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AlekseyPX
3 years ago
8

What is true about coal as an energy source

Physics
1 answer:
seropon [69]3 years ago
6 0
Nonrenewable............................
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A block has a volume of 0.09 m3 and a density of 4,000 kg/m3. What's the force of gravity acting on the block in water?
NeX [460]
If one m³ of that material holds 4,000 kg of it,
then 0.09 m³ holds

(0.09) x (4,000) = 360 kg of it

The force of gravity acting on 360 kg of anything
on the Earth's surface is

(mass) x (gravity)

= (360 kg) x (9.8 m/s²) = 3,528
5 0
4 years ago
As you drive in your car at 22.5 mi/h, you see a child’s ball roll into the street ahead of you. You hit the brakes and stop as
evablogger [386]

Answer:

Explanation:

Speed of car =22.5miles/hr

U=22.5miles/hour

Applied brake and come to rest

Final velocity, =0

t, =2sec

Given that,

Speed=distance /time

Then,

Distance, =speed, ×time

Converting mile/hour to m/s

Given that

Use: 1 mile= 1600 m, 1 h= 3600s

22.5miles/hour × 1600m/mile × 1hour/3600s

Therefore, 22.5mile/hour=10m/s

Using speed =10m/s

Distance =speed ×time

Distance=10×2

Distance, =20m

The distance travelled before coming to rest is 20m.

5 0
3 years ago
Which list places different units of matter in the correct sequence from smaller to largest
Alex Ar [27]

Answer:

D. Protons, atoms, rock particles, bricks, buildings

Explanation:

7 0
3 years ago
Read 2 more answers
The object of badminton is to hit the birdie or "shuttlecock" over the net and onto to court to score how many points to win gam
xxTIMURxx [149]

Answer:

either 7 or 21

Explanation:

6 0
3 years ago
A 3.70 kg block moving 2.09 m/s right hits a 2.42 kg block moving 3.92 m/s left. Find the total momentum of the system.
Novosadov [1.4K]

Answer:

-1.7534 Kg.m/s

Explanation:

Momentum, p is a product of mass and velocity, expressed as p= mv where m is the mass and v is the velocity which is dependent on the direction. Taking left as negative and right as positive then the initial momentum will be

p=-2.42*3.92+(3.7*2.09)=-1.7534 Kg.m/s

5 0
3 years ago
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