2 years ago

4. What is the formula for potassium dichromateo?b

Physics

1 answer:

Gre4nikov [31]2 years ago

4 0

Formula for potassium dichromate is

K2Cr2O7

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A particle in circular motion performs 30 oscillation in 6 seconds. what is it angular velocity

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Explanation:

ω = 30 rev × (2π rad/rev) / (6 sec)

ω = 10π rad/s

ω ≈ 31.4 rad/s

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3 years ago

Which is defined as a disturbance in matter that carries energy from one place to another?

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an acoustic wave carries energy

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A force is acting on a 3-kg object during 5 seconds. If the object initially has a speed of 1.5m/s and after applying the force

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Answer:

1.5 N

Explanation:

You've left us to guess what the question is. I will Assume it is what's the force?

Givens

m = 3 kg

vi = 1.5 m/s

vf = 4 m/s

t = 5 seconds

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F = m * (vf - vi)/t

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3 years ago

A stone is thrown vertically upward with a speed of 15.0 m/s from the edge of a cliff 75.0 m high.How much later does it reach t

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Answer:

5.72 seconds

848.27 m/s

97.94 m

Explanation:

t = Time taken

u = Initial velocity = 15 m/s

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

$v=u+at\\\Rightarrow 0=15-9.81\times t\\\Rightarrow \frac{-15}{-9.81}=t\\\Rightarrow t=1.52 \s$

Time taken to reach maximum height is 0.97 seconds

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=15\times 1.52+\frac{1}{2}\times -9.81\times 1.52^2\\\Rightarrow s=11.47\ m$

So, the stone would travel 11.47 m up

So, total height stone would fall is 75+11.47 = 86.47 m

Total distance travelled by the stone would be 75+11.47+11.47 = 97.94 m

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Time taken by the stone to travel 86.47 m to the water is is 4.2 seconds

The stone reaches the water after 4.2+1.52 = 5.72 seconds after throwing the stone

$v=u+at\\\Rightarrow v=0+9.81\times 86.47 = 848.27\ m/s$

Speed just before hitting the water is 848.27 m/s

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3 years ago

What is the period and group of gold

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Answer:

Chemical elements, a dense lustrous yellow precious metal of group.

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