Answer:
Time taken for the car to travel a distance of 4.50 m = 1.40 seconds
Explanation:
velocity of toy car = 3.21 m/s
distance travelled by toy car = 4.50 m
Time = ?
Therefore, the time taken for the car to travel a distance of 4.50 m = 1.40 seconds
Answer:
Magnetic field can be used to produce current, infact a changing magnetic field can produce current.
A changing magnetic field in a loop causes the flux linked with the loop to change in turn generating a emf in the loop and therefore a current.
For a loop of area A and resistance R.
I =dPhi/dt/R
В. А
I = AcosФ/R .dB /dt
But it isn't reasonable to say that we can create a magnetic field by having a flow of current and this can be used to make more current because the current generated due to change in magnetic field created by increase/decrease in flow of current will be in a direction such that it will counter act the change in magnetic field caused by increase/decrease in current flow.(lenz's law).
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Ф= В. А
I = Acos dB Rd
Answer:14.14 cm
Explanation:
Given
Spring Compression 
Potential energy Stored in spring
Suppose k is the spring constant of spring
Potential Energy of spring is given by 
for 100 J energy
Average speed =
(total distance)/(total time)
Average speed = (99+90)/(2+3)
That's (189 km) / (5 hr)
Average speed = 37.8 km/hr
