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2 years ago

7

Kindly AnswerPhysics

1 answer:

pshichka [43]2 years ago

4 0

Answer:

1. d 2. a 3. a 4. a 5. a

Explanation:

Sorry if this is wrong

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Newton's third law states that for every action force there is an equal and opposite reaction force. An idiot in your class says

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A. Because the third laws say that for every action force the is an equal and opposite reaction force

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A student practicing for a cross country meet runs 250 m in 30 s. What is her average speed?

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2 years ago

A family car has a mass of 1400 kg. In an accident it hits a wall and goes from a speed of 27 m/s to a standstill in 1.5 seconds

horrorfan [7]

Answer:

The force has been reduced by 8018 N

Explanation:

The impulse exerted on the car during the crash is equal to the product of the force exerted and the duration of the collision, and it is also equal to the change in momentum of the car. So we can write:

$F\Delta t = m\Delta v$

where:

F is the force exerted on the car

$\Delta t$ is the duration of the collision

m = 1400 kg is the mass of the car

$\Delta v=-27 m/s$ is the change in velocity of the car

We can re-write the equation as

$F=\frac{m\Delta v}{\Delta t}$

In the 1st collision, the time is 1.5 seconds, so the force is

$F_1=\frac{(1400)(-27)}{1.5}=-25,200 N$

In the 2nd collision, the time is increased to 2.2 seconds, so the force is

$F_2=\frac{(1400)(-27)}{2.2}=-17,182 N$

Therefore, the force has been reduced by:

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3 years ago

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Work done depends on

natima [27]

Answer:

C. Both force and displacement

Explanation:

Hope this helps

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2 years ago