PHYSICS HIGH SCHOOL

An ambulance driving with velocity v/8 where v is the speed of sound, emits a siren with a frequency of . What is the frequency heard by a stationary observer toward whom the ambulance is driving?

Answers

Answer 1
Answer: Frequency = 1/ Time period

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In which of the following methods of heat transfer is it necessary for the objects to be directly touching one another? A. convection. B. radiation. C. conduction. D. all of these.

Answers

The following method that is necessary for the objects to be directly touching one another is called conduction. 
Conduction is the direct transfer of heat

Which of the following is not a type of pulley systemA fixed
B movable
C combination
D advantageous

Answers

D advantageousA pulley is a wheel on an axle or shaft that is designed to support movement and change of ... The drive element of a pulley system can be a rope, cable, belt, or chain that runs over the pulley.

If Mr. Kirwan’s pet Fluffy the Wonder Hamster rides his unicycle at a rate of 5m/s to thenorth on a flatbed train car. Under what conditions do you see him moving at 5 m/s?

Answers

The condition that would induced the seer or observer to see that the pet hamster is moving at 5 m/s is when the train is also moving at that speed. This is because the unicycle will only allow limited vision to the seer thinking that the pet hamster is not moving at that speed. 

A 7.5 kg block is placed on a table . If it's bottom surface area is 0.6m2 how much pressure does the block exert on the table top?

Answers

Pressure is defined as the force per unit area. This measurement is more convenient to use for describing a force exerted. The standard unit for pressure is Pascal. For this problem, force is the gravitational pull from the block. Calculations are as follows:

P = F/A where F = mg

F = 7.5 ( 9.81) = 73.6 N

P = 73.6 N / 0.6 m^2 = 122.6 Pa

The greater the concentration of sulfur and nitrogen oxides, the higher the pH of precipitation.True
False

Answers

Answer: False

Nitrogen and sulfur dioxide are acidic oxides in nature. The burning of fossil fuels and other sources are responsible for addition of these oxides in the atmosphere of earth. These oxides mixed with water vapor causes acid rain. Being acidic in nature they will have low pH value. Therefore, greater the concentration of sulfur and nitrogen oxides, will lower the pH value of precipitation.

Answer:

False

Explanation:

An observer notes that the pitch of a sound is becoming progressively lower. The observer can conclude that the sound is moving

Answers

He can conclude that the source of the sound is moving away from him and that its speed is increasing.
The source of the sound is moving away from the receiver.
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