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When the driver of a car travelling at 72km/h suddenly sees a pedestrian in front of the car , he applies the brakes. Consider the reaction time of the driver is 0.2s. if the maximum deceleration that the brakes can produce is 20m/s2, Find the maximum stopping distance for the car
A stone is thrown vertically upwards from the ground with an initial velocity of 20ms-1.
a)What is the maximum height reached?
b)How long does the ball take to reach this maximum height?
c)How long does it take for the ball to fall to the ground again from the maximum height?
2. Given z1 = 2∠45o
, ; z2 = 3∠120o and z3 = 4∠180o
. Determine the following and leave your
answers in rectangular form:
(i)
(z1)2 +z2
z2 +z3
(5)
(ii)
z1
z2z3
1. Write
(2−i) (4−3i)2
3+2i
(4)
in the form a+bi, where a,b ∈ R.
A ball falls 20meters from rest to the ground below
a)What is the velocity as it strikes the ground?
b)How long does it take to fall?
A stone takes 3s to reach the ground. What is the height above the ground ?
A motor cyclist travelling at 12m/s decelerates at 3m/s2.
a) How long does it take?
b) how far does he travel in coming to rest?
- Which element has atoms in the ground state with the greatest number of valence electrons?
A coin is tossed C times what is the probability of getting exactly B heads
Raindrops falling from thunderclouds may carry charges as high as 3.3*10-11 C/drop. According to The Rayleigh limit; what is the minimum size of drop
#339914 on Dec 2023