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3 years ago

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How does the force required to lift an object in water compare to the force needed to lift the same object on land?it is the exa

ctly the same for the same object.it can be either greater or less, depending on the object.it is more.it is less.

1 answer:

padilas [110]3 years ago

8 0

It takes less force to lift the object in the water than on land, since the water is helping with the weight of the object.

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kozerog [31]

Newton's second equation of motion :-

S=ut+1/2at^2 [where, u is the initial velocity, a is the acceleration and t is the time interval]

This Equation simply finds a relation between distance travelled by a particle (classically) under uniform acceleration.

So let's see what pieces of information (bundles of equations) do we have with us, initially.

We have, a very primary equation with us,

dS/dt = v… (I)

(Considering motion in a straight line only)

And we also have the equation

dv/dt = a…(II)

Simply replacing the v in eqn (II) by eqn (I), we find

d2S/dt^2 = a…(III)

This is what we need to solve. It's easy.

You know,

d2S/dt^2 = d/dt(dS/dt) = a

⟹ dS/dt = ∫adt = at+c1

Since, dS/dt is the velocity of the particle,

Therefore, at t = 0, dS/dt|t = 0 = u

⟹ u = a∗0 + c1 = c1

⟹ c1 = u

Therefore, dS/dt = u + at

Thus, S = ∫(udt + atdt)

⟹ S = ut + 1/2at^2 +c^2

If say, the particle is already having a displacement S0 the moment you start measuring it's motion. Then, at t = 0, S = S0

This makes S = S0 +ut + 1/2at^2

Since, in most of the practical cases, we start measuring a motion when the particle starts displacing (i.e., when S0=0 ),

We get

S = ut + 1/2at^2

Hope it helps :)

5 0

3 years ago

Calculate the magnitude of the force, in newtons, exerted by a boxing glove on an opponent’s face, if the glove and face togethe

saul85 [17]

Answer:

5437.5 N

Explanation:

from the question we are given the following:

mass = 7.25 kg

initial speed (u) = 10.5 $\frac{m}{s}$

finial velocity (v) = 0

compression (s) = -7.35 cm = -0.0735 m (the negative sign is because the face is compressed, so there is a decrease)

we know that force = mass x acceleration,

we have our mass but need to find the acceleration. we can get the acceleration by applying the formula below

$v^{2} = u^{2} + 2as$

therefore

0 = 10.5^{2} + (-2)× a × 0.0735[/tex]

a = $\frac{10.5^{2} }{ 2 × 0.0735$ }[/tex]

a = 750

from F = m x a

force = 7.25 x 750 = 5437.5 N

7 0

4 years ago

Which two options describe physical properties of matter?

Elina [12.6K]

Answer:

D, B

Explanation:

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3 years ago

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I am an animal named after the animal that I eat, what am I?

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4 years ago

Kristina wants to paint the living room a bright blue. Maya prefers the dark blue paint. In other words, they disagree about the

Kruka [31]

Answer:

Intensity

Explanation:

Intensity basically means the amount of light. Hence, they are arguing about the amount of light that one color reflects more than another.

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4 years ago

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