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4 years ago

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Is this statement an observation or an inference? It must be raining outside. Explain.

1 answer:

svet-max [94.6K]4 years ago

5 0

The word must means that it is an inference. If you removed that word it would be an observation as it would mean you're seeing it.
However must implies that you can't see it and you are inferring the fact it's raining from another source, example the sound on the window.

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Hi there! Can someone help me out please?

Eva8 [605]

Hello, some examples are Earth science, chemistry and Navigation science (don't know if there is called in this way).

In Earth Science we can talk about Geomagnetism.

In Chemistry, electrostatics and electrochemistry.

In Navigation science the compass.

Hope it helped.

6 0

3 years ago

A baseball is thrown at an angle of 25 degrees relative to the ground at a speed of 23 m/s. If the ball was caught 42 m from the

ExtremeBDS [4]

Answer:

a) $v_{0y} = 9.72 m/s$

b) $v_{0x} = 20.85 m/s$

c) $t = 2.01 s$

d) $h_{max} = 4.82 m$

Explanation:

a) The initial vertical velocity is given by:

$v_{0y} = v*sin(\theta)$

Where:

θ: 25°

v: is the magnitude of the speed = 23 m/s

$v_{0y} = 23 m/s*sin(25) = 9.72 m/s$

b) The initial horizontal velocity can be calculated as follows:

$v_{0x} = v*cos(\theta) = 23 m/s*cos(25) = 20.85 m/s$

c) The flight time can be calculated using the following equation:

$v_{0x} = \frac{x}{t}$

Where:

x: is the total distance = 42 m

$t = \frac{x}{v_{0x}} = \frac{42 m}{20.85 m/s} = 2.01 s$

d) The maximum height is given by:

$v_{fy}^{2} = v_{0y}^{2} - 2gh_{max}$

Where:

$v_{fy}$ : is the final vertical velocity =0 (at the maximum heigth)

g: is the gravity = 9.81 m/s²

$h_{max} = \frac{v_{0y}^{2}}{2g} = \frac{(9.72 m/s)^{2}}{2*9.81 m/s^{2}} = 4.82 m$

I hope it helps you!

7 0

3 years ago

two forces 3N and 4N act on 20kg mass. calculate the magnitude of the resultant force if the angle between the two forces is 60°

SCORPION-xisa [38]

Explanation:

In the picture.

I hope that it's a clear solution.

6 0

3 years ago

Read 2 more answers

The area of the velocity time graph gives displacement of the body true or false?

mote1985 [20]

The area of the velocity time graph gives displacement of the body true or false?

The answer this is true.

8 0

3 years ago

Read 2 more answers

100 meters toward the shore in 25 seconds

Rzqust [24]

Answer:

The speed of a turtle is 4m/s

Explanation:

speed = distance/time

distance = 100m

time = 25s

s = 100/25

= 4m/s

6 0

4 years ago