1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
r-ruslan [8.4K]
2 years ago
6

A student walls 2 km in 30 minutes. What is the student's average speee in km/h

Biology
1 answer:
const2013 [10]2 years ago
7 0

Answer:

4 km/h

Explanation:

Average speed = Distance / time

Distance = 2 km

Time = 30 minutes = 0.5 hours [For units to match]

Average speed

= 2 / 0.5

= 2 x 2

= 4 km/h

You might be interested in
Somebody knows the answer to this
KiRa [710]
Typically when we think about extreme weather, we think about the effect of weather on humans and other life forms. However, weather events also greatly impact non-living things. Freeze and thaw cycles tend to break up rocks, weathering them physically. Landscape erosion can be greatly enhanced by storms because rivers and streams are able to transport larger amounts and larger sizes of material than they otherwise would, due to faster flow velocities. Sand at beaches is carried away by strong storms until it can be replenished over time. Sediments become hydrated during rainfall events, which can result in landslides and land movement. Many of these processes can create hazards for humans, but the physical landscape is very much shaped by extreme weather events. Weather is weather, which is nonliving. Erosion is affected by weather, the more rain there is, the more erosion. The more temperatures change, the more erosion because things swell as they warm up and shrink as they cool off, which can cause them to break.


Hurricane affects come from both wind and water impacts. Wind and waves break coral, damaging it or forcing it on shore and disrupting the ocean ecosystem. Fish and benthic organisms face turbulent conditions due to waves and wind. ... Winds dislocate sea and migratory birds caught in the eye of the storm.


Some examples of non-living things include rocks, water, weather, climate, and natural events such as rockfalls or earthquakes. Living things are defined by a set of characteristics including the ability to reproduce, grow, move, breathe, adapt or respond to their environment. Extreme heat causes lakes and rivers to dry up. Some kinds of earth can also dry up so much that it gets cracked.

Extreme rainfall causes floods and landslides.

Extreme cold can cause rocks to break, when the water that leaked into cracks in the rock freezes and expands.

If I knew more about the water cycle, I might be able to tell you more about how extreme weather affects clouds and other parts of the water cycle.

4 0
3 years ago
What is an important effect of mars low temperature and low air pressure
stepan [7]

Standing on the ground and looking up, you are looking through the atmosphere. It might not look like anything is there, especially if there are no clouds in the sky. But what you don’t see is air – lots of it. We live at the bottom of the atmosphere, and the weight of all the air above us is called air pressure. Above every square inch on the surface of the Earth is 14.7 pounds of air. That means air exerts 14.7 pounds per square inch (psi) of pressure at Earth’s surface. High in the atmosphere, air pressure decreases. With fewer air molecules above, there is less pressure from the weight of the air above.

Pressure varies from day to day at the Earth’s surface - the bottom of the atmosphere. This is, in part, because the Earth is not equally heated by the Sun. Areas where the air is warmed often have lower pressure because the warm air rises. These areas are called low pressure systems. Places where the air pressure is high, are called high pressure systems.

A low pressure system has lower pressure at its center than the areas around it. Winds blow towards the low pressure, and the air rises in the atmosphere where they meet. As the air rises, the water vapor within it condenses, forming clouds and often precipitation. Because of Earth’s spin and the Coriolis Effect, winds of a low pressure system swirl counterclockwise north of the equator and clockwise south of the equator. This is called cyclonic flow. On weather maps, a low pressure system is labeled with red L.

A high pressure system has higher pressure at its center than the areas around it. Winds blow away from high pressure. Swirling in the opposite direction from a low pressure system, the winds of a high pressure system rotate clockwise north of the equator and counterclockwise south of the equator. This is called anticyclonic flow. Air from higher in the atmosphere sinks down to fill the space left as air is blown outward. On a weather map, you may notice a blue H, denoting the location of a high pressure system.

How do we know what the pressure is? How do we know how it changes over time?  Today, electronic sensors in weather stations measure air pressure. These sensors are able to make continuous measurements of pressure over time. In the past, barometers were used and measured how much air pushed on a fluid, such as mercury. Historically, measurements of air pressure were described as “inches of mercury.” Today, meteorologists use millibars to describe air pressure.

Air pressure depends on temperature and density.

When you inflate a balloon, the air molecules inside the balloon get packed more closely together than air molecules outside the balloon. This means the density of air is high inside the balloon. When the density of air is high, the air pressure is high. The pressure of the air pushes on the balloon from the inside, causing it to inflate. If you heat the balloon, the air pressure gets even higher.

8 0
3 years ago
Read 2 more answers
Xylem _____.
alexandr402 [8]
The definition of Xylem is “the vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps form the woody element in the root system. Therefore the answer is “transport water and minerals upward.” I hope this helps!
4 0
3 years ago
Read 2 more answers
Your respiratory muscles contract each time you exhale.<br><br><br> TrueFalse
Virty [35]
False,your respiratory muscle expand each time when you exhale.
6 0
3 years ago
Pleeeasseee i need help
Harman [31]

Answer:

"DRY MIX"

Dependent responding (variable) X axis

Manipulated independent (variable) Y axis

The drinks is the dependent variable because it "responds" to the temperature and is "dependent" on the temperature. The temperature determines the drinks sold-but the drinks sold doesn't determine the temperature.

7 0
2 years ago
Other questions:
  • Earthquakes are possible because the tectonic plates around the earth shift and move, converging, diverging, or transforming whe
    6·2 answers
  • What is the temperature of the boiled water at the top of Mount Everest
    13·2 answers
  • The lipid bilayer molecules do what for the cell? A. help cells recognize each other B. allow food molecules into the cell C. pr
    6·2 answers
  • Read the following scenarios and answer the question in each one.
    6·1 answer
  • What are the causes of genetic variation
    10·1 answer
  • Explain how human activities can intensify, or even cause a landslide
    15·2 answers
  • What is the albedo effect?<br><br> Do you think the earth is warming up?
    12·2 answers
  • Short paragraph to encourage people not to engage in rhino poaching ​
    9·2 answers
  • Quiz Active 1 2 3 4 5 6 7 In the formula for average rate of change, what does the triangle in front of the x and y stand for? a
    7·1 answer
  • A patient with type 2 diabetes eats a high-protein, very low-carbohydrate diet to try to lose weight. the main long-term concern
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!