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slamgirl [31]
3 years ago
8

How do you know if the net momentum is conserved

Physics
1 answer:
aleksklad [387]3 years ago
7 0

Answer:

net momentum is conserved if there is no external force involved in the system

Explanation:

we know that \frac{dP}{dt} = F

if F= 0 .we have \frac{dP}{dt} =0o it means that P remains constant if F=0.

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A small metal sphere has a mass of 0.16 g and a charge of -23.0 nC . It is 10 cm directly above an identical sphere with the sam
Hoochie [10]

Explanation:

A) we know that the magnitude of force

F= \frac{kq_1q_2}{d^2}

F= \frac{9\times10^9\times23\times10^{-9}\times23\times10^{-9}}{0.1^2

= 4.761×10^{-4} N

Also, net force = gravitational force - electrostatic force

B) F_net = F_g - F_e

m×a = m×g - 4.761×10^-4

a = g - 4.761×10^{-4}÷m

a= 9.8 - (4.761×10^{-4} /0.16×10^{-3})

a= 9.8 -2.975625

a= 6.82 m/s

8 0
3 years ago
A car travels at 40 km/h for 2 h and 60 km/h for 3 hr. What is its average speed?
Vadim26 [7]

ive been doing this type of stuff in my class.

so to find this you need to first:

multiply 40 * 2

and multiply 60 * 3

= 80

= 180

add 180 + 80 = 260

add the time together so 2 + 3 is 5

divide 260 / 5 = with an answer of 52km/h


i hope this helps, if incorrect or mis proper answer let me know :)


-wolfs

7 0
3 years ago
Two 100 kg bumper cars are moving toward each other in opposite directions. Car A is moving at 8 m/s and Car Bat -10 m/s when th
tatiyna

Answer:

b) -10 m/s

Explanation:

In perfectly elastic head on collisions of identical masses, the velocities are exchanged with one another.

3 0
3 years ago
How often is water added to the Earth system?
rosijanka [135]
<span>Water is never added to earth system. Water forever remains in the water cycle on earth, so it goes from the ground, to the air, to the rain, to the sea, and round and round continuously. This cycle means that there does not need to be new water added to the earth, because it recycles any water that already exists of its own accord.</span>
4 0
4 years ago
Will give Brainliest!! Question attached.
ss7ja [257]

Answer:

im pretty sure it is 3.0 K

Explanation:

8 0
3 years ago
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