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4 years ago

12

Which factor makes the mesosphere difficult to study? It is too high for weather balloons It is too high for satellites to obser

ve Cloud cover makes it too hard to see The ozone layer blocks our view
SCIENCE

1 answer:

riadik2000 [5.3K]4 years ago

3 0

Cloud cover makes it hard to see

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A parachute on a drag race car opens and changes the velocity of the car from 75 m/s to 45 m/s in 8 seconds. Calculate the avera

nikdorinn [45]

Buscalo en gugal byy

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3 years ago

Aaron rode her bike to his house to play cards he Road for 1.6 hours at 6.5 KMH another 15 minutes at four KMH what was her aver

Kay [80]

Answer:

The average speed during the trip is 6.16 $\frac{km}{hour}$

Explanation:

Speed is a physical quantity that expresses the variation in position of an object and as a function of time. In other words, speed expresses the relationship between the space traveled by an object, the time used for it and its direction.

The speed can be calculated by the expression:

$Speed=\frac{distance}{time}$

Aaron rode his bike home for 1.6 hours at 6.5 km/h and another 15 minutes at 4 km/h. So, the distance in each of the stages can be calculated as, taking into account that 60 minutes= 1 hour:

distance1=speed*time= 6.5 $\frac{km}{h}$ *1.6 hours= 10.4 km

distance2= speed*time= 4 $\frac{km}{h}$ *15 minutes= 4 $\frac{km}{h}$ *0.25 hours= 1 km

So:

total distance= 10.4 km + 1 km= 11.4 km
total time= 1.6 hours + 0.25 hours= 1.85 hours

Then:

$Speed=\frac{11.4 km}{1.85 hours}$

$Speed=6.16\frac{km}{hour}$

<u><em>The average speed during the trip is 6.16 </em></u> $\frac{km}{hour}$ <u><em></em></u>

8 0

3 years ago

Subduction occurs as a result of:__________

lutik1710 [3]

Answer:

a) Gravity pulling the older and denser lithosphere downward.

Explanation:

Earth's crust is made of plates which float on mantle . Plates are of two types

1 ) oceanic plates which are older and heavier 2 ) continental plates which are lighter . Continents are situated on continental plates. Due to relative motion , oceanic plate, because of its heavy weight, goes under lighter continental plate . This is called subduction.

6 0

3 years ago

How do you calculate concrete weight per cubic yard?

Vinvika [58]

Total weight = Volume × density

5) calculate weight of concrete slab by multiplying volume and their density in similar unit as Weight = Volume× density, density= 150lb/ cf, so total weight = 33 cf × 150 lb/cf = 4950 pounds or 2.475 short tons.

6 0

3 years ago

Air at 20ºC with a convection heat transfer coefficient of 20 W/m2·K blows over a pond. The surface temperature of the pond is 2

dimulka [17.4K]

Answer:

The heat flux between the surface of the pond and the surrounding air is<em> 60 W/</em> $m^{2}$ <em> </em>

Explanation:

Heat flux is the rate at which heat energy moves across a surface, it is the heat transferred per unit area of the surface. This can be calculated using the expression in equation 1;

q = Q/A ...............................1

since we are working with the convectional heat transfer coefficient equation 1 become;

q = h ( $T_{sf} -T_{sd}$ ) ........................2

where q is the heat flux;

Q is the heat energy that will be transferred;

h is the convectional heat coefficient = 20 W/ $m^{2}$ .K;

$T_{sf}$ is the surface temperature = $23^{o}$ C 23°C + 273.15 = 296.15 K;

$T_{sd}$ is the surrounding temperature = $20^{o}$ C = 20°C + 273.15 = 293.15 K;

The values are substituted into equation 2;

q = 20 W/ $m^{2}$ .K ( 296.15 K - 293.15 K)

q = 20 W/ $m^{2}$ .K ( 3 K)

q = 60 W/ $m^{2}$

Therefore the heat flux between the surface of the pond and the surrounding air is 60 W/ $m^{2}$

3 0

4 years ago