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Hunter-Best [27]
4 years ago
5

Select all that apply. A hypothesis is _____. always correct determined before experimentation begins the experimental factor th

at changes in response to a change in the independent variable testable and falsifiable
Physics
1 answer:
rodikova [14]4 years ago
3 0
I believe a hypothesis is determined before experimentation begins. A hypothesis is a scientific state of prediction. It describes in concrete terms what you expect will happen in ones study. However, not all studies have hypothesis. Often times a study may be designed to be explanatory. A study may have one or more hypothesis. Hypothesis is an educated prediction that can be tested.<span />
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A spotlight on the ground is shining on a wall 24m away. If a woman 2m tall walks from the spotlight toward the building at a sp
Lubov Fominskaja [6]

Answer:

\dfrac{dy}{dt}=-0.059\ m/s

Explanation:

It is given that,

Distance between the spotlight and the wall, y = 24 m

Height of the woman, h = 2 m

The woman walks toward the building at the rate of 0.6 m/s, \dfrac{dx}{dt}=0.6\ m/s

In the attached figure, triangle ABC and MNC are similar. So,

\dfrac{2}{y}=\dfrac{x}{24}............(1)

y=\dfrac{48}{x}

When she is 2 meters from the building. So x = 24-2 = 22 m

y=\dfrac{48}{22}=2.18\ m

Differentiating equation (1) i.e.

xy=48

x.\dfrac{dy}{dt}+y.\dfrac{dx}{dt}=0

22.\dfrac{dy}{dt}+2.18\times 0.6=0

\dfrac{dy}{dt}=-0.059\ m/s

So, her shadow is decreasing at the rate of 0.059 m/s. Hence, this is the required solution.                                

7 0
4 years ago
A spring scale hung from the ceiling stretches by 6.1 cm when a 2.0 kg mass is hung from it. The 2.0 kg mass is removed and repl
Hunter-Best [27]

The ideal spring equation is

                               Stretch  =  K  times  Force  .

This says that the stretch is directly proportional to the force.
In simple English, that means that if you double the force, then
you double the stretch, and if you multiply the force by  π  or
any other number, you multiply the stretch by the same number.

So you can always write a proportion for a spring:

                 Stretch₁ / Force₁  =  Stretch₂ / Force₂ .

Part A:

In Part-A of this question, the force is increased to  (2.5 / 2.0) =  1.25 times .

So the stretch is also increased to  1.25 times .

                 (1.25) x (6.1 cm)  =  7.625 cm  .
6 0
4 years ago
Something is thrown in the air and 5.35 seconds later it lands on something 2.1 meters from the ground. How fast was it thrown u
UNO [17]

Answer:

26.6 m/s

Explanation:

Given:

Δy = 2.1 m

t = 5.35 s

a = -9.8 m/s²

Find: v₀

Δy = v₀ t + ½ at²

(2.1 m) = v₀ (5.35 s) + ½ (-9.8 m/s²) (5.35 s)²

v₀ = 26.6 m/s

5 0
3 years ago
How is the kinetic energy of the particles that make up a substance different
Valentin [98]

All particles have energy, and the energy varies depending on the temperature the sample of matter is in, which determines if the substance is a solid, liquid, or gas. Solid particles have the least amount of energy, and gas particles have the greatest amount of energy

6 0
3 years ago
A star produces energy by? ( a p e x )
katen-ka-za [31]

Answer and Explanation:

Stars create energy primarily through the fusion of hydrogen into helium through nuclear reactions.

3 0
3 years ago
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