Answer:
Chest experiences the friction forces towards right
Explanation:
Friction forces can be defined as a force a body experiences when it is made to slide against the surface. Friction force always acts to stop the the body which is moving. To stop the body, it always acts in the opposite directions to the motion of the body. Therefore, if the treasure chest is dragged across a sandy beach to the left, the frictional forces will act in the right direction.
John needs to see a physical therapist because he cannot walk very well.
Answer:
v = 0.76 [m/s]
Explanation:
The linear momentum generated by the shot must be calculated. This can be calculated using the following expression.
where:
P = linear momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
![P=0.004*380\\P=1.52[kg*m/s]](https://tex.z-dn.net/?f=P%3D0.004%2A380%5C%5CP%3D1.52%5Bkg%2Am%2Fs%5D)
Now we can calculate the recoil velocity, because the momentum is equal for the rifle.
![P=m*v\\v = P/m\\v = 1.52/2\\v = 0.76[m/s]](https://tex.z-dn.net/?f=P%3Dm%2Av%5C%5Cv%20%3D%20P%2Fm%5C%5Cv%20%3D%201.52%2F2%5C%5Cv%20%3D%200.76%5Bm%2Fs%5D)
C. A shared public ledger on which entire bitcoin network relies
Explanation:
here,load=100N
effort=200N
distance travelled by load=2cm
distance travelled by effort=10cm
Now, output work=L*Ld
=100*2
=200g
Again,
input work =E*Ed
200*10
2000j
again, efficiency = output work/input work*100%
200/2000*100%
=10%
please don't forget to write symbol
