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3 years ago

Not a question, but I need help on the last two questions I posted, preferably no links, please...

Physics

2 answers:

Andrei [34K]3 years ago

7 0

Answer:

ok...

Explanation:

Vadim26 [7]3 years ago

5 0

Answer:

ive gotten links for answers that really looked like a virus

Explanation:

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You slam on the brakes of your car in a panic and skid a distance X on a straight, level road. If you had been traveling half as

Mariulka [41]

Answer:

The required skidded distance would be one-forth of the distance skidded if the velocity of the car becomes half.

Explanation:

If ' $v_{0}$ ' be the velocity of the car where the brakes are slammed on and 'a' be the constant deceleration gained by the car before coming to stop after skidding a distance 'X' at time 't' where final velocity ' $v_{t} = 0$ ', then as can be seen from the figure,

$&& v_{t} = v_{0} - a~t\\&or,& 0 = v_{0} - a~t\\&or,& t = \dfrac{v_{0}}{a}$

If from any arbitrarily chosen point 'O', ' $x_{0}$ ' be the distance where the brakes are slammed on and ' $x_{t}$ ' be the distance from the same point 'O' where the car stops, then

$&& x_{t} = \int\limits^t_0 {v_{t}} \, dt\\ = \int\limits^t_0 ({v_{0} - a~t}) \, dt\\ = v_{0}~t - \dfrac{1}{2}~a~t^{2} + x_{0}\\\\&or,& x_{t} - x_{0} = v_{0}~t - \dfrac{1}{2}~a~t^{2}\\&or,& X = v_{0}~\dfrac{v_{0}}{a} - \dfrac{a}{2}(\dfrac{v_{0}}{a})^{2}\\&or,& X = \dfrac{v_{0}^{2}}{a}$

Now if the car would have been moving with a velocity ' $\dfrac{v_{0}}{2}$ ' and would have been skidding a distance 'Y', then from the above equation substituting the velocity we can have

$Y = \dfrac{X}{4}$

So, if the car were moving at half as fast under the same road conditions, it would have skidded by a distance which is one-forth of the present skidded distance.

7 0

3 years ago

What test were used to find out information about the iceman

Blababa [14]

To find information, the would take DNA tests.

6 0

3 years ago

2. True or false. As a wave travels through a given material its velocity changes.

laila [671]

Answer:

ture

Explanation:

6 0

3 years ago

At one particular moment, a 19.0 kg toboggan is moving over a horizontal surface of snow at 4.00 m/s. After 7.00 s have elapsed,

Lina20 [59]

Answer:

10.86 N

Explanation:

Let the average frictional force acting on the toboggan be 'f' N.

Given:

Mass of toboggan (m) = 19.0 kg

Initial velocity (u) = 4.00 m/s

Final velocity (v) = 0 m/s

Time for which friction acts (Δt) = 7.00 s

Now, change in momentum is given as:

$\Delta p =Final\ momentum-Initial\ momentum\\\\\Delta p=mv-mu\\\\\Delta p=19.0\ kg(0-4.00)\ m/s\\\\\Delta p=-76.00\ Ns$

Now, we know that, change in momentum is equal to the impulse acting on the body. So,

Impulse is, $J=\Delta p=-76.00\ Ns$

Now, we know that, impulse is also given as the product of average force and the time interval for which it acts. So,

$J=f\times \Delta t$

Rewriting the above equation in terms of 'f', we get:

$f=\dfrac{J}{\Delta t}$

Plug in the given values and solve for 'f'. This gives,

$f=\frac{-76.00\ Ns}{7.00\ s}\\\\f=-10.86\ N$

Therefore, the magnitude of frictional force is $|f|=|-10.86\ N|=10.86\ N$

3 0

3 years ago

While researching scuba diving, Pablo reads how hot a tank should get while being filled with air. Which law best explains why t

Lady_Fox [76]

Answer:

Gay-Lussac’s law, because as the pressure increases, the temperature increases

Explanation:

First of all, we can notice that the volume of the tank is fixed: this means that the volume of the air inside is also fixed.

This means that in this situation we can apply Gay-Lussac's law, which states that:

"for a gas kept at constant volume, the pressure of the gas is proportional to the absolute temperature of the gas".

Mathematically:

$p\propto T$

where p is the pressure in Pascal and T is the temperature in Kelvin.

In this case, the tank is filled with air: this means that the pressure of the gas inside the tank increases. And therefore, according to Gay-Lussac's law, the temperature will increase proportionally, and this explains why the tank gets hot.

5 0

3 years ago

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