Answer:
The new intensity decreases by a factor of 16.
Explanation:
The intensity of sound wave is given by :
P is power
A is area
or
, r is distance from the source
If the distance from the source is increased by a factor of 4, r' = 4r
So,
So, the new intensity decreases by a factor of 16.
Answer:
250 kg/m3
Explanation:
The total volume of the raft is length times width times height
V = lwh = 2 * 3 * 0.5 = 3 m cubed
The volume of the raft that is submerged in water is 1/4 of total volume
3 /4 = 0.75 m cubed
Let water density = 1000 kg/m cubed and g = 10 m/s2
The buoyant force is equal to the weight of water displaced by the raft
F = 0.75 * 1000 * 10 = 7500 N
This force is balanced by the raft weight, so the weight of the raft is also 7500N
Mass of raft is 7500 / g = 7500 / 10 = 750 kg
Raft density is mass divided by volume = 750 / 3 = 250 kg/m3
It is reasonable because the ripples in the rock show how old and how fast the water went to make the rock. It also describes the time that it has been there, depending on how many years ago it was.
( I tried. I'm not that great at any kind of science )
The circuit breaker will tripped. Details below
<h3>What is power? </h3>
This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:
Power (P) = voltage (V) × current (I)
P = IV
<h3>How to determine the total power</h3>
The following data were obtained from the question:
- Power of heater = 1.50×10³ W
- Power of toaster = 750 W
- Power of grill = 1×10³W
- Total power = ?
Total power = power of heat + power of toaster + power of grill
Total power = 1.50×10³ + 750 + 1×10³
Total power = 3250 W
<h3>How to determine whether or not the circuit breaker will tripped</h3>
To determine if the circuit breaker will tripped or not, we shall determine the current used by the appliances. Detail below:
- Total power (P) = 3250 W
- Voltage (V)= 120 V
- Current (I) =?
P = IV
Divide both side by V
I = P / V
I = 3250 / 120
I = 27.08 A
Since the current used by the three appliances (i.e 27.08 A) is greater than the current the circuit breaker (i.e 25 A), can with stand,thus, the circuit breaker will tripped
Learn more about electrical power:
brainly.com/question/64224
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