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Sonbull [250]
3 years ago
9

a toy car moves around a loop-the-loop track.The loop is 0.5 high.What is the minimum speed of the car at the top of the loop fo

r it to stay on track?
Physics
1 answer:
Sunny_sXe [5.5K]3 years ago
3 0

Answer:

The speed of the car at the apex of the loop must be grater than 2.45 m/s

Explanation:

In order for the car to not fall off the track at the apex of the loop, the norm force of the track at the apex must be greater than zero.

Assuming frictionless life on the track which is also to have a perfectly circular shape near the top (radius being 0.25m), the norm force of the track and gravity both point down and result in the centripetal force:

F_c=F_N+F_g

The formula for centripetal force on a circular trajectory is

F_c = m\frac{v^2}{r}

and so the condition for the car to stay on the track can be written as

m\frac{v^2}{r} = F_N + mg\implies F_N = m\frac{v^2}{r}-mg>0\\\implies |v| >\sqrt{gr}=\sqrt{9.8\frac{m}{s^2}0.25m}=2.45\frac{m}{s}

The speed of the car at the apex of the loop must be grater than 2.45 m/s


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Answer: The first law of thermodynamics describes how the heat added to a system is conserved.

Explanation:

According to the first law of thermodynamics:  

<em />

<em>"Energy is not created, nor destroyed, but it is conserved."  </em>

Therefore, this law relates the work and the transferred heat exchanged in a system through the internal energy, which is neither created nor destroyed, <u>it is only transformed.  </u>

In other words: The change in the internal energy of a system is equal to the net heat that is transferred to it plus the net work done on it.

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4 years ago
A possible explanation for a set of facts that can be tested by further investigation is called a blank
nadezda [96]

Answer;

Hypothesis

Explanation;

A hypothesis  is a tentative explanation that accounts for a set of facts and can be tested by further investigation. Scientific hypotheses must be posed in a form that allows them to be tested.

- It represents a possible explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation. Once you do the experiment and find out if it supports the hypothesis, it becomes part of scientific theory. An example of a hypothesis; Hypothesis: Bacterial growth may be affected by temperature.

3 0
3 years ago
Read 2 more answers
In an experiment you measure a first-order red line for Hydrogen at an angle difference of ΔΘ = 22.78o. The diffraction grating
azamat

Answer:

a) wavelength = 656.3 nm

b)  the value of Rydberg's constant for this measurement is 1.097 × 10⁷ m⁻¹

Explanation:

Given that;

angle of diffraction Θₓ = 22.78°

incident angle Θ₁ = 0

slit separation d  = 5900 lines per cm = 1/5900 cm = 10⁻²/5900 m = 0.01/5900 m

order of diffraction n = 1

wavelength λ = ?

to find the wavelength, we use the expression

λ = d (sinΘ₁ + sinΘₓ) / n

To find the wavelength λ;

λ = 0.01/5900 × (sin0 + sin22.78° )

λ = 6.5626 × 10⁻⁷ m

λ = 656.3 x 10⁻⁹ m

∴ λ = 656.3 nm

b)

According Balnur's  series spectral lines; n₁ = 3, n₂ = 2 and

λ = R [ 1/n₂² - 1/n₁²]

where  R is Rydberg's constant

from λ = R [ 1/n₂² - 1/n₁²]

R = 1/λ [n₂²n₁² / n₁² - n₂²]

R = 10⁹/ 656.3 [ 9 × 4 / 9 - 4 ]

R = 1.097 × 10⁷ m⁻¹

Therefore the value of Rydberg's constant for this measurement is 1.097 × 10⁷ m⁻¹

4 0
3 years ago
The light reactions could be viewed as analogous to a hydro-electric dam. In that case, the wall of the dam that holds back the
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The light reactions could be viewed as analogous to a hydroelectric dam. In that case, the wall of the dam that holds back the water would be analogous to the thylakoid membrane.

Thylakoid membrane is present in cyanobacteria and chloroplasts of plants. It plays a crucial role in photosynthesis and photosystem II reactions.

In general, these are the regions where light-dependent reactions take place. The thylakoid membrane is a lipid-bound membrane that maintains potential difference and also controls the flow of liquids across the membrane during light reactions.

In the provided case, we can see that the wall of the dam holds back the water, similarly, in light-dependent reactions, thylakoid membranes control the liquid flow and also regulate the potential gradient across the membrane and also allow the selective proteins to pass through.

If you need to learn more about light reactions click here:

brainly.com/question/26623807

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2 years ago
A skateboarder is moving at a constant speed of
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The amount of time that passes from when  this skateboarder begins to slow down until she begins to  move back down the incline is 8.75 seconds.

<u>Given the following data:</u>

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To calculate the amount of time that passes from when  this skateboarder begins to slow down until she begins to  move back down the incline, we would apply the first equation of motion;

<h3>The formula for the first equation of motion.</h3>

Mathematically, the first equation of motion for a decelerating object is given by this formula;

V=U-at

<u>Where:</u>

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Substituting the given parameters into the formula, we have;

1.75 = 0-(-0.2)t\\\\1.75=0.2t\\\\t=\frac{1.75}{0.2}

Time, t = 8.75 seconds.

Read more on acceleration here: brainly.com/question/24728358

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3 years ago
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