PHYSICS HIGH SCHOOL

The earth has a downward-directed electric field near its surface of about 150 N>C. If a raindrop with a diameter of 0.020 mm is suspended, motionless, in this field, how many excess electrons must it have on its surface?

Answers

Answer 1

Answer:

Answer:

$Q = 2.74 * 10^(-13) C$

Explanation:

A rain drop has diameter given as

$d = 0.020 mm$

so the radius of the rain drop will be

$R = 0.010 mm$

now the volume of the rain drop is given as

$V = (4)/(3)\pi R^3$

$V = (4)/(3)\pi(0.010* 10^(-3))^3$

$V = 4.19 * 10^(-15) m^3$

now weight of the rain drop is given as

$W = \rho V g$

$W = (1000)(4.19 * 10^(-15))(9.81)$

$W = 4.11 * 10^(-11) N$

now this weight of the rain drop is counterbalanced by force due to electric field

so we have

$QE = W$

$Q = (W)/(E)$

$Q = (4.11 * 10^(-11))/(150)$

$Q = 2.74 * 10^(-13) C$

Answer 2

Answer:

Final answer:

To determine the number of excess electrons on the surface of the raindrop, we can use the formula: mdrop = qeE. The electric field near the Earth's surface is given as 150 N/C. The mass of the raindrop can be calculated using its diameter.

Explanation:

To determine the number of excess electrons on the surface of the raindrop, we can use the formula:
mdrop = qeE

The electric field near the Earth's surface is given as 150 N/C. The mass of the raindrop can be calculated using its diameter. Once we have the mass, we can solve for the charge (qe) to find the number of excess electrons on its surface.

Let me calculate that for you.

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If you notice that two waves combine and a part of the resulting wave has less light intensity than either of the individual waves, you're observing A. destructive interference. B. polarization. C. constructive interference. D. diffraction.

Answers

If you notice that two waves combine and a part of the resulting wave has less light intensity than either of the individual waves, you're observing destructive interference. Destructive interference happens when the two waves that combine have amplitudes with opposite signs,which results in subtraction- combined wave with a lower amplitude.

A signal from the nervous system that is sent from the brain to the hand would follow a different pathway than a signal sent from the hand to the brain.

Answers

Answer:

FALSE!! ❌❌❌

Explanation:

The brain sends messages via the spinal cord to the body's peripheral nerves, which control the muscles and internal organs. ... The brain sends messages via the spinal cord to peripheral nerves throughout the body that serve to control the muscles and internal organs.

In conclude the answer is FALSE!❌❌❌

Bonus** In Ed Is false

Hope this helps! ✔

Final answer:

A signal from the brain to the hand follows an efferent pathway through the spinal cord, while a signal from the hand to the brain follows an afferent pathway through the spinal cord.

Explanation:

The nervous system is responsible for sending signals between the brain and different parts of the body. When a signal is sent from the brain to the hand, it follows a pathway called the efferent pathway. This pathway involves the signal traveling from the brain, through the spinal cord, and then to the hand. On the other hand, when a signal is sent from the hand to the brain, it follows a pathway called the afferent pathway. This pathway involves the signal traveling from the hand, through the spinal cord, and then to the brain.

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You have two pieces of wire that allows electrons to pass through them when they are connected to each other. If you insert a piece of rubber between the wires, the electrons do not flow. The rubber material is ??

Answers

An insulator of electricity

The city police are in pursuit of Robin Banks after his recent holdup at the savings and loan. The high-speed police chase ends at an intersection as a 2080-kg Ford Explorer (driven by Robin) traveling north at 22.6 m/s collides with a 18400-kg garbage truck moving east at 10.4 m/s. The Explorer and the garbage truck entangle together in the middle of the intersection and move as a single object. Determine the post-collision speed and direction of the two entangled vehicles.

Answers

Answer:

$v=9.6215m/s\n\theta=13.8^o$

Explanation:

This problem is an example of a perfectly inelastic collision. After the collision, the two cars merge into a single object. So in order to find the velocity of that object, we need to find the velocity of the center of mass of the given system of 2 cars.

