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Alex17521 [72]
3 years ago
6

I'm Always in front of you. but you never see me. what am i?​

Physics
1 answer:
raketka [301]3 years ago
8 0

Answer:

air is the answer to the question

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If an object is dropped from a tall building and hits the ground 3.0 s later, how tall is the building?
allsm [11]
D = 1/2 g t^2. It works out to 44.1 meters.
6 0
3 years ago
What frequency (in Hz) is received by a person watching an oncoming ambulance moving at 116 km/h and emitting a steady 950 Hz so
Arte-miy333 [17]

To solve this problem we will apply the concepts related to the Doppler Effect, defined as the change in apparent frequency of a wave produced by the relative movement of the source with respect to its observer. Mathematically it can be written as

f_{obs} = f(\frac{v_w}{v_w-v_s})

Here,

f_s= Frequency of the source

v_w = Speed of the sound

v_s= Speed of source

Now the velocity we have that

v_s = 116km/h (\frac{1000m}{1km})(\frac{1h}{3600s})

v_s = 32.22m/s

Then replacing our values,

f_{obs} = (950Hz) (\frac{345m/s}{345m/s-32.22m/s})

f_{obs} = 1047.86Hz

Therefore the frequency of the observer is 1047.86Hz

8 0
3 years ago
Round off to the nearest one (units place):
Elina [12.6K]

Answer:

a

Explanation:

7 0
3 years ago
Read 2 more answers
Please help fast, 30 Points, Brainliest Answer
maksim [4K]

A.) Cubic meters is your answer

Cubic meters are used to measure the volume of solids.

hope this helps

4 0
3 years ago
2. How long will it take for a ball thrown vertically upward with an initial velocity of
KengaRu [80]

Answer:

13.33 seconds

Explanation:

At maximum height, the equation of motion becomes:

<em> v = u + at</em>

Since the object was thrown vertically, the initial velocity (u) is zero and the acceleration (a) becomes the acceleration due to gravity (10 m/s2). The equation becomes:

<em>v = at</em>

<em>v = 480 k</em>m/hr = 133.333 m/s

    10t = 133.333

       t = 133.333/10

           t = 13.33 seconds.

<em>The time for the ball thrown vertically with a velocity of 480 km/hr to reach the maximum height is </em><em>13.33 seconds</em><em>.</em>

6 0
3 years ago
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