Acar is travelling at a constant speed of 30m s -1 on
the road when a kangaroo crosses in front of the car at a distance of 65 m away. the driver takes 0.6 seconds to hit the brakes and then she decelerates with a constant deceleration 10.0 m s -2
calculate how fast the car is travelling in m s.

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

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: