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2 years ago

11

. Calculate the time take and the distance covered by a train moving with a velocity of 15 m/s to accelerate uniformly at the ra

te of 2 m/s^2 to reach a velocity of 20 m/s.

1 answer:

Oksi-84 [34.3K]2 years ago

6 0

Answer:

a = (V2 - V1) / t for uniform acceleration

t = (20 - 15/ m/s / 2 m/s^2 = 2.5 s

S = V1 t + 1/2 a t^2 distance covered

S = 15 * 2.5 + 2 / 2 * 2.5^2 = 37.5 + 2.5*2

S = 37.5 + 6.25 = 43.75 m

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Under which conditions do both convex and concave mirrors form virtual images? State whether or not each can form a real image.

-Dominant- [34]

Hi!

Convex mirrors always form virtual images regardless of object position and the image is formed behind the mirror in both cases I.e. at infinity and between infinity and the pole. The image is diminished in both the cases.

Concave mirrors form a virtual image when the object is placed in between the Principal focus and the Pole and the image is formed behind the mirror. The virtual image is enlarged in this case. In all other object positions I.e. at infinity, beyond Center of curvature, at Center,between centre of curvature and principal focus and at principal focus, a real and an inverted image of the object is formed.
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3 years ago

The front and rear sprockets on a bicycle have radii of 8.40 and 4.91 cm, respectively. The angular speed of the front sprocket

Rudik [331]

Explanation:

It is given that,

Radius of the front sprockets, $r_f=8.4\ cm=0.084\ m$

Radius of the rear sprockets, $r_r=4.91\ cm=0.0491\ m$

The angular speed of the front sprocket is 12.3 rad/s, $\omega_f=12.3\ rad/s$

(a) Linear speed of the front sprockets, $v_f=r_f\times \omega$

$v_f=0.084\times 12.3$

$v_f=1.0332\ m/s$

$v_f=103.32\ cm/s$

Linear speed of the rear sprockets, $v_r=r_r\times \omega$

$v_r=0.0491\times 12.3$

$v_r=0.60393\ m/s$

$v_r=60.393\ cm/s$

(b) Let $a_r$ is the centripetal acceleration of the chain as it passes around the rear sprocket.

$a_r=\dfrac{v_r^2}{r_r}$

$a_r=\dfrac{(60.393)^2}{0.0491}$

$a_r=74283.39\ m/s^2$

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`Hence, this is the required solution.

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3 years ago

Read 2 more answers

Please help! 100 points!

gregori [183]

Answer:

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The second question im not sure sorry- the positive and negative one ;(

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People affect the physical environment in numerous ways: overpopulation, contamination, burning fossil powers, and deforestation. Changes like these have activated climate alter, soil disintegration, destitute discuss quality, and undrinkable water. Earth's surface is the as it were territory accessible to the human race. Understanding the forms by which that environment has been made and persistently changed is critical to decide the causes of natural degradation.

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3 years ago

What type of energy requires the motion of an object?

hichkok12 [17]

Answer:

Mechanical Energy.

Explanation:

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3 years ago

_____________________ are structures in cardiac muscle tissue that allow impulses to spread across the heart more rapidly.

Darya [45]

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3 years ago