Answer:
The answer is B. It is the one that has the triangle pointing up on the topside of the rope and seems to be a bit bigger than the other triangles.
Explanation:
Answer:
The current in the second loop will stay constant
Explanation:
Since the induced emf in the second coil, ε due to the changing current i₁ in the first wire loop ε = -Mdi₁/dt where M = mutual inductance of the coils and di₁/dt = rate of change of current in the first coil = + 1 A/s (positive since it is clockwise)
Now ε = i₂R where i₂ = current in second wire loop and R = resistance of second wire loop.
So, i₂R = -Mdi₁/dt
i₂ = -Mdi₁/dt/R
Since di₁/dt = + 1 A/s,
i₂ = -Mdi₁/dt/R
i₂ = -M × + 1 A/s/R
i₂ = -M/R
Since M and R are constant, this implies that i₂ = constant
<u>So, the current in the second wire loop will stay constant.</u>
normal force because it is perpendicular to the surface
<span>a) 10.0 m/s
b) -4.7 m/s
The formula for distance under constant acceleration is
d = 0.5AT^2
The formula for distance with a specified velocity is
d = VT
So the distance the keys travel with an initial velocity and under constant acceleration by gravity is
d = VT - 0.5AT^2
The acceleration due to gravity is 9.8 m/s^2 and the time T is 1.50 s, and finally, the distance traveled is 4.00 m. So substitute those values into the equation and solve for V
d = VT - 0.5AT^2
4.00m = 1.50s * V - 0.5 * 9.8 m/s^2 * (1.5s)^2
Do the multiplications
4.00m = 1.50s * V - 4.9m/s^2 * 2.25 s^2
Cancel the s^2 terms
4.00m = 1.50s * V - 4.9m * 2.25
Do the multiplication
4.00m = 1.50s * V - 11.025m
Add 11.025m to both sides
15.025m = 1.50s * V
Divide both sides by 1.50s
10.01667 m/s = V
Since we have 3 significant figures in the data, round results to 3 significant figures.
V = 10.0 m/s
So the keys were initially thrown upwards with a velocity of
10.0 m/s
Since it took 1.50 seconds from launch to catch, the velocity of the keys will decrease by 9.8 m/s^2 times the time. So
V = 10.0 m/s - 1.50s * 9.8 m/s^2
V = 10.0 m/s - 14.7 m/s
V = -4.7 m/s
So at the time the keys were caught, they were moving downward at a velocity of 4.7 m/s</span>
Answer:Wrap more turns of wire around the nail.
Explanation:The power of an electromagnet is directly proportional to the amount of electricity passing through that electromagnet.
Now,if they increase the number of rounds of the copper coil,the electricity conducting surface amount will also increase.
And that's why the electricity passing through that electromagnet will increase along with the electromagnetic power of that electromagnet.
• Increasing the battery voltage :
If they increase the battery voltage,the electricity which is passing through that electromagnet will also increase in amount .
And as discussed previously,the increasing amount of electricity will also increase the electromagnetic abilities of the electromagnet.
