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Talja [164]
3 years ago
14

A dolphin can swim at a constant speed of 12.5 m/s. How

Physics
2 answers:
myrzilka [38]3 years ago
6 0

Answer:

\boxed {\tt 3.6 \ seconds}

Explanation:

Time can be found by dividing the distance by the speed.

t=\frac{d}{s}

The distance is 45 meters and the speed is 12.5 meters per second.

d= 45 \ m \\s= 12.5 \ m/s

t=\frac{45 \ m}{12.5 \ m/s}

Divide. Note that the meters, or "m" will cancel each other out.

t=\frac{45 }{12.5 \ s}

t=3.6 \ s

It will take the dolphin 3.6 seconds to swim a distance of 45 meters are 12.5 meters per second.

wlad13 [49]3 years ago
3 0

Answer:3.6 seconds

Explanation: 45/12.5 m/s is 3.6s

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Find the magnitude of acceleration (ft/s^2) a person experiences when he or she is texting and driving 58mph, hits a wall, and c
SVEN [57.7K]

Answer:

350 ft/s²

Explanation:

First, convert mph to ft/s.

58 mi/hr × (5280 ft/mi) × (1 hr / 3600 s) = 85.1 ft/s

Given:

v₀ = 85.1 ft/s

v = 0 ft/s

t = 0.24 s

Find: a

v = at + v₀

a = (v − v₀) / t

a = (0 ft/s − 85.1 ft/s) / 0.24 s

a = -354 ft/s²

Rounded to two significant figures, the magnitude of the acceleration is 350 ft/s².

7 0
4 years ago
Explain why a plant may look green in sunlight but under red lighting
umka2103 [35]

plants look green in sunlight because, all other colors except green are absorbed by the plants and only green color is reflected back, hence plants look green in sunlight.

8 0
3 years ago
Crumbling asphalt on a busy city thoroughfare has led to potholes deep enough to snap a wheel off an axle. Which of the four mai
ivann1987 [24]

Answer:

C. Roadway

Explanation:

"Potholes" are considered major contributors of vehicle accidents. This is the reason why the roadway is often maintained by the government. This happens due to natural <em>wear-and-tear situations</em> or to<em> a base that has not been properly compacted. </em>

There are primarily<u> four main causes of accidents</u>: t<em>he driver, the vehicle, the roadway and the weather.</em> In the situation above, it is obviously clear that the "roadway" is the one involved in the situation. The condition or state of the road is a factor that also contributes to accidents. Such potholes should be repaired.

So, this explains the answer.

5 0
3 years ago
If the temperature of an iron sphere is increased
lesya692 [45]
<h2>Answer: its density will decrease</h2>

By increasing the temperature of the iron sphere, its volume will increase (due to the material of which it is composed), this is a phenomenon known as<em> thermal dilation</em>. However, the mass of the sphere will remain the same.

On the other hand, density D is a characteristic property of substances and materials and is defined as the relationship between the mass m and volume V of a specific substance or material, as shown below:

D=\frac{m}{V}

This means <u>density is inversely proportional to volume</u>. Therefore, increasing the temperature of the iron sphere, its volume will be increased and <em><u>its density will be decreased</u></em>.

5 0
3 years ago
1. refers to all liquid fresh water located above ground.
AleksandrR [38]

Answer:

1- Surface water

2- Groundwater

3- Lake

4- River

5- Watershed/Catchment basin

6- Wetland

Explanation:

  • Surface water refers to all the water bodies that are present on the surface of the earth. This includes rivers, streams, ponds, lakes.
  • Groundwater refers to the subsurface flow of water. When precipitation occurs, the water percolates downward through the rocks in the region where the rocks are porous and permeable, and this water then becomes groundwater.
  • A lake is usually defined as a large water body that is comprised of nutrient minerals and has extensive areas of open water. The depth of the lakes from one place to another and some are so deep that sunlight cannot penetrate into the deeper zone and the plants cannot carry out the process of photosynthesis.
  • A river is defined as a water body that flows from a region of higher elevation to the region of lower elevation and it flows across the land surface and configures the landscape.
  • Catchment basin is usually defined as a large area in which the precipitation occurs and the waters are accumulated and flow downward and mix up with the river channel and streams.
  • Wetlands are usually defined as an ecosystem that is comprised of shallow standing water, and a sufficient amount of vegetation.
7 0
3 years ago
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