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3 years ago

What is the purpose of a rear view mirror in a car?

Physics

1 answer:

Nat2105 [25]3 years ago

3 0

The purpose of a rear view mirror in a car is to see behind the car, if there is any car coning or not.

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Two identical conducting spheres, A and B, carry equal charge. They are separated by a distance much larger than their diameters

Vesnalui [34]

Answer:

C. $\frac{3F}{8}$

Explanation:

Let initial charges on both spheres be, $q$

$F=\frac{Kq^2}{d^2} \ \ \ \ \ \ \ \ \ \ \_i$

When the sphere C is touched by A, the final charges on both will be, $\frac{q}{2}$

#Now, when C is touched by B, the final charges on both of them will be:

$q_c=q_d=\frac{q/2+q}{2}\\\\=\frac{3q}{4}\\$

Now the force between A and B is calculated as:

$F\prime=\frac{k\times\frac{q}{2}\times \frac{3q}{4}}{d^2}\\F\prime=\frac{3F}{8}$

Hence the electrostatic force becomes 3F/8

4 0

3 years ago

A 5 kg object slows from +6 m/s to +2 m/s. What is the impulse?

Liula [17]

Impulse on the object: -20 kg m/s

Explanation:

The impulse exerted on an object is a vector quantity equal to the product between the force exerted on the object and the time interval during which the force is applied.

The impulse exerted on an object is also equal to its change in momentum. Mathematically,

$I=\Delta p = m(v-u)$

where:

m is the mass of the object

u is the initial velocity

v is the final velocity

For the object in this problem, we have

m = 5 kg

u = +6 m/s

v = +2 m/s

Therefore, its impulse is:

$I=(5)(+2-(+6))=-20 kg m/s$

The negative sign means the direction of the impulse is opposite to the direction of motion of the object.

Learn more about impulse:

brainly.com/question/9484203

#LearnwithBrainly

5 0

3 years ago

Heat energy is transferred by conduction whenever molecules?

Rama09 [41]

The heat transfer by conduction occurs due to the collision between the molecules in the substance.

Explanation:

The heat transfer between the substances or in a medium is carried out by means of three methods.

Conduction
Convection
Radiation

The conduction is the process of transfer of heat within the substance by transferring the heat one by one to each molecule throughout the substance by colliding with the neighboring molecule. This method prevails in the transfer of heat in the solids.

The convection is the process of transfer of heat in which the source of heat is used to heat a particular bunch of molecules or a layer of the substance and then that layer moves away from the source and lets other molecule to come close to the layer. This method of heating is used in liquids.

The radiation is the process of transfer of heat in the medium by means of the energy carried by the radiation. This process of heating is used for the heating of the gases in the medium.

Thus, The heat transfer by conduction occurs due to the collision between the molecules in the substance.

Learn More:

1. Which one is a compound machine brainly.com/question/9060219

2. Equinoxes occur when brainly.com/question/1000562

3. Explanation for the salinity of ocean water brainly.com/question/2752734

Answer Details:

Grade: Middle School

Subject: Physics

Chapter: Heat transfer

Keywords:

heat energy, transferred, conduction, convection, radiation, molecules, solids, liquids, medium, substance, transfer.

8 0

3 years ago

Read 2 more answers

A car reversing at -7.2 m/s has a displacement of -21.6 m. How long did this take?

weeeeeb [17]

Answer:

Time=distance/velocity

T=S/V

T=(-21.6)/(-7.2)

Time=3seconds

4 0

3 years ago

Which best describes cosmic microwave background radiation

balu736 [363]

The cosmic microwave background (CMB) is electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology. In older literature, the CMB is also variously known as cosmic microwave background radiation (CMBR) or "relic radiation"

5 0

3 years ago

Read 2 more answers