Answer:
<em>The final velocity of the hockey puck = 10.53 m/s</em>
Explanation:
<em>Impulse: </em><em>Impulse of a body is defined as the product of Force of a body and the time. Or it can also be defined as the product of the mass of a body and its change in velocity. The S.I units of impulse are, Ns or kgm/s. </em>
<em>Mathematically, impulse can be represented as,</em>
I = m(v-u)
making v the subject of formula in the equation above,
v = (I/m)+u...................... Equation 1
Where I = impulse of a body, m = mass of the body, u = initial velocity of the body, v = final velocity of the body.
<em>Given: I = 14.4 kgm/s, m = 4.6 kg, u = 7.4 m/s.</em>
<em>Substituting these values into equation 1</em>
<em>v = (14.4/4.6)+7.4</em>
<em>v = 3.13 + 7.4</em>
<em>v = 10.53 m/s</em>
<em>Therefore the final velocity of the hockey puck = 10.53 m/s</em>
Answer:
The 10 rules of badminton are as follows:
1. A game starts with a coin toss. Whoever wins the toss gets to decide whether they would serve or receive first OR what side of the court they want to be on. The side losing the toss shall then exercise the remaining choice.
2. At no time during the game should the player touch the net, with his racquet or his body.
3. The shuttlecock should not be carried on or come to rest on the racquet.
4. A player should not reach over the net to hit the shuttlecock.
5. A serve must carry cross court (diagonally) to be valid.
6. During the serve, a player should not touch any of the lines of the court, until the server strikes the shuttlecock. During the serve the shuttlecock should always be hit from below the waist.
7. A point is added to a player's score as and when he wins a rally.
8. A player wins a rally when he strikes the shuttlecock and it touches the floor of the opponent's side of the court or when the opponent commits a fault. The most common type of fault is when a player fails to hit the shuttlecock over the net or it lands outside the boundary of the court.
9. Each side can strike the shuttlecock only once before it passes over the net. Once hit, a player can't strike the shuttlecock in a new movement or shot.
10. The shuttlecock hitting the ceiling, is counted as a fault.
Explanation:
Answer: The correct answer is option (B).
Explanation:
Law of conservation of mass: 'In a chemical reaction, mass neither be created nor be destroyed'
In the balance chemical equation,total mass of the reactants is equal to the total mass of the products.
A.
117 g/mol ≠ 58.5 g/mol
Law of Conservation of Mass not followed.
B.
117 g/mol = 117 g/mol
Law of Conservation of Mass is followed.
C.
188 g/mol ≠ 117 g/mol
Law of Conservation of Mass not followed.
D.
94 g/mol ≠ 117 g/mol
Law of Conservation of Mass not followed.
Hence, the correct answer is option (B).
Answer:
(i) The wavelength is 0.985 m
(ii) The frequency of the wave is 36.84 Hz
Explanation:
Given;
mass of the string, m = 0.0133 kg
tensional force on the string, T = 8.89 N
length of the string, L = 1.97 m
Velocity of the wave is:
(i) The wavelength:
Fourth harmonic of a string with two nodes, the wavelength is given as,
L = 2λ
λ = L/2
λ = 1.97 / 2
λ = 0.985 m
(ii) Frequency of the wave is:
v = fλ
f = v / λ
f = 36.29 / 0.985
f = 36.84 Hz