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3 years ago

Calculate the acceleration of a bus whose speed changes from 6 m/s to 12 m/s over a period of 3 s.

Physics

1 answer:

labwork [276]3 years ago

3 0

Answer:

Answer is: Acceleration=2 m/s^2

Explanation:

Given:

Initial velocity: 6 m/s

final velocity: 12 m/s

Time: 3 s

The formula: final velocity - initial velocity ÷ time

So,

12 m/s - 6 m/s ÷ 3 s

6 m/s ÷ 3 s

= 2 m/s^2

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3 years ago

As outlaws escape in their getaway ear, which goes 3/4 c, the police officer fires a bullet from a pursuit ear, which only goes

Mariulka [41]

Answer:

a) Bullet will hit

b) Bullets will not hit

Explanation:

Given:

The velocity of the bullet, u = $\frac{1}{3}c$ in the rest frame of the bullet pursuit car

The velocity of the original frame of reference, v = $-\frac{1}{2}c$ with respect to the pursuit car.

Now, according to the Galileo

the velocity of the bullet in the original frame of reference (u') will be

u' = u - v

on substituting the values we get

u' = $\frac{1}{3}c-(-\frac{1}{2}c)$

u' = $\frac{1}{3}c+\frac{1}{2}c$

u' = $\frac{5}{6}c$

since this velocity ( $\frac{5}{6}c$ ) is greater than the ( $\frac{3}{4}c$ )

hence,

the bullet will hit

Now, according to the Einstein theory

the velocity of the bullet in the original frame of reference (u') will be

$u'=\frac{u-v}{1-\frac{uv}{c^2}}$

on substituting the values we get

$u'=\frac{\frac{1}{3}c-\frac{1}{2}c}{1-\frac{\frac{1}{3}c\times \frac{1}{2}c}{c^2}}$

$u'=\frac{\frac{5}{6}c}{1-\frac{1}{6}}$

$u'=\frac{5}{7}c$

since,

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7 0

4 years ago

The strength of the Earth’s magnetic field B at the equator is approximately equal to 5 × 10−5 T. The force on a charge q moving

Blizzard [7]

Answer:

$2.4\cdot 10^{-11} N$

Explanation:

Since the Earth's magnetic field is perpendicular to your direction of motion, the strength of the magnetic force exerted on your head is given by:

$F=qvB$

where:

$q=6\cdot 10^{-9}C$ is the charge on your head

$v=80 m/s$ is the speed at which you are moving

$B=5\cdot 10^{-5} T$ is the strength of the magnetic field of the Earth

By substituting these numbers into the equation, we find the strength of the magnetic force:

$F=(6\cdot 10^{-9}C)(80 m/s)(5\cdot 10^{-5} T)=2.4\cdot 10^{-11} N$

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3 years ago

Two samples of aluminum foil, 27 grams and 54 grams, are cut out from a roll. Which of the following properties is different for

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Before answering this question, you must know the concept between extensive and intensive property. The extensive property does not depend on the amount of substance (like mass), which is the opposite of intensive properties. From the given choices, the rest are extensive properties except for amount of matter. Hence, that is the answer.

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4 years ago

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True or false? a Movable pulley does not provide mechanical advantage. False True

shepuryov [24]

Answer:

i think its false i hope u get it correct

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3 years ago