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4 years ago

A car with a leftward velocity and a rightward acceleration is

1 answer:

3 0

A car with leftward velocity and a rightward acceleration will move left and slowing down. Because whenever a car moves in a specific direction, then by applying an opposite acceleration or brakes won’t make its direction spontaneously in the direction of applied brakes or acceleration, but it will first slow down the car, and then make it stop due to applied brakes and then moves it in the direction of applied acceleration.

<span>So option “B” is correct. </span>

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What is responsible for the hole in the ozone layer?

Vaselesa [24]

CFCs, carbon dioxide, green house gases and it's effects are responsible for the hole in ozone layer.

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3 years ago

Read 2 more answers

A hammer taps on the end of a 4.10-m-long metal bar at room temperature. A microphone at the other end of the bar picks up two p

xz_007 [3.2K]

Answer:

Speed of sound inside metal is ≅ 8200 $\frac{m}{s}$

Explanation:

Given :

Length of metal bar $x = 4.10$ m

From general velocity equation,

$v = \frac{x}{t}$

Where $v =$ speed of sound in air = 343 $\frac{m}{s}$

For finding time from above equation,

$t = \frac{x}{v}$

$t = \frac{4}{343}$

$t = 0.01166$ sec

Since pulses are separated by $t_{o} =$ $11.1 \times 10^{-3} = 0.0111$ sec

So we take time difference,

$\Delta t = t_{} -t_{o} = 0.0005$

So speed of sound in metal is,

$v = \frac{x}{\Delta t }$

$v = \frac{4.10}{0.0005}$

$v = 8200$ $\frac{m}{s}$

4 0

3 years ago

An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the pos

disa [49]

The sign associated with the average velocity of the object is negative.

<h3>Average velocity of the object</h3>

The average velocity of the object is calculated as follows;

Average velocity = (v1 + v2)/2

v1 = -20/30 = -0.667 m/s

v2 = 20/50 = 0.4 m/s

Average velocity = (-0.667 + 0.4)/2

Average velocity = -0.134 m/s

Thus, the sign associated with the average velocity of the object is negative.

Learn more about average velocity here: brainly.com/question/6504879

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2 years ago

Describe how to prepare a 10.0% w/v solution of salt in water in a 100 mL volumetric flask

Sphinxa [80]

To prepare a 10.0% w/v solution of salt in water in a 100 mL volumetric flask, first you must weigh 10 g of salt because the 10 % 100 is 10 and the given should be 10 % w/v. place the 10 g salt to the volumetric flask then add water up until to mark of the volumetric flask then shake it.

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3 years ago

The distance from a crest to a trough is called the wave length

V125BC [204]

Answer:

Explanation:

The highest surface part of a wave is called the crest, and the lowest part is the trough. The vertical distance between the crest and the trough is the wave height. The horizontal distance between two adjacent crests or troughs is known as the wavelength.

I hope it's helpful!

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3 years ago