3 years ago

Please i need answer for part d

Physics

1 answer:

matrenka [14]3 years ago

4 0

It is c that’s what it is that’s the answer

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A 75kg man goes up a tower 30 m in 120s. How much power did the man exert

Pepsi [2]

Explanation:

If g= 10m/s²

Then 75kg=75×10=750N

Since Work =Force ×Distance

Work=750×30

=22500J

And Power°=Work÷time

=22500÷120

=187.5W

8 0

3 years ago

(c)

lys-0071 [83]

The answer is c. Twelve wants pass an obsessive frequency of the internet

7 0

4 years ago

3. If a pipe with flowing water has a cross-sectional area nine times greater at point 2 than at point 1, what would be the rela

shusha [124]

Answer:

The velocity of the flow at point 1 is nine times greater than the velocity at point 2.

Explanation:

We know that the same volume of water entering through point 1 must exit through point 2.

The volume of water per unit of time or the volumetric flow is defined by:

$V_{flow}=v*A\\ where:\\V_{flow}= flow [m^3/s]\\v=velocity[m/s]\\A=area [m^2]$

If $A_{2}=9*A_{1} \\$

therefore

$v_{1} *A_{1} = v_{2} *A_{2} \\v_{1} *A_{1} = v_{2} *9A_{1} \\\\v_{1} = 9v_{2} \\$

4 0

4 years ago

An angry mob lynches a phsical teacher after receiving their grades. They throw the physics teacher off a tall building . They t

babunello [35]

Answer:

5010 m

Explanation:

The vertical position of the teacher at time t can be found by using the equation:

$y(t) = h + ut+ \frac{1}{2}gt^2$

where

h is the initial height

$u = -20 m/s$ is the initial velocity (negative since it's downward)

$g=-9.8 m/s^2$ is the acceleration of gravity

t is the time

The teacher reaches the ground when y = 0, so the equation becomes

$h=-ut-\frac{1}{2}gt^2$

Substituting t = 30 s, we find the initial height:

$h=-(-20)(30)-\frac{1}{2}(-9.8)(30)^2=5010 m$

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3 years ago

In a perfectly inelastic one-dimensional collision between two objects, what condition alone is necessary so that the final kine

Crank

<span>The condition alone that is necessary so that the final kinetic energy of the system is zero after the collision is that the objects must have momenta with the same magnitude but opposite directions.</span>

5 0

3 years ago

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