The speed of sound in air doesn't depend on the frequency of the sound. It depends on the temperature, pressure, and humidity of the air. It's usually around <em>340 m/s</em> .
ANSWER:
a) 25.97 N
b) 47.53 N
STEP-BY-STEP EXPLANATION:
Given:
Beaker mass = 1.2 kg
Water mass = 2.5 kg
Water density = 1000 kg/m^3
Block mass = 3.8 kg
Block density = 3300 kg/m^3
a)
The first thing is to calculate the volume of the block, like this:
Mass of water displaced by the block is:
The block will receive a push from the water equal to the weight of the water displaced by the block, or the effective weight of the block will be reduced by the same amount:
Therefore, 25.97 N is the reading on the hanging scale.
b)
The bottom scale will gain by the same amount (1.15 kg). Therefore, the totalweight on the bottom scale is:
Therefore, 47.53 N is the reading on the lower scale.
Answer:
Efficiency = 20%
Explanation:
Given the following data;
Input energy = 1000 Joules
Output energy = 200 Joules
To find the efficiency of the solar cell;
Substituting into the formula, we have;
Efficiency = 20%
It is A I have done this in my science.Try Quizlet for more info.<span />