B. third
for every action there is a reaction*
yes. gravity is working on you and everything on you.
also earth is rotating
no not in respect ofimmediate surroundings
object could move at constant velocity = no change in either magnitude or direction
change of position "proves" this
Answer:
Total momentum of the system is 378 kg-m/s
Explanation:
It is given that,
Mass of first bumper car, m₁ = 222 kg
Velocity of first bumper car, v₁ = 3.10 m/s (in right)
Mass of other bumper car, m₂ = 165 kg
Velocity of second bumper car, v₂ = -1.88 m/s (in left)
Momentum of the system is given by the product of its mass and velocity. So, the total momentum of this system is given by :
p = 378 kg-m/s
Hence, the total momentum of the system is 378 kg-m/s
Answer:
The minimum power the motor would need is 2035 Watts.
Explanation:
the minimum power motor needed is given by the total work done on the load, Wtot and the total time it takes the load to be lifted, given by:
P = Wtot/t
the forces doing works on the load is the gravitational force, Wfg and the frictional force, Wf the total work done on the load is:
Wtot = Wfg + Wf
= m×g×d + f×d
= d×(m×g + f)
= (30)×(200×9.8 + 75)
= 61050 J
it takes t = 30s for the load to be lifted high the building, the minimum power neeed is then:
P = Wtot/t
= (61050)/(30)
= 2035 Watts
Therefore, the minimum power the motor would need is 2035 Watts.
C. 4.2 mL
3.1+2.7+4.6+1.9+8.7mL=21
there are 5 numbers
21÷5=4.2
