A radio-controlled car powered by an electric motor accelerates from rest to 0.800 m/s in 23.0 ms. The total mass of the car is 675 g. What is the average power (in W) delivered to the car by the motor during its acceleration

9.39Watts

Explanation:

The work done by the car is converted to kinetic energy. Hence;

Work done = Kinetic energy =1/2mv²

Time t = 23ms =23×10^-3s

Mass = 675g = 0.675kg

v = 0.8m/s

Work done = 1/2(0.675)0.8²

Work done = 0.216Joules

Average power = Work done/Time

Average power = 0.216/0.023

Average power = 9.39Watts

Hence the average power (in W) delivered to the car by the motor during its acceleration is 9.39Watts

i think it is non rem sleep

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: