3 years ago

If a ball has kinetic energy of 1000 joules and a speed of 5m/s, what is its mass?

Physics

1 answer:

pogonyaev3 years ago

8 0

Answer:

m = 80[kg]

Explanation:

The kinetic energy can be calculated by means of the following equation.

$E_{k}=\frac{1}{2}*m*v^{2}$

where:

m = mass [kg]

v = velocity = 5 [m/s]

Ek = kinetic energy = 1000 [J]

Now replacing:

$1000 = \frac{1}{2} *m*5^{2}\\2000 = 25*m\\m=80[kg]$

You might be interested in

What happens to the kinetic energy of a roller coaster as it approaches its lowest point and loses its potential energy?

Fiesta28 [93]

Answer:

At the top of the roller coaster, there is a lot of potential energy. When it comes to the bottom, the roller coaster loses its potential energy and gains kinetic energy as it is going very fast here.

3 0

3 years ago

Which type of rock commonly contains fossils? A. sedimentary B. igneous C. metamorphic D. plutonic

Komok [63]

Answer:

A. Sedimentary

Explanation:

I took the test and got this correct. Hopefully this helps you!

3 0

4 years ago

A ventilating fan is operated by 0.5hp electric motor. How much work in joules can the fan do in 3 hours? (I need the answer asa

shtirl [24]

Answer:

Power= 0.5hp = 375W

T = 3hrs = 10800s

Power = Work done/ Time

Work = Power * Time = 375 * 10800 = 4050000J

3 0

3 years ago

A wheel has a radius of 5.9 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an

posledela

Answer:

(a). The path length is 3.09 m at 30°.

(b). The path length is 188.4 m at 30 rad.

(c). The path length is 1111.5 m at 30 rev.

Explanation:

Given that,

Radius = 5.9 m

(a). Angle $\theta=30°$

We need to calculate the angle in radian

$\theta=30\times\dfrac{\pi}{180}$

$\theta=0.523\ rad$

We need to calculate the path length

Using formula of path length

$Path\ length =angle\times radius$

$Path\ length=0.523\times5.9$

$Path\ length =3.09\ m$

(b). Angle = 30 rad

We need to calculate the path length

$Path\ length=30\times5.9$

$Path\ length=177\ m$

(c). Angle = 30 rev

We need to calculate the angle in rad

$\theta=30\times2\pi$

$\theta=188.4\ rad$

We need to calculate the path length

$Path\ length=188.4\times5.9$

$Path\ length =1111.56\ m$

Hence, (a). The path length is 3.09 m at 30°.

(b). The path length is 188.4 m at 30 rad.

(c). The path length is 1111.5 m at 30 rev.

8 0

3 years ago

Which element has an atomic number of 9 and an atomic mass of 19?

yan [13]

Answer:

fluorine

Explanation:

3 0

3 years ago

Read 2 more answers