A : lighter than lead shot, reducing its velocity and distance
Answer:
f = 735 Hz
Explanation:
given,
Person distance from speakers
r₁ = 4.1 m r₂ = 4.8 m
Path difference
d = r₂ - r₁ = 4.8 - 4.1 = 0.7 m
For destructive interference
where, n = 1, 3,5..
we know, λ = v/f
v is the speed of the sound = 343 m/s
f is the frequency
for n = 1
f = 245 Hz
for n = 3
f = 735 Hz
Hence,the second lowest frequency of the destructive interference is 735 Hz.
Answer:
d. All three statements are true.
Explanation:
In the metals the electrons are the charge carriers and they are the only mobile charges causing the flow of current when subjected to potential difference.
The electrons being negatively lead to the flow of current in opposite direction. The direction of the current is opposite to the direction of the negative charges.
The reactants are on the left and the products are on the right of the equation
Answer:
A
Explanation:
Given that two balls are in motion. A 2-kg ball moving at 4m/s and a 4-kg ball moving at 2m/s, which one has greater kinetic energy? a. 2 kg ball moving at 4 m/s c. Both balls have the same KE b. 4 kg ball moving at 2 m/s d. Cannot be determined
The formula for kinetic energy is :
K.E = 1/2mv^2
A 2-kg ball moving at 4m/s will have kinetic energy of 1/2 × 2 × 4^2
K.E = 16J
and a 4-kg ball moving at 2m/s will have kinetic energy of 1/2 × 4 × 2^2
K.E = 2 × 4
K.E = 8J
which one has greater kinetic energy? Definitely it is a 2 kg ball moving at 4 m/s. Since 16J is greater than 8J. The correct answer is A.