Mass of Ford = $m_F$ = 2080 kg

Mass of truck = $m_T$ = 18400 kg

Velocity of Ford = $v_F$ = 22.6 m/s north

Velocity of truck = $v_T$ = 10.4 m/s east

Let us break up the velocity vector into 2 components, one along north ( $v_N$ ) and one along east ( $v_E$ ).

Therefore,

$v_N=(m_Fv_F_(north)+m_Tv_T_(north))/(m_F+m_T) =((2080*22.6)+(18400*0))/(2080+18400) =2.2953m/s$

(speed of truck along the north is zero)

Similarly,

$v_E=(m_Fv_F_(east)+m_Tv_T_(east))/(m_F+m_T) =((2080*0)+(18400*10.4))/(2080+18400) =9.3437m/s$

(speed of Ford along the east is zero)

Hence, the resultant speed of the entangled cars is given by,

$v=√(v_N^2+v_E^2) =√(2.2953^2+9.3437^2)m/s=9.6215 m/s$

and the direction is given by (please refer to the figure attached),

$\theta=tan^(-1)((v_N)/(v_E) )=tan^(-1)((2.2953)/(9.3437) )=13.8^o$

Final answer:

The post-collision speed and direction of the two entangled vehicles, calculated using principles of momentum conservation and trigonometry, are found to be 9.82 m/s and 76.4 degrees east of north respectively.

Explanation:

In this scenario, we are dealing with the principles of momentum conservation. In a collision like this one, the total momentum before the collision equals the total momentum after the collision, as long as no external forces are acting on the system. The momentum (p) of an object is calculated as the mass (m) of the object multiplied by its velocity (v), or p=mv.

Before the collision, the total momentum of the system (ptotal) is the sum of the momentum of the Ford Explorer (pExplorer) and the garbage truck (ptruck). After the collision, they move together as a single object, so their combined mass and velocity would make up the total momentum.

Based on the given information, pExplorer = 2080 kg * 22.6 m/s = 47,008 kg*m/s and ptruck = 18400 kg * 10.4 m/s = 191,360 kg*m/s. The direction should also be taken into account. Since they are perpendicular to each other, we can use the Pythagorean Theorem to find the resultant momentum: (pExplorer)^2 + (ptruck)^2 = ptotal^2, which gives a total momentum of 201,262.8 kg*m/s.

Now, the total mass (mtotal) of two entangled vehicles is 2080 kg + 18400 kg = 20480 kg. Hence the velocity (v) of the two vehicles after the collision is calulated by ptotal divided by mtotal : 201262.8 kg*m/s / 20480 kg = 9.82 m/s. The direction is calculated using trigonometrics such as tan(-1)(ptruck / pExplorer) which gives a direction of 76.4 degrees east of north.

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How could i design an experiment to test the speed of sound in different materials such as fabric, cardboard, steel, aluminum, plastic.

Answers

To design an experiment to test the speed of sound in different materials, you could use a speaker and a microphone to measure the time it takes for sound to travel through each material. First, you would need to set up the speaker and microphone on opposite sides of each material and measure the distance between them. Then, you would play a sound from the speaker and measure the time it takes for the sound to reach the microphone. You could repeat this process for each material and use the data to calculate the speed of sound in each material. Additionally, you could compare your results to the known speed of sound in air (343 m/s) to see how the materials affect the speed of sound.

Which of the following describes something through which objects can be seen clearly?translucent

opaque

transparent

obtuse

Plz help me and my lil sis suck at sience :P

Answers

Its Transparent. While Transparent, Opaque, and Translucent are all able to let light through only Transparent allows objects on the other side to be clearly seen. Also Obtuse means insensitive, Slow to understand or greater than 90degrees but less than 180degrees. Hope this helps.

Answer:

It is translucent

Explanation: i put it and got it right

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