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nekit [7.7K]
3 years ago
13

You're reading an article about forest fires in california and it features a photograph of firefighters battling a fire on a hil

lside next to a freeway. the firefighters are at the bottom of the hill using a firehose to control a fire that's in the middle of the hill. you're curious how fast the water is exiting the nozzle. analyzing the photograph in photoshop, you determine that the firehose nozzle is being held 2.1 m above the ground and is angled 43 ∘ above the horizontal. furthermore, the water from the hose lands on the hill 30 m from the feet of the firefighters. the article mentions that the grade of the hill is 37%, which corresponds to a slope of 20∘ above the horizontal. what is the speed the water when it exits the hose?

Physics
1 answer:
Lelechka [254]3 years ago
7 0
I will say it is about 20 m/s

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1. A silicon BJT is connected as shown in Fig 1, where RC = 3.6 k 2. VBE = 0.8 V. (10%)
Masja [62]

Answer:

The circuit is missing attached below is the required circuit

answer :

a) Ic = 1.944 mA

  Rp = 288.66 kΩ

b) <em>The Emitter-base Junction of the BJT is forward biased while its collector-base junction is reverse biased</em>

Explanation:

Rc = 3.6 kΩ

VBE = 0.8 v

<u>1) predict Ic and specify Rp to establish Vce at 5 V </u>

we will apply Kirchhoff's voltage law to resolve this

solution attached below

b ) The BJT is said to be in Forward reverse bias because <em>The Emitter-base Junction of the BJT is forward biased while its collector-base junction is reverse biased</em>

4 0
3 years ago
What is the advantage in solving motion problems using energy conservation principles instead of free body diagrams
riadik2000 [5.3K]

Answer:

However, the disadvantages are:

1. Many atimes for some motion prolems, free-body diagrams has to be drawn many times so to have enough equations to solve for the unknowns. This is not the same with energy conservation principles.

2. In situations where we need to find the internal forces acting on an object, we can't truly solve such problems using free-body diagram as it captures external forces. This is not the same with energy conservation principles.

Explanation:

Often times the ideal method to use in solving motion problem related questions are mostly debated.

Energy conservation principles applies to isolated systems are useful when object changes their positions in moving upward or downward converts its potential energy due to gravity for kinetic energy, or the other way round. When energy in a system or motion remains constant that is energy is neither created nor destroyed, it can therefore be easier to calculate other unknown paramters like in the motion problem velocity, distance bearing it in mind that energy can only change from one type to another.

On the other hand, free body diagram which is a visual representation of all the forces acting on an object including their directions has so many advantages in solving motion related problems which include finding relationship between force and motion in identifying the force acting on a body.

5 0
3 years ago
The change of an atom from an excited state to the ground state always requires
Vilka [71]

Answer:

c. emission of electromagnetic radiation.

Explanation:

When an atom changes its state from an excited one to the ground state, it means that the atom is changing from a state with higher energy to a state of lower energy.

This can occur, for instance, in the presence of an electronic transition (an electron moving from a higher energy level to a lower energy state) or of a nuclear transition (the nucleus get de-excited). In both cases, since the total energy must be conserved, there must be energy released. This energy is released as a photon (electromagnetic radiation), whose energy is equal to the difference between the two energy levels involved in the transition.

6 0
3 years ago
A tiger leaps from a rock 15 meters off the ground with a horizontal velocity of 4.5m/s. How far away from the rock will the tig
larisa [96]

Answer: it will take 8.33s for the tiger to land

Explanation:

4 0
4 years ago
action and reaction are equal in magnitude and opposite direction then why they don't balance each other
Harrizon [31]
Action and reaction are equal in magnitude and opposite direction by they don't balance each other because they don't occur on the same body. Action is involved on one body and reaction is involved on another body.
Hope you understood...
8 0
3 years ago
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