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Musya8 [376]
3 years ago
7

Help help help im so bad at science ToT

Physics
1 answer:
valentinak56 [21]3 years ago
3 0
The first one is hydrogen and the second one is dust
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A scientist testing to see how a cat “always” lands on their feet drops a cat upside down out of a third story window at a heigh
makkiz [27]

<u>Answer: </u>

Cat has 2.02 seconds to right itself.

<u>Explanation: </u>

Initial height of cat from ground = 20 meter.

We have equation of motion , s= ut+\frac{1}{2} at^2, s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

In this the velocity of cat in vertical direction = 0 m/s, acceleration = acceleration due to gravity =  9.8 m/s^2, we need to calculate time when s = 20 meter.

Substituting

20=0*t+\frac{1}{2} *9.8*t^2\\ \\ t = 2.02 seconds

So, cat has 2.02 seconds to right itself.

7 0
3 years ago
Out of these people who r ur favs?
pav-90 [236]

Answer:

Is it a sin to like them all...? haha

4 0
3 years ago
Read 2 more answers
3. If you roll a ball up a hill, it undergoes positive<br>acceleration. True or false<br><br>​
Jlenok [28]

Answer:

true

Explanation:

4 0
3 years ago
A mxiture of n2 and H2 has mole fraction of 0.4 and 0.6 respectively. Determine the density of the mixture at one bar and 0 c.
SOVA2 [1]

Answer:

The density of the mixture is 0.55kg/m^3

Explanation:

P = 1bar = 100kN/m^2, T = 0°C = 273K, n = 0.4+0.6 = 1mole

PV = nRT

V = nRT/P = 1×8.314×273/100 = 22.70m^3

Mass of N2 = 0.4×28 = 11.2kg

Mass of H2 = 0.6×2 = 1.2kg

Mass of mixture = 11.2 + 1.2 = 12.4kg

Density of mixture = mass/volume = 12.4/22.7 = 0.55kg/m^3

3 0
3 years ago
e) A escalator carries 60 people of average mass 70kg to a height of 5m in one minute. Find the power needed to do this? 4​
Blababa [14]

Answer:

3500J/s

Explanation:

P=W/T

42000×10×5÷60

=3500J/s

3 0
3 years ago
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