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s344n2d4d5 [400]

3 years ago

9

a 1000 kg car crashed into bearer . the car changed speed from 30 m/s to 20 m/s in 2 seconds . What force did the bearer apply t

o stop the car?

2 answers:

ladessa [460]3 years ago

7 0

The bearer used an opposite force to slow down the car

Allushta [10]3 years ago

3 0

The bearer used an opposite force to slow the car.

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Waves with higher amplitude transfer ____energy.

natali 33 [55]

Answer:

- Waves with higher amplitude transfer HIGHER energy.

- Waves with higher frequency transfer HIGHER energy.

3 0

3 years ago

Explain what voltage,current, resistance are and how they relate to Ohms law. Then give examples

SOVA2 [1]

Voltage is the difference in charge between two points.
Current is the rate the charge flows
Resistance is the tendency a material has to resist the flow of charge (current)
Combining voltage resistance and current Ohm developed the formula
V (Voltage)= I (Current) x R (Resistance)

3 0

4 years ago

An electron is accelerated from rest by a potential difference of 412 V. It then enters a uniform magnetic field of magnitude 18

Salsk061 [2.6K]

Explanation:

Given that,

Potential difference, V = 412 V

Magnitude of magnetic field, B = 188 mT

(a) The potential energy of electron is balanced by its kinetic energy as :

$eV=\dfrac{1}{2}mv^2$

v is speed of the electron

$v=\sqrt{\dfrac{2eV}{m}} \\\\v=\sqrt{\dfrac{2\times 1.6\times 10^{-19}\times 412}{9.1\times 10^{-31}}} \\\\v=1.2\times 10^7\ m/s$

(b) When the charged particle moves in magnetic field, it will move in circular path. The radius of the circular path is given by :

$r=\dfrac{mv}{eB}\\\\r=\dfrac{9.1\times 10^{-31}\times 1.2\times 10^7}{1.6\times 10^{-19}\times 188\times 10^{-3}}\\\\r=3.63\times 10^{-4}\ m$

Hence, this is the required solution.

7 0

3 years ago

Germanium to which 1024 m-3 Ga atoms have been added is an extrinsic semiconductor at room temperature, and virtually all the Ga

Svetlanka [38]

Answer:

Electrical Conductivity is 3200 $(\Omega m)^{-1}$

Solution:

As per the question:

$N_{A} = 10^{24}\ m^{- 3}\ Ga\ atoms$

Mobility of electrons, $\mu_{e} = 0.26\ m^{2}/ Vs$

Mobility of holes, $\mu_{h} = 0.020\ m^{2}/ Vs$

Charge, Q = $1.6\times 10^{- 19}\ C$

Now,

The formula for the conductivity is given by:

$\sigma = N_{A}Q\mu_{h}$

$\sigma = 10^{24}\times 1.6\times 10^{- 19}\times 0.020} = 3200(\Omega m)^{-1}$

5 0

3 years ago

Hydrogen cyanide (HCN) is a product of combustion that:

bekas [8.4K]

b. is equally as toxic as carbon monoxide (CO).

Explanation:

Hydrogen Cyanide is a product of combustion that is equally as toxic as carbon monoxide CO.

The gas is a product of combustion in blast furnances, coke ovens, e.t.c

Just like carbon monoxide, they are blood agents that are toxic in the body
Prolonged exposure to hydrogen cyanide can lead to death eventually.
The gas is a able to produce cyanide ion that seriously impacts the process of cellular respiration and bringing it to a halt.
It is listed as one of the dangerous chemical weapons.

Learn more:

Safety data sheets brainly.com/question/2188622

#learnwithBrainly

5 0

3 years ago