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3 years ago

Hello:)! I don’t really understand the uniform deceleration too :/

Physics

1 answer:

NARA [144]3 years ago

4 0

Answer:

Deceleration is the opposite of acceleration.

The mathematical formula for deceleration is:

$Deceleration = \frac{Final velocity - Initial velocity}{Time taken}$

Uniform deceleration of an object can be defined as decreasing the velocity of an object in equal amount in an equal interval of time.

The graph attached below shows a constant decrease in the velocity with a uniform time interval.

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A 790N person runs up a flight of 40 stairs (.25m for each step) in 20 seconds, and then down 10 steps in 5 seconds. How much to

Romashka [77]

A person runs up 40 stairs and then come down 10 steps

So total stairs upwards is given as

$N = 40 - 10 = 30$

now here we will have total height reached

$H = N\times h$

$H = 30 \times 0.25 = 7.5 m$

Now total energy used or mechanical work done is

$W = mgH$

$W = 790 \times 7.5 = 5925 J$

Now the mechanical power is given as

$P = \frac{W}{t}$

$P = \frac{5925}{20+ 5} = 237 W$

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3 years ago

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kakasveta [241]

Can you elaborate more on the question please

3 0

3 years ago

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Explain briefly where the energy come from when a liquid Rises against Gravity in a capillary tube

SSSSS [86.1K]

Answer:

Surface tension

Explanation:

When liquid rises against gravity in a capillary tube, the energy comes from surface tension.

This is because surface tension is the energy that's needed to increase the liquid surface area.

As a result of hydrogen bonding present in Water, it usually has high surface tension which makes it to possess a tough skin that can make it not to break despite high forces applied to it.

The liquid will be in contact with the capillary tube and as such experiences surface tension which in turn makes the capillary tube to experience an upward force that makes the liquid begin to rise up.

The more the liquid keeps rising, the more it gets to the point where the surface tension becomes balanced from the weight of the liquid.

3 0

3 years ago

A 26.0 g ball is fired horizontally with initial speed v0 toward a 110 g ball that is hanging motionless from a 1.10 m -long str

mart [117]

Answer:

$7.3 ms^{-1}$

Explanation:

Consider the motion of the ball attached to string.

In triangle ABD

$Cos50 = \frac{AB}{AD} \\Cos50 = \frac{AB}{L}\\AB = L Cos50$

height gained by the ball is given as

$h = BC = AC - AD \\h = L - L Cos50\\h = 1.10 - 1.10 Cos50\\h = 0.393 m$

$M$ = mass of the ball attached to string = 110 g

$V$ = speed of the ball attached to string just after collision

Using conservation of energy

Potential energy gained = Kinetic energy lost

$Mgh = (0.5) M V^{2} \\V = sqrt(2gh)\\V = sqrt(2(9.8)(0.393))\\V = 2.8 ms^{-1}$

Consider the collision between the two balls

$m$ = mass of the ball fired = 26 g

$v_{o}$ = initial velocity of ball fired before collision = ?

$v_{f}$ = final velocity of ball fired after collision = ?

using conservation of momentum

$m v_{o} = MV + m v_{f}\\26 v_{o} = (110)(2.8) + 26 v_{f}\\v_{f} = v_{o} - 11.85$

Using conservation of kinetic energy

$m v_{o}^{2} = MV^{2} + m v_{f}^{2} \\26 v_{o}^{2} = 110 (2.8)^{2} + 26 (v_{o} - 11.85)^{2} \\v_{o} = 7.3 ms^{-1}$

3 0

3 years ago

Billy and Bob want to know if the amount of baking soda added to vinegar will affect the height a rocket will launch. They will

Tatiana [17]

Answer:

hypothesis: Billy and Bob want to know if the amount of baking soda added to vinegar will affect the height a rocket will launch. They will measure the height of the rocket launch in meters

Explanation:

6 0

3 years ago

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