Abus starts to move from rest. if it's velocity becomes 90 km per hour after 8 seconds , calculate it's acceleration (numerical problem)

Assuming the bus undergoes constant acceleration, it is given by:

a = (Vf-Vi)/Δt

a is the acceleration, Vf is the final velocity, Vi is the initial velocity, and Δt is the elapsed time.

Given values:

Vf = 90km/hr = 25m/s (the conversion rate from km/hr to m/s is 1/3.6)

Vi = 0m/s (starts from rest)

Δt = 8.0s

Plug in the values and solve for a:

a = (25-0)/8

a = 3.125m/s²

Round to 2 significant figures.

a = 3.1m/s²

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards