Ahelicopter above the ground is descending at 3.5m/s. it drops a package from rest (relative to the helicopter). just before it hits the ground the package is falling at a rate of 13.4m/s relative to the ground. find the velocity of the package relative to the helicopter. a. 9.9m/s, up b. 9.9m/s, down c. 16.9m/s, down d, 16.9m/s, up

The velocity of the package relative to the helicopter is 9.9 m/s down.

(B) is correct option

Explanation:

Given that,

Velocity of helicopter = 3.5 m/s

Velocity of package = 13.4 m/s

We need to calculate the velocity of the package relative to the helicopter

Just before hitting the ground

Velocity of package relative to helicopter =  Velocity of package relative to ground - Velocity of  helicopter relative to ground

Put the value into the formula

Hence, The velocity of the package relative to the helicopter is 9.9 m/s down.

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