Get premium membership and access questions with answers, video lessons as well as revision papers.
Refractive index = $\frac{velocity\;in\;air}{velocity\;in\;water}$,
1.33 = $\frac{3.0\times 10^8}{V_w}$
$\rightarrow$ V<sub>w</sub> = 2.256 x 10<sup>8</sup>
johnmulu answered the question on February 14, 2017 at 05:57
- One of the conditions for total internal reflection to occur is that angle of incidence must be greater than the critical angle of the medium. State the other condition(Solved)
One of the conditions for total internal reflection to occur is that angle of incidence must be greater than the critical angle of the medium. State the other condition.
Date posted: February 14, 2017. Answers (1)
- A small object lies at the bottom of a water pond at a depth of 1.2 m. Given that the refractive index of water is 1.3(Solved)
A small object lies at the bottom of a water pond at a depth of 1.2 m. Given that the refractive index of water is 1.3, Determine the apparent depth of the object. (Give your to 1 decimal place)
Date posted: February 14, 2017. Answers (1)
- Light travels through glass of refractive index 1.5 with a speed V. Calculate the value of V. (Speed of light in air = 3.0 x 108m/s)(Solved)
Light travels through glass of refractive index 1.5 with a speed V. Calculate the value of V. (Speed of light in air = 3.0 x 108m/s)
Date posted: February 14, 2017. Answers (1)
- A stone thrown vertically upwards reaches a height of 100 m. Determine the(Solved)
A stone thrown vertically upwards reaches a height of 100 m. Determine the:
i) Initial velocity of the stone
(Neglect air resistance and take g = 10ms-2)
ii) Total time the stone is in air.
Date posted: February 14, 2017. Answers (1)
- A ball of mass 200 g is thrown vertically upwards with velocity of 5ms-1. The air resistance is 0.4 N. Determine(Solved)
A ball of mass 200 g is thrown vertically upwards with velocity of 5 ms-1. The air resistance is 0.4 N. Determine:
i) The net force on the ball as it moves up;
ii) The acceleration of the ball;
iii) The maximum height reached by the ball,
(take acceleration due to gravity g = 10 ms-2)
Date posted: February 14, 2017. Answers (1)
- A particle starts from rest and accelerates uniformly in a straight line. After 3 seconds it is 9 m from the starting point(Solved)
A particle starts from rest and accelerates uniformly in a straight line. After 3 seconds it is 9 m from the starting point. Determine the acceleration of the particle
Date posted: February 14, 2017. Answers (1)
- A trolley moving on a horizontal bench of height 1.2 m, strikes a barrier at the edge of the bench. The brass mass on the top of the trolley flies off on impact and lands(Solved)
A trolley moving on a horizontal bench of height 1.2 m, strikes a barrier at the edge of the bench. The brass mass on the top of the trolley flies off on impact and lands on the ground 2.5 m from the edge of the bench. Determine:
i) The time taken by the brass mass to reach the ground
ii) The speed at which the trolley struck the barrier.
Date posted: February 14, 2017. Answers (1)
- A matatu starts from rest and accelerates to cover a distance of 49 m in 7 seconds. Determine: ( i) Its acceleration ( ii) Its velocity after 7 seconds(Solved)
A matatu starts from rest and accelerates to cover a distance of 49 m in 7 seconds. Determine:
i) Its acceleration;
ii) Its velocity after 7 seconds
Date posted: February 14, 2017. Answers (1)
- A particle starts from rest and accelerates uniformly in a straight line. After 3 seconds it is 9m from the starting point(Solved)
A particle starts from rest and accelerates uniformly in a straight line. After 3 seconds it is 9m from the starting point. Determine the acceleration of the particle.
Date posted: February 11, 2017. Answers (1)
- A bullet is fired horizontally from a platform 15 m high. If the initial speed is 300 m/s-1(Solved)
A bullet is fired horizontally from a platform 15 m high. If the initial speed is 300 m/s-1, determine the maximum horizontal distance covered by the bullet.
Date posted: February 11, 2017. Answers (1)
- A bullet moving at a velocity of 300 ms-1 hits a tree trunk of diameter 50 cm. It emerges from the opposite side with a velocity of 150 ms-1(Solved)
A bullet moving at a velocity of 300 ms-1 hits a tree trunk of diameter 50 cm. It emerges from the opposite side with a velocity of 150 ms-1. Determine the average deceleration of the bullet in the trunk.
Date posted: February 11, 2017. Answers (1)
- A bullet is fired horizontally at a target. Neglecting air resistance give a reason why the horizontal acceleration of the bullet is zero (Solved)
A bullet is fired horizontally at a target. Neglecting air resistance give a reason why the horizontal acceleration of the bullet is zero.
Date posted: February 11, 2017. Answers (1)
- An object dropped from a height h, attains a velocity of 6 ms-1 just before hitting the ground. Find the value of h(Solved)
An object dropped from a height h, attains a velocity of 6 ms-1 just before hitting the ground. Find the value of h.
Date posted: February 11, 2017. Answers (1)
- A body moving initially at 50m/s decelerates uniformly at 2 ms-2 until it comes to rest(Solved)
A body moving initially at 50m/s decelerates uniformly at 2 ms-2 until it comes to rest. What distance does it cover from the time it started decelerated?
Date posted: February 11, 2017. Answers (1)
- A pipe of radius 6 mm is connected to another pipe of radius 9 mm. If water flows in wider pipe at the speed of 2 ms-1, what is the speed in the narrower pipe?(Solved)
A pipe of radius 6 mm is connected to another pipe of radius 9 mm. If water flows in wider pipe at the speed of 2 ms-1, what is the speed in the narrower pipe?
Date posted: February 11, 2017. Answers (1)
- Start Bernoulli's principle(Solved)
Start Bernoulli's principle.
Date posted: February 11, 2017. Answers (1)
- Water flows in horizontal smooth pipe. State the changes that would be observed in the nature of the flow if the speed of the water(Solved)
Water flows in horizontal smooth pipe. State the changes that would be observed in the nature of the flow if the speed of the water is steadily increased from low to high value.
Date posted: February 11, 2017. Answers (1)
- State how the pressure in moving fluid varies with the speed of the fluid(Solved)
State how the pressure in moving fluid varies with the speed of the fluid.
Date posted: February 11, 2017. Answers (1)
- State one factor that affects the speed of sound in solid(Solved)
State one factor that affects the speed of sound in solid.
Date posted: February 11, 2017. Answers (1)
- A boy standing in front of a cliff blows a whistle and hears the echo after 0.5 s. He then moves 17 metres further away from the cliff and blows the whistle again(Solved)
A boy standing in front of a cliff blows a whistle and hears the echo after 0.5 s. He then moves 17 metres further away from the cliff and blows the whistle again. He now hears the echo after 0.6 s. Determine the speed of the sound.
Date posted: February 11, 2017. Answers (1)