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I am Lyosha [343]

3 years ago

9

Wants to slide his 430g water bottle precisely 12m to land inside a Bull's Eye! If the coefficient of kinetic friction between t

he bottle and the surface is 0.62, calculate the initial speed he must release the bottle?

1 answer:

AleksAgata [21]3 years ago

3 0

Answer:

Ff = u M g frictional force where u = .62

1/2 M v^2 kinetic energy of water bottle at release

Ff * d = 1/2 M v^2 = u M g d work to stop equals initial kinetic energy

v^2 = 2 u g d = 2 * .62 * 9.8 * 12 = 146 m^2 / s^2

v = 12.1 m/s

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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

Three charged particles are placed at each of three corners of an equilateral triangle whose sides are of length 3.3 cm . Two of

sweet [91]

Answer:

$1.44\times 10^{-3}$ N

Explanation:

We are given that three charged particle are placed at each corner of equilateral triangle.

$q_1=-8.2 nC,q_2=-16.4 nC,q_3=8.0nC$

$q_1=-8.2\times 10^{-9} C$

$q_2=-16.4\times 10^{-9} C$

$q_3=8.0\times 10^{-9} C$

Side of equilateral triangle =3.3 cm= $\frac{3.3}{100}=0.033m$

We know that each angle of equilateral angle= $60^{\circ}$

Net force=F = $\sum\frac{kQq }{d^2}$

Where k= $9\times 10^9 Nm^2/C^2$

If we bisect the angle at $q_3$ then we have 30 degrees from there to either charge.

Direction of vertical force due to charge $q_1$ and $q_2$

Therefore, force will be added

Vertical force= $9\times 10^9\times q_3(q_1+q_2)\frac{cos30}{(0.033)^2})$

Vertical net force= $9\times 10^9\times 8\times 10^{-9}(-8.2-16.4)\times 10^{-9}\times 10^6\times\frac{\sqrt3}{2\times 1089}$

Vertical force = $9\times 8(-24.6)\times 10^{-9}\times 10^6\times 1.732\times \frac{1}{2178}$

Vertical force= $-1.41\times 10^{-3}N$ (towards $q_1}$

Horizontal component are opposite in direction then will b subtracted

Horizontal force= $9\times 10^9\times 8\times 10^{-9}(-8.2+16.4) \times 10^{-9}\times \frac{sin30}{(0.033)^2}$

Horizontal force= $0.27\times 10^-3}$ N(towards $q_2$

Net electric force acting on particle 3 due to particle = $\sqrt{F^2_x+F^2_y}$

Net force= $\sqrt{(-1.41\times 10^{-3})^2+(0.27\times 10^{-3})^2}$

Net force= $1.44\times 10^{-3}$ N

3 0

3 years ago

A 0.86 kg rock is projected from the edge of the top of a building with an initial velocity of 8.65 m/s at an angle 46◦ above th

Georgia [21]

Answer:

Height of the building = 11.4 m

Explanation:

As we know that the stone is projected at an angle 46 degree with speed 8.65 m/s

so the two components of the speed is given as

$v_x = 8.65 cos46$

$v_x = 6 m/s$

vertical component of the speed is given as

$v_y = 8.65 sin46$

$v_y = 6.22 m/s$

now we know that the ball strike at horizontal distance of 13.7 m

so we will have

$x = v_x t$

$13.7 = 6 t$

$t = 2.28 s$

now we know that in vertical direction ball will move under uniform gravity so we can use kinematics

$y = v_y t + \frac{1}{2}at^2$

$y = 6.22(2.28) - \frac{1}{2}(9.81)(2.28^2)$

$y = -11.4 m$

Height of the building = 11.4 m

3 0

3 years ago

Read 2 more answers

Metals are good conductors of electricity because they _________

Gnesinka [82]

Metals are good conductors because the molecules that are inside the metal are tightly packed together. This is why the heat moves through the metal quickly.

6 0

3 years ago

An electric field of 710,000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of

Anni [7]

Answer:

The magnitude of force is $4.26\times 10^{- 6} N$

Solution:

As per the question:

The strength of Electric field due west at a certain point, $\vec{E_{w}} = 710,000 N/C$

Charge, Q = - 6 C

Now, the force acting on the charge Q in the electric field is given by:

$\vec{F} = Q\vec{E_{w}}$

$\vec{F} = -6\times 710,000 = - 4.26\times 10^{- 6} N$

Here, the negative sign indicates that the force acting is opposite in direction.

5 0

3 years ago