The loaded cab of an elevator has a mass of 3.0 × 103 kg and moves 210 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?

Explanation:

Given data

The elevator mass=3.0×10³ kg

Time t=23 s

elevator lift d=210 m

The power is the average rate of work done:

So

P=F.V Cosα

Where F is force

V is velocity

α is angle between Force and velocity

Apply the Newton Law to find the force on elevator

The velocity of elevator is given as

Since the net force has same direction of motion so α=0°

So

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2