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3 years ago

10

While traveling north on an expressway, a car traveling 60 mph (miles per hour) slows down to 30 mph in 12 minutes due to traffi

c conditions. Calculate the acceleration.

1 answer:

Damm [24]3 years ago

8 0

30mph-60mph/12minutes turns to -30mph/12minutes which equal and acceleration of -2.5mph per minute

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If a 70-kg swimmer pushed off a pool wall with a force of 250N at what rate will the swimmer accelerate from the wall

Vlad [161]

F = ma
250 = 70 x a
a = 250/70
a = 3.57

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3 years ago

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PIT_PIT [208]

Answer:

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Explanation:

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2 years ago

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How to find acceleration?

Yanka [14]

Acceleration = Change in Velocity / time

a = (v - u) / t

Where v = final velocity in m/s
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t = time in seconds.
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A proper record of the changes in velocity with the corresponding time would help find the acceleration.

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2 years ago

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At a location near the equator, the earth’s magnetic field is horizontal and points north. An electron is moving vertically upwa

ivann1987 [24]

Answer:

(b) EAST

Explanation:

you can assume that the magnetic field points rightward, that is, in the positive x direction (NORTH). Furthermore, you can assume that the direction of the motion of the electron is in the positive y direction. Hence, you have:

$\vec{B}=B_o\hat{i}\\\\\vec{v}=v_o\hat{j}$

You use the Lorentz formula to known which is the direction of the magnetic force over the electron:

$F=qv\ X\ B$

which implies the cross product between the unitary vecors j and i, that is

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3 years ago

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Light incident upon a pane of glass slows down in passing through the glass, Does it emerge at a slower speed or at its initial

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Answer:

It will emerge at its initial speed not a slower speed.

Explanation:

It will emerge at the initial speed because the medium at the point of emergence is the same as the medium before incidence.

Light moves at a constant speed in any particular medium. Hence, the speed of light in air is constant in air and the speed of light in glass is constant in glass.

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2 years ago