Answer:
a = 4.59 m/s²
Explanation:
given,
initial speed of the car = 0 m/s
final speed of the car = 145 km/h
1 Km/h = 0.278 m/s
145 Km/h = 145 x 0.278 = 40.31 m/s
time, t = 8.78 m/s
Acceleration of car before collision
a = 4.59 m/s²
The magnitude of acceleration before collision is 4.59 m/s²
Answer:
9,000 N.
Explanation:
Workdone can be defined as the ability to do work. It is also the product of the force and the distance it is being moved.
Mathematically,
W = F * d
= 180,000/2
= 90,000 N.
Weight of the 10 cars = 90,000 N.
Weight of a car = 90000/10
= 9,000N.
Answer:
distance travelled 7 metres and
displacement 3 metres
Explanation:
Distance travelled is the total diatance travelled by you which is 2m + 5m = 7m
Displacement is the shortest distance between two points start and stop which is 3m.
Answer:
Explanation:
Let v be the terminal velocity of the bar .
emf induced in the bar of length L
= B L v where B is the value of magnetic field.
current i in the circuit containing resistance R
i = induced emf / R
BLv / R
Magnetic force in upward direction in the bar
F = BiL
= BL x BLv / R
B²L²v / R
For attainment of uniform velocity
magnetic force = weight
B²L²v / R = mg
so current
i = BLv / R