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Tema [17]
3 years ago
13

In ancient wars, heavy rocks are thrown horizontally from the wall as weapons. f the initial speed of a rock is 3 m/s , how many

meters will it travel horizontally from a wall 25 meters abov the ground after 2 seconds(neglect air resistance, g=9.8m/s2)
Physics
1 answer:
mojhsa [17]3 years ago
8 0

Answer:

The horizontal distance traveled by the rock from the wall after 2 seconds is 6m.

Explanation:

Given;

initial speed of the rock, u = 3 m/s

height of the wall, h = 25 m

time of travel, t = 2 seconds

The horizontal distance is determined as follows;

X = ut + ¹/₂gt²

where;

g is acceleration due to gravity, horizontal distance is not affected by gravity, g = 0

X = ut

X = 3 x 2

X = 6 m

Therefore, the horizontal distance traveled by the rock from the wall after 2 seconds is 6m.

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A person stands on level ground with both feet equidistant from each other directly under their shoulders. In this case, the nor
d1i1m1o1n [39]

Answer:

The correct option is C: the normal force of gravity on each foot is equal to 1/2 the force of gravity on the person.

Explanation:

Since the feet are equidistant from each other, the total torque is zero:

\Sigma \tau = 0      

And the total forces acting on the feet are also equal to zero:

\Sigma F = 0

Hence, the normal force on the feet are:

W = N_{1} + N_{2}          

Where:                  

W: is the weight force

N₁: is the normal force of foot 1

N₂: is the normal force of foot 2

Since the normal force of each foot is the same, we have that N₁ = N₂ so:

W = 2N        

N = \frac{W}{2}   (1)

From the result of equation (1), we have that the normal force on each foot is equal to 1/2 the force of gravity on the person.

   

Therefore, the correct option is C: the normal force on each foot is equal to 1/2 the force of gravity on the person.                                                                        

I hope it helps you!

4 0
3 years ago
Alkaline batteries have the advantage of putting out constant voltage until very nearly the end of their life. How long will an
Sidana [21]

Answer:

Explanation:

Voltage, V = 1.58 V

Power, P = 1 W

1 A.h

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1 x t = 1.58 x 3600

t = 1.58 x 3600 second

t = 1.58 hours

8 0
4 years ago
What is the weight in pounds of a 7.0 kilogram bowling ball on earth's surface
hodyreva [135]

Gravitational field strength (GFS) on earth =10 N/kg

Weight = GFS x mass
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3 0
3 years ago
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Answer:

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3 years ago
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svetoff [14.1K]
Impulse describes the change of momentum. Since we don't know the momentum of the soccer ball before the hit, this question is hard to answer. If you assume the momentum of the ball before the hit was p = 0, then the change in momentum is just Δp = Impulse = mv.
7 0
3 years ago
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