3 years ago

Momentum=mass X velocity

Physics

1 answer:

Sliva [168]3 years ago

6 0

Answer:

Hope it helped

stay safe, mark BRAINLIEST

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Seeing a police officer ahead and not being sure of the speed limit, a driver slows from 65 mi/hr to 55 mi/hr in 4.0 seconds, tr

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Answer:

$-1.13 m/s^2$

Explanation:

The acceleration of the car is given by:

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time

Here we have to convert the velocities from mi/hr to m/s. Keeping in mind that

1 mi = 1609 m

1 h = 3600 s

We get:

$u = 65 mi/h \cdot \frac{1609}{3600}=29.1 m/s\\v = 55 mi/h \cdot \frac{1609}{3600}=24.6 m/s$

While the time interval is

t = 4.0 s

Substituting,

$a=\frac{24.6 - 29.1}{4.0}=-1.13 m/s^2$

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3 years ago

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irina1246 [14]

Explanation:

Let us assume that Z is the energy transported across an area of $1.00 cm^{2}$ per hour by an electromagnetic wave with an r.m.s speed of 21.5 V/m.

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Therefore, we can conclude that 0.441 J energy is transported across a given EM wave.

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