Afreight train slows down as it approaches a train yard. if a force of -3.8 x 10^6 is required to provide an acceleration of -0.33 m/s^2, what is the train's mass?

28. evolution

29. environment, survive, offspring  

explanation:

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