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1 year ago

Sketch a position-time graph for a bear starting

Physics

1 answer:

Dmitrij [34]1 year ago

3 0

Explanation:

hopefully that makes sense. the position doesn't change over the 5 seconds, meaning it's stopped but time still continues. then when the slope is negative this shows the bear's position becoming negative (backing up, changing direction).

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An airliner of mass 1.70×105kg1.70×105kg lands at a speed of 75.0 m/sm/s. As it travels along the runway, the combined effects o

Karo-lina-s [1.5K]

Answer:

The airliner travels 1.65 km along the runway before coming to a halt.

Explanation:

Given

Resistive forces = (2.90 × 10⁵) N = 290000 N

Mass of the airliner = (1.70 × 10⁵) kg = 170000 kg

Velocity of airliner = 75 m/s

Let the distance over moved by the airliner be equal to d

According to the work-energy theorem, the work done by the resistive forces in stopping the airliner is equal to the travelling kinetic energy of the airliner.

Work done by the resistive forces = (290000) × d = (290,000d) J

Kinetic energy of the airliner = (1/2)(170000)(75²) = 478,125,000 J

290000d = 478,125,000

d = (478,125,000/290,000)

d = 1648.7 m = 1.65 km

Hope this helps!!!

4 0

1 year ago

Two students, sitting on frictionless carts, push against each other. Both are initially at rest and the mass of student 1 and t

Zepler [3.9K]

Answer:

v₂ = v/1.5= 0.667 v

Explanation:

For this exercise we will use the conservation of the moment, for this we will define a system formed by the two students and the cars, for this isolated system the forces during the contact are internal, therefore the moment conserves.

Initial moment before pushing

p₀ = 0

Final moment after they have been pushed

$p_{f}$ = m₁ v₁ + m₂ v₂

p₀ = $p_{f}$

0 = m₁ v₁ + m₂ v₂

m₁ v₁ = - m₂ v₂

Let's replace

M (-v) = -1.5M v₂

v₂ = v / 1.5

v₂ = 0.667 v

6 0

1 year ago

Imagine that you replace the block in the video with a happy or sad ball identical to the one used as a pendulum, so that the sa

gizmo_the_mogwai [7]

Answer: a) The Answer to the question is option a) None of it.

Explanation:

The reason is because according to the law of conservation of energy Energy can neither be created nor destroyed but can be transformed from one form to the other. Therefore none of the kinetic energy was dissipated, rather it was transformed to another form of energy.

6 0

1 year ago

A force of 20N changes the position of a body. If mass of the body is 2kg, find the acceleration produced in the body.2. A ball

shepuryov [24]

Explanation:

Hello there!!!

You just need to use simple formula for force and momentum, 

F= m.a

and momentum (p)= m.v

where m= mass

v= velocity.

a= acceleration .

And the solutions are in pictures. 

Hope it helps..

5 0

1 year ago

When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in mome

photoshop1234 [79]

B The change in momentum stays the same because the ball still comes to a stop.

3 0

1 year ago

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