider,m=250 kg

a.Average force,F=185 N

$\mu_s=0.14$

$g=9.8 m/s^2$

By Newton's second law

$8F-f=(8M+m)a$

$a=\frac{8F-f}{8M+m}=\frac{8(185)-(0.14)(9.8)(250)}{8(18.5)+250}$

$a=2.86 m/s^2$

b.By Newton's second law

$T=ma+\mu_s mg$

Substitute the values

$T=250\times 2.86+0.14(250)(9.8)=1058 N$

Hence, the force in the coupling between the dogs and the sled=1058 N

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4 years ago

Does exists the friction force in the universe?If yes,tell an example.I give all my points.If you dont tell me an example of the

kari74 [83]

Friction force does exists in the universe. A person sliding down a slide creates friction. Another example is rubbing your hands together to make warmth.

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