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Nady [450]
3 years ago
7

Which is not a step in the scientific method?

Physics
1 answer:
tensa zangetsu [6.8K]3 years ago
5 0
A. Ask other people for their opinion. :)
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Which is not true of friction? A. Causes wear and tear of the surfaces B. Helps us to fall easily on roads C. Produces heat D. P
Ganezh [65]

Answer:

B.

Hope this helps

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2 years ago
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A scientist wants to learn about Earth's oceans. Which of the following
ahrayia [7]
Hydrosphere - all the waters on the earth’s surface.
8 0
3 years ago
A 0.6 kg block attached to a spring of force constant 13.6 N/m oscillates with an amplitude of 9 cm. Find the maximum speed of t
mash [69]

Answer:

1) 0.43 meters per second

2) 0.21 meters per second

3) 1.02 \frac{m}{s^{2}}

4) 0.66 seconds

Explanation:

part 1

By conservation of energy, the maximum kinetic energy (K) of the block is at equilibrium point where the potential energy is zero. So, at the equilibrium kinetic energy is equal to maximum potential energy (U):

K=U

\frac{mv^2}{2}=\frac{kx_{max}^2}{2}

With m the mass, v the speed, k the spring constant and xmax the maximum position respect equilibrium position. Solving for v

v=\sqrt{\frac{kx_{max}^2}{m}}=\sqrt{\frac{(13.6)(0.09m)^2}{0.6}}=0.43\frac{m}{s}

part 2

Again by conservation of energy we have kinetic energy equal potential energy:

\frac{mv^2}{2}=\frac{kx_{max}^2}{2}=

v=\sqrt{\frac{kx_{max}^2}{m}}=\sqrt{\frac{(13.6)(0.045m)^2}{0.6}}=0.21\frac{m}{s}

part 3

Acceleration can be find using Newton's second law:

F=ma

with F the force, m the mass and a the acceleration, but elastic force is -kx, so:

-kx=ma

a= -\frac{kx}{m}=-\frac{(13.6)(0.045)}{0.6}=-1.02\frac{m}{s^{2}}

part 4

The period of an oscillator is the time it takes going from one extreme to the other one, that is going form 4.5 cm to -4.5 cm respect the equilibrium position. That period is:

T=2\pi\sqrt{\frac{m}{k}}=T=2\pi\sqrt{\frac{0.6}{13.6}}=1.32s

So between 0 and 4.5 cm we have half a period:

t=\frac{T}{2}=0.66s

7 0
3 years ago
How do defy gravity?
kaheart [24]
Exert force upward.
Like when you pick something up from the floor, or walk up the stairs.
6 0
3 years ago
Variations in the resistivity of blood can give valuable clues about changes in various properties of the blood. Suppose a medic
Andre45 [30]

Answer:

ρ = 1.70 Ωm

Explanation:

given data

diameter = 1.8 mm

distance = 4.8 cm

volt = 9 V

potential difference = 280

solution

we know that Resistance that is express as

Resistance =  \frac{V}{I}   ..............1

V = I × R

and

V = I  × \frac{\rho L}{A}    ..........2

put here value we get

9 = 280 ×10^{-6} × \frac{\rho \times 0.048}{\pi \times 0.9^2 \times 10^{-6} }  

ρ = 1.70 Ωm

4 0
3 years ago
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