How is velocity and instantaneous speed alike

1 answer:

5 0

<span>velocity is defined as the rate of change of displacement irrespective of the length of the path travelled while speed is the average rate of covering distance. but in the liming case where the instantaneous velocity is given as v=dx/dt where dx is the small displacement in a small interval dt, both the speed and velocity have the same magnitude and the direction of velocity is the direction of the tangent to the corresponding displacement-time curve.</span>

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How can you increase the magnitude of friction between two surfaces ? How can you decrease the magnitude of friction

Mice21 [21]

The frictional force between two surfaces is given by:
$F_f = \mu F_p$
where
$\mu$ is the coefficienct of friction
$F_p$ is the force with which one surface is pushed against the other one

Looking at the formula, we see that there are two possible ways to increase the friction:
1) by increasing the coefficient of friction $\mu$ (for instance, by making the surfaces more "rough"
2) by increasing $F_p$ , the force with which one surface is pushed against the other

Similarly, in order to decrease the friction, the two possible ways are:
1) by reducing the coefficient of friction
2) by reducing the force $F_p$

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OLEGan [10]

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Allisa [31]

Answer:

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Consider the free-body diagram. If you want the box to move, the force applied while dragging must be greater than the

In-s [12.5K]

the answer to this qustion is c friction force

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A girl during a hike has a bottle of mineral water in her haversack. The bottle has 2 litres of water in it (2ltr. weigh 2kg). T

balu736 [363]

Answer:

Q = 41800[J]

Explanation:

These types of problems can be solved using the following heat transfer equation for quarps that increase or decrease their temperature as a function of mass.

$Q=m*C_{p}*DT$

where:

Q = Heat absorbed [J]

m = mass = 2 [kg]

DT = temperature change = 5 [°C]

Cp = specific heat of the water = 4180 [J/kg*°C]

$Q=2*4180*5\\Q=41800[J]$

Units of energy (Joules) [J]

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