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4 years ago

A bus trip covers 191 km and takes 4 hours and 15 minutes. What is the average speed of the bus in kilometers per hour?

Physics

1 answer:

kirill [66]4 years ago

3 0

Answer: 46 kph

Explanation:

191 ÷ 4.15 = 46.02

It might not be right

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Where in a horseshoe magnet is the magnetic field maximum??

Kazeer [188]

In a Horsehoe magnet, maximum magnetic field is concentrated between the poles.

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3 years ago

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shusha [124]

Answer: The unit of impulse is applied to an object produces an equivalent vector change in its linear momentum, also in the same direction.

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3 years ago

In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is

Alchen [17]

Answer:

(a) Electric force will be $77.285\times 10^{-9}N$

(B) Velocity $v=2.1522\times 10^6m/sec$

Explanation:

We have given that radius of the circular orbit $r=0.546\times 10^{-10}m$

Charge on electron $e=1.6\times 10^{-19}C$

(A) According to coulomb's law electric force between two charges is given by

$F=\frac{kq}{r^2}$

So electric force $F=\frac{9\times 10^9\times (1.6\times 10^{-19})^2}{(0.546\times 10^{-10})^2}=77.285\times 10^{-9}N$

We know that centripetal force is given by $F=\frac{mv^2}{r}$

So $\frac{9.11\times 10^{-31}\times v^2}{0.546\times 10^{-10}}=77.285\times 10^{-9}$

$v=2.1522\times 10^6m/sec$

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3 years ago

A ray diagram is shown what does the letter x represent?

nlexa [21]

Answer: angle of incidence

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3 years ago

If the coefficient of kinetic friction is 0.43 for a box sliding across your lab table and the

ValentinkaMS [17]

Answer:

3.2N

Explanation:

Given parameters:

Coefficient of kinetic friction = 0.43

Weight of box = 7.4N

Unknown:

Force of kinetic friction = ?

Solution:

The force of kinetic friction is given as:

Force of kinetic friction = UN

U is the coefficient of friction

N is the weight

Force of kinetic friction = 0.43 x 7.4 = 3.2N

3 0

3 years ago