net force= the sum of all the forces acting on the object
the frictional force is opposite to the direction of motion of the object
If the object moves to the right (positive) then the friction force moves to the left (negative).
so the net force: 50 N - 5 N = 45 N (B)
Answer:
It is at a higher frequency then the original one
Explanation
Got this right on a quiz a while back
Work done = force × distance travelled in the direction of the force
Force= 2(9.81) = 19.62N
WD= 19.62×130= 2550.6Nm
Auroras are frequently seen : B. After solar flares
The Aurora is created by an ongoing influx of particles into the Earth's existing magnetic field,
This particles originated from the Sun as part of Solar wind
hope this helps
1000W * 4*60 s /( 3600 s/h) / (1000 W/kW)
= 1000*4*60/(3600*1000) kW-h
= 240/3600 kW-h
=1/15 kW-h
= 0.0667 kW-h (to 4 decimal places)