How does the use of mobile phones affect the stopping distance of a vehicle?

Answers

Answer 1

Answer: when a driver is using a phone,they pay less attention to the road and are less able to notice any changes

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Consider a room that is initially at the outdoor temperature of 20°C. The room contains a 40-W light bulb, a 110-W TV set, a 300-W refrigerator, and a 1110-W iron. Assuming no heat transfer through the walls, determine the rate of increase of the energy content of the room when all of these electric devices are on.
Describe the difference between the currents that exist in the wires leading to a capacitor when these wires are connected to (a) a DC source and (b) an AC source.
Explain why dissolving is a physical change
When you add heat to wood it burns. The cellulose that makes up wood is converted to carbon dioxide, water vapor, and ash. This transfer of energy caused a change to the _____ of wood. chemical properties physical properties internal properties
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If we assume that 60 % of the kinetic energy delivered by a 1.80-kg hammer with a speed of 7.80 m/s is transformed into heat that flows into the nail and does not flow out, what is the temperature increase of an 8.00-g aluminum nail after it is struck ten times?

Answers

Answer:

45.6°C

Explanation:

Kinetic energy = $(1)/(2)mv^2$

Use m= 1.80kg and v=7.80m/s (mass and speed of hammer).

K = 0,5*1.80kg*(7.80m/s)^2 = K=54.8J

Heat is 60% of Kinetic energy. Q = 0.6*54.8J = 32.9J

As it is stuck 10 times the total heat is 10*32.9J = Total Heat = 329J

Use the equation $Q = mC_v \Delta T$ to find change of temperature:

$\Delta T = (Q)/(mC_v)$

Q = 329J; m = 8.00g of aluminium; C_v = 0.900J/g°C (For aluminium)

$\Delta T = (329J)/(8.00g*0.900J/g°C)$

Calculating gives Change of Temperature = 45.6°C

What is the value of current when the voltage is 8 volts

Answers

That depends on the resistance between the ends of the voltage.

Si el sonido no atraviesa las paredes entonces, ¿por qué se escuchan las voces de los vendedores dentro de nuestra casa aún cuando las puertas y las ventanas estén cerradas?

Answers

Answer:

DE HECHO EL SONIDO DÍ PUEDE ATRAVESAR LAS PAREDES, PERO

CUANDO ENTRA EN LA PARED, EL SONIDO VIAJA MÁS RÁPIDO QUE EN EL

AIRE Y CUANDO SALE DEL OTRO LADO, EL SONIDO VA A UNA

VELOCIDAD ALTA, POR ESTO LSA VOCES SE ESCUCHAN AUNQUE NO

MUY CLARAS.

Explanation:

Every charged particle produces ?

Answers

Every charged particle produces a magnetic field.

PLZ EXPLAIN THE EQUATION AND I WILL GIVE BRAINLIST You are out and about in the country and your father sees a rock that he really wants in the yard. Now you must get the very heavy rock into the back of a truck. The truck bed is 3 feet off the ground. Your father pulls out a 5-foot plank and begins to set up a ramp. At the same time, you (who know about mechanical advantage!) have found a plank that is 8 feet long, and you show it to your father. Which plank will give you the most mechanical advantage? Calculate the MA for each plank

Answers

Answer:

The 8 foot long plank

Explanation: hope this helps :)

A coil of insulated wire is wound many times around an iron bar. The wire is connected to a battery and a contact switch. The contact switch is alternately flipped closed and left closed, so the wire carries a current through it, and then flipped open and left open, so that the current stops. Describe what magnetic fields are created, if those magnetic fields in turn induce an emf, and whether the induced emf is in the direction of the original current or opposite to it. Justify your answer using Lenz's law and the conditions which can cause a magnetic field to induce an emf. You may draw a diagram if it helps you to visualize the apparatus.

Answers

Answer:

As per faraday's law the rate of change in magnetic flux linked with a coil will induce EMF in the coil. It is given by

$E = - (d\phi)/(dt)$

now here as we are closing the switch and then open it alternatively so it will change the value of current in the coil.

This change in current will change the magnetic flux in the coil due to which it will induce EMF in it.

Now by Lenz the the direction of induce current in the coil will always opposite to the causes due to which it is induced.

As we know that when switch is connected to flow the current the direction of induced current is in opposite to the current so that it will oppose the increasing value of current while when we open the switch the induced current is in direction of the current so that it will increase the value of decreasing current in the loop.

The induced emf is in the direction opposite to the direction of current.

What is induced emf?

Emf is the production of a potential difference in a coil as a result of changes in the magnetic flux passing through it.

When the flux coupling with a conductor or coil changes, electromotive Force, or EMF, is said to be induced.

The rate of change in magnetic flux linked to a coil will induce EMF in the coil, according to Faraday's law.

Now, when we alternately close and open the switch, the current in the coil will change.The magnetic flux in the coil will vary as a result of the change in current, resulting in EMF in the coil.

Now, according to Lenz, the direction of induce current in the coil will always be the polar opposite of the causes.

Hence the induced emf is in the direction opposite to the direction of current.

To learn more about the induced emf, refer to the link;

brainly.com/question/16764848

#SPJ2

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