Assuming you are supposed to write each conversion in scientific notation:
(2) 1 m = 100 cm, so
(67 cm) × (1/100 m/cm) = 67/100 m = 0.67 m = 6.7 × 10 ⁻¹ m
(3) 1 km = 1,000 m, so
(1.2 km) × (1000 m/km) = 1200 m = 1.2 × 10³ m
(4) 1 m = 1,000 mm = 10³ mm, so
(6.2 × 10 ⁻³ m) × (10³ mm/m) = 6.2 mm
(5) 1 m = 1,000,000,000 nm = 10⁹ nm, so
(4.05 × 10³ nm) × (1/10⁹ m/nm) = 4.05 × 10 ⁻⁶ m
(6) 1 g = 1,000,000 µg = 10⁶ µg, so
(3200 µg) × (1/10⁶ g/µg) = 3200 × 10 ⁻⁶ g = 3.2 × 10 ⁻³ g
A. I looked it up and it should be somewhere around A
Answer:
During start total turns

After half of the time total turns

Total number of turns during it stop

After half of the time total turns

Explanation:
Initially the machine is at rest and then starts rotating with speed 3550 rev/min
now we will have

now we know that it took 10 s to reach the speed
so angular acceleration is given as


now it stops in 31 s so the angular deceleration is given as

now initially number of turn to reach the given speed

number of turns during it stop

Now during startup speed after t = 5 s is given as


now during it stop the speed after half the time is given as

now the number of turns is given as


Answer:
The net force should be of a magnitude of 64 N
Explanation:
We use Newton's second Law for this:

which for our case gives:

Answer:
The magnitude is 
The direction is the positive x axis
Explanation:
From the question we are told that
The electric field is E = 450 V/m in the negative y ‑direction
The speed of the proton is
in the positive z direction
Generally the overall force acting on the proton is mathematical represented as

Now for the beam of protons to continue un-deflected along its straight-line trajectory then 
So

=> 
Generally from unit vector cross product vector multiplication

So the direction of B (magnetic field must be in the positive x -axis )
So

=> 
=>
=>
=> 
=>