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3 years ago

Which of the following is an example of a force?

Physics

1 answer:

nydimaria [60]3 years ago

5 0

Answer:

D) Both A and B

Explanation:

When an object exerts either a push or a pull on another object, this is known as a force.

If you have any questions, just feel free to let me know!

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What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is 5.66 0.09 m?

iren2701 [21]

Answer:

4.77 %

Explanation:

We know that the volume V for a sphere of radius r is

$V(r) = \frac{4}{3} \ \pi \ r^3$

If we got an uncertainty $\Delta r$ the formula for the uncertainty of V is:

$\Delta V(r) = \sqrt{ (\frac{dV}{dr} \Delta r)^2 }$

We can calculate this uncertainty, first we obtain the derivative:

$\frac{dV}{dr} = 3 * \frac{4}{3} \ \pi \ r^2$

$\frac{dV}{dr} = 4 \ \pi \ r^2$

And using it in the formula:

$\Delta V(r) = \sqrt{ (4 \ \pi \ r^2\Delta r)^2 }$

$\Delta V(r) = \sqrt{ 4^2 \ \pi^2 \ r^4 \Delta r^2 }$

$\Delta V(r) = 4 \ \pi \ r^2 \Delta r$

The relative uncertainty is:

$\frac{\Delta V(r)}{V(r)}$

$\frac{ 4 \ \pi \ r^2 \Delta r }{ \frac{4}{3} \ \pi \ r^3}$

$\frac{ 3 \Delta r }{ r}$

Using the values for the problem:

$\frac{ 3 * 0.09 m }{ 5.66 m} = 0.0477$

This is, a percent uncertainty of 4.77 %

4 0

3 years ago

Classify each statement below as an observation or as an inference based on the current Big Bang model. (note that the helium ab

Aleks04 [339]

Answer:

Observations:

Large scale structures look about the same in all directions.
The temperatures of the cosmic microwave background varies slightly with direction.
The cosmic microwave background temperature is approximately 2.73 Kelvin.
The Helium abundance is at least 25% in every galaxy studied so far.

While Inference includes:

Photons of the cosmic microwave background is radiation left over from the Big bang.
The cosmic microwave background is radiation left over from the Big bang.
Fusion during the universe's first five minutes produced 75% hydrogen and 25% helium.
Large-scale structure grew around density variations present in the early universe.

Explanation:

Inference here refers to the process of drawing a conclusion based on what is already known while Observation involves the perception and recording of data via the use of scientific instruments and procedures.

The insights below highlights the explanations for some of the insights used in determining its Observation or Inference status.

The Cosmic Microwave Background, which contains the afterglow of light and radiation is left over from the Big bang.

The Cosmic Microwave Background is black body radiation at a temperature of 2.725 Kelvin.

In the year 1965, a pair of radio astronomers named Arno Penzias and Bob Wilson respectively were working at Bell labs, in New Jersey. Using an antenna that is sensitive to the radiation of microwaves, they discovered an unknown source of static noise. After they tried doing everything possible to reduce the noise, they realized that the microwaves had a black body spectrum, with a characteristic temperature of only T = 2.725 Kelvin ( and maximum wavelength of 1 millimeter). These ever present microwaves seen in every direction are called "Cosmic Microwave Background". This explains the reason behind statement five(5) being an Observation.

Finally, The Cosmos Background Explorer (COBE) which launched a satellite in the year 1989 found that there were slight fluctuations in the radiation spectrum. The temperature varies very slightly from one place to another by a few parts in 100,000 i.e (10^-5). The excerpts above clarify the reason for the answer to statement four(4) being listed as an Observation.

6 0

4 years ago

A fellow student with a mathematical bent tells you that the wave function of a traveling wave on a thin rope is y(x,t)= 2.30mmc

MakcuM [25]

y(x,t)= 2.30mmcos[(6.98rad/m)x + (742 rad/s)t]
A) Amplitude is 2.30mm
B) Frequency 1/2.30mm
C) Wavelength is 6.98rad/m
D) Wave Speed is 742 rad/s
E) Direction the wave is traveling

7 0

3 years ago

There are 2 questions :)

zaharov [31]

I can answer the first question: Water rises because of the sun's heat and turns into water vapor. After that, it gathers up and forms a cloud. When the cloud is filled enough with vapor, precipitation occurs.

3 0

4 years ago

Read 2 more answers

A horizontal force of 100 N is required to push a 50 kg crate across a factory floor at a constant speed. What is the accelerati

luda_lava [24]

Answer:

a = 2m/s^2

Explanation:

Force (F) = 100 N

Mass (m) = 50 kg

Here,

F = m×a

100 = 50 × a

a = 100÷50

a = 2m/s^2

Thus, the acceleration on the cart is a = 2m/s^2

-TheUnknownScientist

6 0

3 years ago