A car is moving at a speed of 60 m/s, when the driver applies the brakes, which causes a deceleration of 2 m/s2. How many seconds will it take for the car to stop and how far will it travel till it stops

30s, 900m

Explanation: once the break is applied, the car will decelerate and the car will come to rest.

Since the car is coming to rest, final velocity (v) equals zero.

Hence u = 60 m/s, a = - 2m/s²

Recall that v = u + at

0 = 60 +( - 2)t

2t = 60, t = 60 /2 = 30s.

To get the distance covered before the car comes to rest, we have the formulae below

v² = u² + 2as

0² = 60² + 2(-2)s

0 = 3600 - 4s

4s = 3600

s = 3600/ 4 = 900m

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:

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic