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anygoal [31]
3 years ago
14

A cat weighing 5kg is climbing at the top of a tree and has potential energy at 1176kg. Find the height of the tree

Physics
1 answer:
STALIN [3.7K]3 years ago
5 0

Answer:

23.9m

Explanation:

step one:

This problem is on energy.

we can proceed by using the expression for potential energy to solve for height h

we know that

PE=mgh

given that

mass m= 5kg

PE= 1176 joules

step two:

we can substitute our data and find h

1176= 5*9.81*h

1176=49.05h

step three:

divide both sides by 49.05 we have

1176/49.05=h

h=23.9 m

The height of the tree is 23.9m

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The driver of a car going 96.0 km/h suddenly sees the lights of a barrier 39.0 m ahead. It takes the driver 0.75 s to apply the
arsen [322]

Answer:

21.42m/S

Explanation:

Hello!

To solve this problem we must perform the following steps.

1. Find the distance traveled from until the driver reacts, this is achieved using the equation for constant speed movement.

X1=VT

where

x= distance traveled

v=initial speed

T=time=0.75s

X1=0.75Vo

we must take into account that the total distance is the sum of the distance at which the pilot reacts (x1) and when it starts to decelerate (x2)

39=0.75Vo+X2

X2=39-0.75Vo

2. Now we use the equation that defines a movement with constant acceleration.

Vo =\sqrt{Vf^2 - 2(a)(x2)}

where

Vf = final speed=0m/s

Vo = Initial speed

A = acceleration =-10m/s2

X2 = displacement

now we use the ecuation of step 1

Vo =\sqrt{Vf^2 - 2(a)(39-0.75Vo)}

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Vo =\sqrt{0 - 2(-10))(39-0.75Vo)}\\Vo^2=780-15Vo\\Vo^2+15Vo-780=0

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