Answer:
check 2 photos for answer
check 2 photos for answer
(a) The car is undergoing an acceleration of
so that in 9.02 s, it will have covered a distance of
The car has tires with diameter <em>d</em> = 58.5 cm = 0.585 m, and hence circumference <em>π d</em> ≈ 1.84 m. Divide the distance traveled by the tire circumference to determine how many revolutions it makes:
(b) The wheels have average angular velocity
where is the average angular velocity, and are the initial and final angular velocities (rev/s), and are the initial and final angular displacements (rev), respectively, and is the duration of the time between initial and final measurements. The second equality holds because acceleration is constant.
The wheels start at rest, so
Answer:
Depending on the locomotive, it can use steam, batteries or a diesel engine.
A car uses a DC battery to start it and an internal combustion engine to run it (unless it is an electric car, then it uses DC batteries.
A portable media player can use either a/c or a battery.
A flashlight uses DC batteries.
Answer:
Explanation:
Resistivity is given by where A is cross-sectional area, R is resistance, L is the length and is the reistivity. Substituting 0.0625 for R, 3.14 × 10-6 for A and 3.5 m for L then the resistivity is equivalent to
Answer:
185 A
Explanation:
In order for the rod to float above the ground, the magnetic force between the two rods must be equal to the weight of the floating rod.
So we can write:
where the term on the left is the magnetic force and the term on the right is the weight, and where:
is the vacuum permeability
is the current in the two rods (they carry the same current)
is the length of the floating rod
r is the distance between the rods
is the mass of the floating rod
g is the acceleration due to gravity
Here we have:
Therefore, solving for I, we find: