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3 years ago

How many revolutions does the object make during the first 4.0 s?

1 answer:

8 0

<span>Radians/second * seconds = Radians BUT the angular velocity is not constant in this case so we need to integrate ω over time. We know this integral is the area under the curve which we can find using the plot: 20rad/s*2s + (10+5) + 10*0.4 = 59 radians 59 radians * 1rev/2π radians = 59/2π = 9.4 revolutions</span>

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A whale swims due east for a distance of 6.9 km, turns around and goes due west for 1.8 km, and finally turns around again and h

Amiraneli [1.4K]

Answer:

Explanation:

a) Total distance traveled by the whale = 6.9 km + 1.8 km + 3.7 km = 12.4 km

b) the magnitude and the direction of the displacement of the whale = 6.9 km due east - 1.8 km due west = 5.1 due east

it final displacement = 5.1 km due east + 3.7 k due east = 8.8 km due east

c) average speed in km / hr = total distance traveled / total time = 12.4 km / 0.5 hr ( 30 min/ 60 min × 1 hr) = 24.8 km / hr

d) average velocity in km / h = total displacement / total time = 8.8 km / 0.5 h = 17.6 km/h

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3 years ago

A boat moving at 7.8 km/hr relative to the water is crossing a river 3.5 km wide in which the current is flowing at 2.8 km/hr. A

Free_Kalibri [48]

Answer: $\theta =21.03^{\circ}$

Explanation:

Given

velocity of boat with respect to river $=7.8 km/hr$

velocity of river is $2.8 km/hr$

River is 3.5 km wide

Suppose boat leaves at an angle of $\theta$ with vertical such that it reaches exactly opposite end of initial Point

Therefore

$7.8\sin \theta$ component will balance the river Flowso that sin component helps to cross the river

$7.8\sin \theta =2.8$

$\sin \theta =0.3589$

$\theta =sin^{-1}(0.3589)$

$\theta =21.03^{\circ}$

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3 years ago

PLEASE HELPPPPP WILL GIVE BRAINLIEST

aliya0001 [1]

B. Unless you add more water molecules or you add a new substance, the mass should stay the same no matter what.

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3 years ago

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kkurt [141]

Explanation:

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3 years ago

13) Compare primary and secondary succession of an ecosystem. What is the distinction between them?

Nana76 [90]

Primary succession is the establishment of a community in an area with ni soil, while secondary succession is the establishment of a new community in an existing ecosystem that was disturbed by some catastrophic events.

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3 years ago