Answer:
option D
Explanation:
given,
mass of the car 1 = m
speed of car 1 = v
time taken to stop the car = t
mass of car 2 = m' = 2 m
speed of the car 2 = v
time taken by the car to stop = t' = ?
now,
we know,
F = m a....(1)
and force by the second car
F = m' a'
F = 2 m a'
from equation (1)
using equation of motion
v = u + at
0 = v - a t
again using equation of motion for the calculation of the time taken by the second car.
t' = 2 t
hence, the time taken by the second car is twice the time taken by the first car to stop.
The correct answer is option D
Answer:
Recall, The magnetic field on a electron in a wire, Bₓ = (µ₀ I)/(2πr)
Note: Magnetic force direction is at right angles to electron motion.
Magnetic force, F = q * v * Bₓ
Substituting Bₓ into F, we have
F = q * v * Bₓ = (q * v * µ₀* I)/(2π r) = (1.6 x 10⁻¹⁹ x 1.0 x 10⁷ x 4π x 10⁻⁷ x 50)/( 2π x 5 x 10⁻²) = 3.2 x 10⁻¹⁶ N
a) Hence, the magnitude of the magnetic force on the electron if the electron velocity is directed (a) toward the wire is 3.2 x 10⁻¹⁶ N and opposite the current
b) Hence, the magnitude of the magnetic force on the electron if the electron velocity is directed (b) parallel to the wire in the direction of the current is 3.2 x 10⁻¹⁶ N and away from the wire.
c) Hence, the magnitude of the magnetic forces on the electrons if the electron velocity is perpendicular to the two directions defined by (a) and (b) is 3.2 x 10⁻¹⁶ N and (a) direction - opposite the current, (b) same direction as current.
Sound waves travel through the air to your eardrum
The answer to your question is b
Explanation:
Continental rifts and mid-ocean ridges are both features of a divergent plate margin.
In both cases plates are moving away from one another. Therefore they are creating new land masses.
- A continental drift like the east African rift valley is where a continent begins to pull apart or diverges.
- A mid-ocean ridge is divergent margin in the ocean.
They are different in that, continental rift occurs within the continental plate that are on land.
But:
Mid-ocean ridges are in the oceanic crust in the ocean . They form the largest physiographic structure on the earth surface called the mid-ocean ridge.
learn more:
Descending lithosphere brainly.com/question/9582362
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