Jeff is driving a remote controlled car around his living room. The car has a mass of 770 g. Jeff drives the car with a velocity of 4.1 m/s. What is the momentum of the car?

3.16kgm/s

Explanation:

Given parameters:

Mass  = 770g

Velocity  = 4.1m/s

Unknown:

Momentum of the car  = ?

Solution:

To solve this problem, we use the equation below:

       Momentum  = mass x velocity

Convert the mass to kg;

        770g to kg = 0.77kg

Now;

    Momentum  = 0.77 x 4.1  = 3.16kgm/s

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27