Rank the following in terms of increasing momentum:
a. a 10,000 kg train car at rest
b. a 100 kg person running at 5 m/s
c. a 1200 kg car going 15 m/s
d. a 15 kg meteor going at a speed of 1000 m/s

Ranks based on momentum are  

1. 1200 kg car going at 15 m/s.

2. 15 kg meteor going at a speed of 100 m/s.

3. 100 kg person running at 5 m/s.

4. 10000 kg train car at rest.

Explanation:

Product of a body’s mass and velocity gives the value of its momentum. It is given by the equation  

where is the mass of the object and is the velocity.

Calculating the values of momentum:

1. mass= 1200 kg, velocity= 15 m/s

2. mass= 15 kg, velocity= 1000 m/s

3. mass= 100 kg, velocity= 5 m/s

4. mass= 1000 kg, velocity= 0 m/s

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j