Average speed = (total distance covered) / (time to cover the distance)
-- Traveling at 40 mph for 1 hour, the distance covered is 40 miles.
-- Traveling at 60 mph for 1 hour, the distance covered is 60 miles.
-- Total distance covered = (40 miles) + (60 miles) = 100 miles
-- Total time = (1 hour) + (1 hour) = 2 hours
-- Average speed = (100 miles) / (2 hours)
<em>Average speed = 50 miles per hour</em>
Answer:
Magnetic field lines form closed loops around current carrying straight wires.
Explanation:
Magnetic field lines is known to form closed loop (which also serves as a bar magnet) around current carrying conductor in a magnetic field. This direction of the loop around the conductor either clockwise or anticlockwise will determine the direction of current in the conductor.
This directions can be determined using the Maxwell cockscrew or clenched fist rule.
According to clenched fist rule which states if the conductor is grasp with the right hand, the curled finger will point in the direction of the magnetic field and the thumb will point in the direction of the current.
Note that the magnetic field lines around the conductor also behaves like a bar magnet.
<u>Answer</u>
C.) 1.0 x 10^2 Newton’s
<u>Explanation</u>
The Newton's second law of motion states that, the rate of change of momentum is proportional to the force producing it.
∴ F = (mv- mu)/t
Ft = mv - mu.
The quantity Ft is called the impulse.
Ft = 0.30 Newton seconds
but t = 3.0 x 10⁻³ seconds
Ft = 0.30 Ns
F × 3.0 x 10⁻³ = 0.30 Ns
F = 0.30 / (3.0 x 10⁻³)
= 100 N
Answer = C.) 1.0 x 10^2 Newton’s
Answer:
Velocity 
V = Q + 3Rt²
at t = 0, 
= Q + 3r(0) ==> Q
at t = T, 
= Q + 3rT²
Work done (W) = ΔKE = 
W = ![\frac{1}{2} m[(Q + 3RT^{2})^{2} - Q^{2}]](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20m%5B%28Q%20%2B%203RT%5E%7B2%7D%29%5E%7B2%7D%20-%20Q%5E%7B2%7D%5D)
W = 
[Q² + 9R²T⁴ + 2Q(3RT²) - Q²]
W = (9R²T⁴ + 6QRT²)
Explanation:
Differentiate the position.
Find the equation for speed.
Find the initial and final speed.
Use work energy theorem to find the work done by finding the change in kinetic energy.
