A body of mass 2 kg is moving in the positive X-Direction with a speed of 4 m/s collides head on with an another body of mass 3 kg moving in the negative X-Direction with a speed of 1 m/s . During collision a loud sound is heard and they both start moving together . the sound energy cannot be greater than :A) 12 J
B) 14 J
C) 15 J
D) 17.5 J

Answers

Answer 1

Answer: $m_1=2 \n m_2=3 \n v_1=4 \n v_2=1 \n v\text{ =speed after collision (to be determined)}.$

The momentul of the system preserves:

$m_1v_1-m_2v_2=(m_1+m_2)v \ \ \ \ \ \Rightarrow \ \ \ \ \ v=(m_1v_1-m_2v_2)/(m_1+m_2).$

Ok, we found the speed after the collision.
Now, because the impact is plastic, it produces heat, sound energy and who knows what other forms of energy. We denote all this wasted energy with $E$ .

Now, we write the energy conservation law:

$(m_1v_1^2)/(2)+(m_2v^2_2)/(2)=((m_1+m_2)v^2)/(2)+E$

From the above equation, you find $E$ , and then conclude that the sound energy can certainly not be greater than this.

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What occurs when a swimmer pushes through the water to swim?

Answers

The correct answer to the question is that water will exert a force on the swimmer in forward direction, and swimmer will move along that direction.

EXPLANATION:

Before going to answer this question, first we have to understand Newton's third laws of motion.

Newton's third laws of motion states that, for every action, there is an equal and opposite reaction.

In the given question, the swimmer pushes the water in backward direction. This is the force of action. As per Newton's third law, the water must exert a reaction on the swimmer. The water applies a force on the swimmer in forward direction for which the swimmer can swim in the water.

When a swimmer pushes threw water to swim they are propelled forward because of the water resistance against the hand and feet.

an 11 ohm resistor and a 6 ohm resistor are connected in series with a battery. the potential difference across the 6 ohm resistor is 9 volts. find the potential difference across the battery

Answers

Two resistors in series are often called a 'voltage divider', because the
total voltage divides in proportion to the resistances.

The total resistance in the string across the battery is (11 + 6) = 17 ohms.

-- The full battery voltage appears across 17 ohms.
-- The voltage across the 11-ohms is (11/17) of the battery, and
-- the voltage across the 6-ohms is (6/17) of the battery.

(6/17) x (B) = 9 volts

Multiply each side by (17/6) : B = (9 volts) x (17/6) = 25.5 volts .

By the way, in case you care or are asked . . .

-- The current in the whole series loop is B/R = 25.5 / 17 = 1.5 Amperes
-- The power drawn from the battery is B²/R = (25.5)²/17 = 38.25 watts
-- The power dissipated by the 6-ohm resistor is V²/R = 9²/6 = 13.5 watts
-- The power dissipated by the 11-ohm resistor is I²R = (1.5)² (11) = 24.75W
-- (Check: 13.5W + 24.75W = 38.25W yay! )
-- If they're just composition units hanging out in the air, then both resistors
are getting quite warm.

Select all that apply.A vector always consists of _____.

A) a force
B) mass
C) size
D) direction

Answers

C) size and D) direction
Vector quantities possess both size and direction while scalars possess only size.

Answer:The correct options are (C)and (D) are correct.

Explanation:

A vector is defined as quantity which have magnitude and direction. it is represented by the arrow whose direction is same as that of the quantity.Fro example : velocity, force, acceleration , work done etc.

Magnitude is a term which means size or extent or importance of something.

From this we can conclude that vectors always consists of direction and size(magnitude). Hence options(C)and (D) are correct.

A particle is moving along the x-axis so that its position at any time t is greater than and equal to 0 is given by x(t)=2te^-t?A) Find v(t).

B) Find a(t).

C) At t=0, is the particle slowing down or speeding up? Explain.

D) At what time(s), if any, does the particle change directions? Justify your answer.

Any help would be GREATLY appreciated! Thank you!!!

Answers

for speed you can differentiate the equation, for acceleration you can again differentiate the equation .
at t=0 the particle is slowing down , when you get equation for velocity put t=0 then only -1 is left

What temperature is required to transfer waste heat to the environment for a heat engine to be 100 percent efficient?

Answers

This can be seen as a trick question because heat engines can typically never be 100 percent efficient. This is due to the presence of inefficiencies such as friction and heat loss to the environment. Even the best heat engines can only go up to around 50% efficiency.

Answer:

An infinite temperature

Explanation:

The efficiency of an engine is defined as:

$\eta=1 -(T_C)/(T_H)$

where

$T_H$ is the temperature at which heat enters the engine

$T_C$ is the temperature of the environment, to which the engine exhausts heat

From the formula, we see that for an engine to be 100% efficient, the fraction

$(T_C)/(T_H)$

must be equal to zero. Since the value of $T_C$ is never zero (the temperature is expressed in Kelvin, and the temperature of the environment can never be exactly 0 K), the only possibility for that to occur is that the temperature at which heat enters the engine ( $T_H$ ) is infinite, so that this fraction becomes zero and the efficiency becomes 1.

Which of the following occurs when the fight-or-flight response is triggered?

Answers

Answer:

A or B

Explanation:

The autonomic nervous system has two components, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers.

Final answer:

The fight-or-flight response is a physiological reaction triggered by a perceived threat or danger. It prepares the body for action by releasing stress hormones and increasing heart rate. This response helps individuals to either fight the threat or flee from it.

Explanation:

The fight-or-flight response is a physiological reaction that occurs in response to a perceived threat or danger. When triggered, the body releases stress hormones like adrenaline and cortisol, which prepare the body for action.

This response can help increase heart rate, dilated pupils, and redirect blood flow to the muscles, enabling the individual to either fight the threat or flee from it.

Learn more about Fight-or-flight response here:

brainly.com/question/33605762

#SPJ6

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