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4 years ago

Which of the following describes a referee's job?

Physics

1 answer:

Serhud [2]4 years ago

5 0

Answer:

C. Supervising the game to make sure teams are playing fairly

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A motorcycle moving 18.8 m/s has<br> 57800 J of KE. What is its mass?

Brums [2.3K]

Answer:

m = 327.07 kg

Explanation:

Given that,

Kinetic energy of a motorcycle, E = 57800 J

Velocity of the motorcycle, v = 18.8 m/s

We need to find the mass of the motorcycle. The kinetic energy of an object is given by :

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

m is mass

$m=\dfrac{2E}{v^2}\\\\m=\dfrac{2\times 57800 }{(18.8)^2}\\\\m=327.07\ kg$

So, the mass of the motorcycle is 327.07 kg.

8 0

3 years ago

If the temperature of a piece of steel decreases, what happens to its density? (1 point)

zlopas [31]

As temperature decreases, the steel will contract (volume decreases) thereby, an increase in Density.

3 0

3 years ago

Read 2 more answers

organize these by 1 being the most and 16 being the least thing and by need if you were stranded on a deserted island

ElenaW [278]

Answer:

1.knife

2.flashlight

3.batteries for flashlight

4.flares

5.matches

###### sorry UwU

7.first aid

8.12 foot plastic tarp

9.iphone

6 0

3 years ago

I will be so thankful if u answer correctly!!

polet [3.4K]

Explanation:

The acceleration due to gravity on earth $g_{E}$ is given by

$g_{E} = G\dfrac{M_{E}}{R_{E}^{2}}$

where $G$ = universal gravitational constant

$\:\:\:\:\:\:\:\:\:\:\:\:M_{R}$ = mass of the earth

$\:\:\:\:\:\:\:\:\:\:\:\:R_{E}$ = radius of the earth

Planet Krypton has twice the mass of earth and 3 times the radius so its acceleration due to gravity $g_{K}$ is

$g_{K} = G\dfrac{M_{K}}{R_{K}^{2}}$

$\:\:\:\:\:\: = G\dfrac{(2M_{E})}{(3R_{E})^{2}}$

$\:\:\:\:\;\:= (\dfrac{2}{9})G\dfrac{M_{E}}{R_{E}^{2}}$

$g_{K} = (\dfrac{2}{9})\:g_{E}$

If we multiply both sides by Superman's mass, we get his weights on both planets:

$mg_{K} = (\dfrac{2}{9})\:(mg_{E})$

$W_{K} = (\dfrac{2}{9})\:W_{E} = (\dfrac{2}{9})(900\:N)= 200\:N$

3 0

3 years ago

What is the change in momentum of a 0.18 kg arrow that is traveling at 100 m/s and is stopped by a hay

Kryger [21]

The 2 seconds part isn’t relèvent to the question.
So momentum = mass x velocity
So 0.18 x 100 = 18

3 0

3 years ago