To solve the problem it is necessary to apply the concepts related to sound intensity. The most common approach to sound intensity measurement is to use the decibel scale:
Where,
is a reference intensity. It is the lowest or threshold intensity of sound a person with normal hearing can perceive at a frequency of 1000 Hz.
I = Sound intensity
Our values are given by,
For each auto the intensity would be,
Therefore the sound intesity for the 7 autos is
The sound level for the 7 cars in dB is
Answer:
The coefficient is 0.90
Explanation:
Drawing a diagram makes thing easier, we will assume that the acceleration tends to zero because it start barely moving.
I) You walk barefoot on the hot street and it burns your toes.
The road is in direct contact with your skin. Thermal energy from the road will transfer to the bottom of your feet, then to the rest of your body. This is an example of conduction.
II) When you get into a car with hot black leather in the middle of the summer and your skin starts to get burned.
Just like in the previous example, the hot leather is in direct contact with your skin (I guess if you're going to drive naked). Thermal energy from the leather will transfe to your skin, then to the rest of your body. This is also conduction.
III) A flame heats the air inside a hot air balloon and the balloon rises.
The flame heats air directly at the bottom of the balloon. The warm air expands and becomes less dense. This will rise and let the unheated, denser air in the balloon fall down toward the flame. This is an example of the convection cycle.
IV) A boy sits to the side of a campfire. He is 10 feet away, but still feels warm.
The campfire heats air directly nearby. The warm air expands and moves away from the fire in all directions, leaving behind unheated, denser air to be heated up. Some of the warm air reaches the boy. This is another example of convection.
The answer is A) 1 and 2.
Answer:
T = T
Explanation:
Time period of a simple pendulum is not affected by the mass of the bob. As we know, 
. There is no factor of mass affecting when we derived the equation. The basic reason behind the time period is not affected is because of mass dependence on angular acceleration. As the mass increases the acceleration increase and the Time Period remains constant.
Answer:
The correct answers to the question are
The following statements about neurons are NOT true
A. The resting membrane potential is generally in the range of -40 mv to -75 mv.
C. Neurons repolarize by opening chloride channels on the membrane.
D. An action potential can occur when the neuron's sodium gates open.
Explanation:
A. The resting membrane potential is generally in the range of -40 mv to -75 mv.
Not true the resting potential for neurons range from -70 to -80 mv
B. Maintaining resting membrane potential requires the use of energy from ATP True
The potential of the membrane arises from the splitting of potassium ions from the intracellular anions by agents powered by ATP
C. Neurons repolarize by opening chloride channels on the membrane
Not True
Repolarization occurs by the outward transit of the positively charged K⁺ from the cell
D. An action potential can occur when the neuron's sodium gates open.
Not True
An action potential takes place once the neuron transmits information along an axon. An action potential results when different ions pass through the membrane of the neuron
