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3 years ago

When you jump over something is it a balanced force?

Physics

1 answer:

Marta_Voda [28]3 years ago

8 0

Answer:

no..

Explanation:

in balanced force it will or in this case u would stay still or u would move at the same speed.. but when u jumps the speed changes..so this is an unbalanced force

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How does the sun get its power? In which region of the sun does this process occur?

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The sun gets its power from nuclear fusion. In the suns core.

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3 years ago

While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 61 kg person devel

liraira [26]

Answer:

2.66m/s

Explanation:

information we have

power: 65W

work per step per kilogram: 0.60J

mass: 61kg

length of a running step: 1.5m

---------------

the formula for power is:

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

where W is the work and t is time.

time is also defined as: $t=\frac{distance}{velocity}=\frac{d}{v}$

so substituting this into the formula for power we get:

$P=\frac{W*v}{d}$

where v is the velocity we are looking for, d is the distance per step: $d=1.5m$ , W is the work per step and P is power $P=65W$ .

we know that the work per step per kilogram is:

0.60J

so to find the work per step of his whole body we need to multiply the 0.60J by the 61 kilograms of his mas:

$W=0.60J*61kg\\W=36.6J$ this is the work per step of the person.

So now we can calculate the velocity using the formula for power

$P=\frac{W*v}{d}$

clearing for v:

$v=\frac{P*d}{W}\\$

and substituting known values:

$v=\frac{(65W)(1.5m)}{36.6J}= 2.66m/s$

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3 years ago

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What is the acceleration so due to gravity and horizontal force the acceleration will be A

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3 years ago

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pentagon [3]

Answer:

$\theta = 67.22 degree$

Explanation:

Let say the ball is projected at an angle with horizontal

So here two components of the velocity of the ball is given as

$v_x = 8.15 cos\theta$

$v_y = 8.15 sin\theta$

now the displacement in x direction is given as

$x = v_x t$

$4.57 = (8.15 cos\theta)t$

in y direction it is given as

$y = y_o + v_y t - \frac{1}{2}gt^2$

$3.05 = 2.44 + (8.15 sin\theta) t - 4.9 t^2$

now from above two equations

$0.61 = 4.57 tan\theta - 4.9(\frac{4.57}{8.15 cos\theta})^2$

$0.61 = 4.57 tan\theta - 1.54(1 + tan^2\theta)$

$1.54 tan^2\theta - 4.57 tan\theta + 2.15 = 0$

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3 years ago

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Answer:

A principle stating that energy cannot be created or destroyed, but can be altered from one form to another.

Explanation:

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2 years ago