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3 years ago

Wil-E-Coyote drops a bowling ball off a cliff to try to catch the Roadrunner. The cliff is

Physics

1 answer:

PtichkaEL [24]3 years ago

8 0

Answer:

t = 5.19 s

Explanation:

We have,

Height of the cliff is 132 m

It is required to find the time taken by the ball to fall to the ground. Let t is the time taken. So, using equation of kinematics as :

$y=ut+\dfrac{1}{2}gt^2\\\\\text{since}\ u=0\\\\y=\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{2y}{g}}\\\\t=\sqrt{\dfrac{2\times 132}{9.8}}\\\\t=5.19\ s$

So, it will take 5.19 seconds to fall to the ground.

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A cannon fires a shell straight upward; 1.8 s after it is launched, the shell is moving upward with a speed of 17 m/s. Assuming

goblinko [34]

To solve this problem we will apply the concepts of acceleration according to the laws of kinetics. Acceleration can be defined as the change in velocity per unit time, that is,

$a = \frac{v-u}{t}$

Here,

v = Final velocity

u = Initial velocity

t = Time

Rearranging to find the initial velocity,

$u = v-at$

Now the acceleration is equal to the gravity, then,

$u = v+gt$

$u = 17+(9.8)(1.8)$

$u = 34.64m/s$

The velocity of the shell at 5.5s after the launch is,

$v = u+at$

$v = u-gt$

$v = 34.64-(9.8)(5.5)$

$v = -19.26m/s$

Therefore the magnitude of the velocity of the shell at 5.5s is -19.26m/s

5 0

3 years ago

What two elements are named after Dimitri Mendeleev?

bezimeni [28]

I'm pretty sure there is only one element named after Mendeleev: <span>Mendelevium.</span>

8 0

3 years ago

Read 2 more answers

A mineral has a mas of 53grams. Its volume is 12millileters. What is the<br> density?

polet [3.4K]

Answer:

636

Explanation:

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3 years ago

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Simon is riding a bike at 12 km/h away from his friend Keesha. He throws a ball at 5 km/h back to Keesha, who is standing still

pychu [463]

So there are different ways this could be solved. I'll do try to explain it the way I was taught...

Simon is riding his bike at 12 km/hr relative to the sidewalk, away from where Keesha is.

Simon throws the ball at Keesha, at 5 km/hr.

Keesha sees the ball approaching her at (12-5) = 7 km/hr relative to the ground to her.

Therefore the answer is: 7 km/hr

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3 years ago

An elephant pushes with 2000 N on a load of trees. It then pushes these trees for 150 m. How much work did the elephant d

LiRa [457]

Answer:

300000

Explanation:

2000×150= 300000

6 0

3 years ago