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RUDIKE [14]
3 years ago
15

According to the conservation of momentum, if a small football player collides with a much larger football player, which of the

following statements will be true? a The larger football player will move, but because of his larger mass, his velocity will be much slower than the smaller player b The smaller football player will be stopped completely, his mass being not enough to move the larger one c The larger football player will have to start moving towards the smaller one as it collides if there is to be any effect d The smaller football player will experience a larger force than the larger football player
Physics
1 answer:
Virty [35]3 years ago
8 0

Answer:

a The larger football player will move, but because of his larger mass, his velocity will be much slower than the smaller player

Explanation:

When the collision takes two equal and opposite forces are created at the point of collision . The force created on the bigger mass will force it to accelerate and the force on moving smaller mass will force it to slow down .

Because of bigger mass , acceleration on bigger mass will be less and hence its velocity will be less .

Hence option a is the right answer.

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AnnZ [28]

2 N Right

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4 0
3 years ago
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Two protons are 9.261 fm apart. (1 fm= 1 femtometer = 1 x 10^-15 m.) What is the ratio of the electric force to the gravitationa
Strike441 [17]

Answer:

1.24\times 10^{36}

Explanation:

q = magnitude of charge on each proton = 1.6 x 10⁻¹⁹ C

m = mass of each proton = 1.67 x 10⁻²⁷ kg

r = distance between the two protons = 1 x 10⁻¹⁵ m

Electric force between the two protons is given as

F_{e} = \frac{kq^{2}}{r^{2}}

F_{e} = \frac{(9\times 10^{9})(1.6\times 10^{-19})^{2}}{(1\times 10^{-15})^{2}}

F_{e} = 230.4 N

Gravitational force between the two protons is given as

F_{g} = \frac{Gm^{2}}{r^{2}}

F_{g} = \frac{(6.67\times 10^{-11})(1.67\times 10^{-27})^{2}}{(1\times 10^{-15})^{2}}

F_{g} = 1.86\times 10^{-34} N

Ratio is given as

Ratio =\frac{F_{e}}{F_{g}}

Ratio =\frac{230.4}{1.86\times 10^{-34}}

Ratio = 1.24\times 10^{36}

3 0
3 years ago
Read 2 more answers
3. If the distance of the screen is moved from 100. cm to 200. cm the area of light would in-crease from 150. cm^2 to
german

Answer:

3) C

4 D

5) C

Explanation:

3) given that

Initial distance of the screen = 100cm

Initial area = 150 cm^2

Final distance = 200 cm

The intensity of light is inversely proportional to the square of the distance. That is

Intensity of light I = 1/d2

And also I = P/A

1/d^2 = P/A

P = A/d^2

P1 = P2

150/100 = A/200

1.5 = A/200

A = 1.5 × 200

A = 300 cm^2

4.) Light is projected onto a screen 75.0 cm from a light source. The light intensity = 4436 lux

If the screen is moved from 75.0 cm to 150. cm, the light sensor reading will be

Using inverse square law

I = 1/d^2

I×d^2 = constant. Therefore,

4436 × 75^2 = I × 150^2

I = 24952500/22500

I = 1109 lux

5.) We can express the relationship between luminosity, brightness, and distance with a simple formula.

As we tilt the serene the area of light decreases and makes the light more concentrated.

5 0
3 years ago
In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction, and breaking) Check all
Amiraneli [1.4K]

1) Mechanical energy is conserved in all the situations mentioned

2) True

3) Potential energy

4) The potential energy is 490 J

5) The potential energy is 750,000 J

Explanation:

1)

The mechanical energy of an object is the sum of its potential energy (PE) and its kinetic energy (KE):

E=PE+KE

When there are no conservative forces acting on the object (i.e. air resistance of friction), the mechanical energy is always conserved, so it is constant:

E=const.

This means that there is a continuous conversion between potential energy and kinetic energy.

In all the examples mentioned here, there are no air resistance or friction acting on the system: therefore, mechanical energy is conserved in all cases.

2)

The potential energy of the object falling to the ground is given by

PE=mgh

where

m is the mass

g is the acceleration of gravity

h is the height of the object above the ground

While the kinetic energy is given by

KE=\frac{1}{2}mv^2

where

v is the speed of the object

As the object falls, its height h decreases, while the speed v increases: therefore, the potential energy decreases and it is converted into kinetinc energy, which increases.

3)

The energy possessed by an object due to its position is called potential energy. It can be of two types:

- Gravitational potential energy: it is the energy possessed by an object due to its position in a gravitational field. It is given by

PE=mgh

where m is the mass, g the acceleration due to gravity, h the height of the object

- Elastic potential energy: it is the energy stored in an elastic object which is compressed or stretched - it is given by

PE=\frac{1}{2}kx^2

where k is the spring constant and x the elongation of the object relative to its equilibrium position.

4)

The (gravitational) potential energy stored in the block is calculated  as

PE=mgh

where:

m = 10 kg is the mass of the block

g=9.8 m/s^2 is the acceleration due to gravity on Earth's surface

h = 5  m is the height of the object above the ground

Substituting, we find the potential energy:

PE=(10)(9.8)(5)=490 J

5)

The potential energy of the elevator is given by

PE=mgh

In this case, we have

h = 500 m (height of the elevator)

W = 1500 N (weight of the elevator)

We also know that the weight is the product of mass and acceleration due to gravity:

W=mg

So we can rewrite the first equation as

PE=Wh

And substituting, we find

PE=(1500)(500)=750,000 J

Learn more about potential energy:

brainly.com/question/1198647

brainly.com/question/10770261

#LearnwithBrainly

5 0
3 years ago
Which of the following would likely be the best reflector of heat energy
Alex73 [517]
If these are the missing choices: 
<span>A. gritty navy blue surface.
B. bumpy red surface.
C. dull orange surface.
D. Polished pale yellow surface.

My answer: D. Polished pale yellow surface

I read an article that summarized the results of the emission of radiation experiments. It stated the following:
1) </span>Black surfaces are the best emitters of heat radiation.
2) Black surfaces are the best absorbers of heat radiation.
3) Shiny surfaces are the best reflectors of heat radiation.
4) Shiny surfaces are poor absorbers of heat radiation.
<span>5) Glass will not transmit long wave infra red radiation.

Because of the above summary, that is why I arrived at the answer D. Polished pale yellow surface would likely be the best reflector of heat energy.</span>
4 0
3 years ago
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