Ask question

Ask question

All categories

3 years ago

13

A 15-kg ball is tossed up into the air. The ball is 2 meters off the ground traveling 4 m/s. What is the potential energy? A. 29

4 J B. 120 J C. 414 J D. 0

1 answer:

Sladkaya [172]3 years ago

7 0

Answer: 0j

Explanation:

At that point potential energy is zero and kinetic energy is maximum.. P. E=mgh=0

You might be interested in

Time-outs are ineffective because

maria [59]

I think the correct answer would be the child quietly sits until the timer goes off. It is ineffective because the child would be used to this process and would come to a time where he will not get something from it.Also, it would make a child feel isolated and alone which would affect hi self-esteem in a long run.

8 0

3 years ago

Read 2 more answers

A helicopter (m = 3250 kg) is cruising at a speed of 56.9 m/s atan altitude of 185 m. What is the total mechanical energy of the

taurus [48]

Answer:

The mechanical energy of the helicopter is $1.12\times 10^7\ J$ .

Explanation:

It is given that,

Mass of the helicopter, m = 3250 kg

Speed of the helicopter, v = 56.9 m/s

Position of the helicopter, h = 185 m

The energy possessed by an object due to its motion is called its kinetic energy. It is given by :

$E=\dfrac{1}{2}mv^2$

$E=\dfrac{1}{2}\times 3250\times (56.9)^2$

$E=5.26\times 10^6\ J$

The energy possessed by an object due to its position is called its potential energy. It is given by :

$E=mgh$

$E=3250\times 9.8\times 185$

$E=5.89\times 10^6\ J$

The sum of kinetic and potential energy is called mechanical energy of the system. It is given by :

$M=5.26\times 10^6+5.89\times 10^6$

$M=11.15\times 10^6\ J$

or

$M=1.12\times 10^7\ J$

So, the mechanical energy of the helicopter is $1.12\times 10^7\ J$ . Hence, this is the required solution.

6 0

3 years ago

What happens to light when it passes through a lens?

Novay_Z [31]

B. Light refracts as it passes through a lens.

The bending of a ray of light also occurs when light passes into and out of a glass lens. ... Because a convex lens can cause rays of light to converge, it can produce an image on a screen.

7 0

3 years ago

Read 2 more answers

A truck covers 40.0 m in 7.50 s while uniformly slowing down to a final velocity of 2.55 m/s. (a) Find the truck's original spee

iris [78.8K]

Answer:

(a) 8.117 (b) 0.742 $m/sec^2$

Explanation:

We have given distance s =40 m time t=7.5 sec

Final velocity v =2.55 m/sec

From the first equation of motion $v=u-at$ (negative sign because there is retrdation as the truck speed is slowing down )

So $2.55=u-7.5a$ --------------eqn 1

From the second equation of motion $s=ut-\frac{1}{2}at^2$ ( negative sign because there is retrdation as the truck speed is slowing down )

So $40=7.5u-0.5\times a\times 7.5^2$

$40=7.5u-28.125a$ ------------------eqn 2

On solving eqn1 and eqn 2

u=8.117 m/sec and a=-0.742 $m/sec^2$

7 0

3 years ago

Which of the following statements uses a connotative word to evoke the most negative feeling?

irga5000 [103]

I think it’ll be a or d

7 0

2 years ago

Read 2 more answers