A child rows a rowboat north across a creek at 15 m/s. The creek flows east at 7 m/s.
What is the magnitude of the resultant velocity?

16.55m/s

Explanation:

If a child rows a rowboat north across a creek at 15 m/s and creek flows east at 7

m/s. the magnitude of the resultant velocity is gotten using pythagoras theorem as shown

R² = 15²+7²

R² = 225+49

R² =274

R = √274

R = 16.55m/s

Hence the magnitude of the resultant velocity is 16.55m/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