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Salsk061 [2.6K]
3 years ago
5

two bumper cars at an amusement park collide together abd get stuck together. assuming that the system of the two bumper cars is

isolated. what does the conservation of momentum tell us
Physics
1 answer:
Fiesta28 [93]3 years ago
7 0

The answer to this problem is M1v1-m2v2=(m1+m2)v

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Which of the following energy resources produces greenhouse gases?
Blizzard [7]
Coal is burned to get energy. By burning coal, green houses gases like carbon dioxide, nitrogen oxides and suphur oxides are produced.

Rest of the energy sources given in the option are clean energies.

Answer is A.
4 0
3 years ago
a skydiver jumps out of a plane. describe how gravitational potential energy changes as the skydiver falls. describe how the sky
Oliga [24]

gravitational potential is directly proportional to the height of the object relative to a reference line and is given as

PE = mgh                        

where m = mass of object , g = acceleration due to                    

gravity   and  h = height of the object above the reference line .


as the skydiver falls , its height above the ground decrease and hence the gravitational potential energy of the skydiver decrease.

as per conservation of energy , total energy of the skydiver must remain constant all the time . hence the decrease in potential energy appears as increase in kinetic energy by same amount to keep the total energy constant

KE + PE = Total energy

so as the skydiver falls , it gains speed and hence the kinetic energy of skydiver increase since kinetic energy is directly proportional to the square of the speed.


when the parachute opens, the skydiver experience force in upward which tries to balance the weight of the skydiver. hence the speed of the skydiver decrease until upward force becomes equal to the downward force. hence the kinetic energy decrease just after the parachute opens

4 0
3 years ago
True or False: Every lightning strike produces thunder.
amid [387]

<u>False, </u>

<u>True,</u>

A build up of positive charge builds up on the ground under  the cloud, attracted to the negative charge in the cloud. The earth's positive charge concentrates to anything that sticks up - trees, lightning conductors,

<u>100</u>

8 0
3 years ago
Which of the following substances could be heated from 20°C to 100°C most quickly? Assume identical heat sources are used on all
Lera25 [3.4K]
Hello There!

Your answer is Gold because it has the lowest SH

Hope This Helps You!
Good Luck :) 

- Hannah ❤
3 0
2 years ago
Read 2 more answers
A projectile is shot on level ground with a
erastova [34]

Answer:

time rising = 34 / 9.8 = 3.47 sec

total time in air = 2 * 3.47 sec = 6.94 sec

(time rising must equal time falling)

R = 17 m/s * 6.94 s = 118 m

Can also use range formula

R = v^2 sin (2 theta) / g

tan theta = 34 / 17 = 2

theta = 63.4 deg

2 theta = 126.9 deg

sin 126.9 = .8

v^2 = 17^2 + 34^2 = 1445 m^2/s^2

R = 1445 * .8 / 9.8 = 118 m    agreeing with answer found above

5 0
2 years ago
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