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3 years ago

Which quantity is a scalar quantity

2 answers:

8 0

Length, or option C is the correct answer, since it does not have direction, just magnitude, hence forth a scalar quantity.

Naya [18.7K]3 years ago

3 0

Vectors have magnitude and direction, scalars<span> only have magnitude.</span>

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What is the following atmospheric property associated with?

Nadya [2.5K]

Answer:

Your answer should be Cooled Air

Explanation:

6 0

3 years ago

Which statements best describe half-lives of radioactive isotopes? Check all that apply.

victus00 [196]

Answer:

Explanation:

half life is the time taken for a radioactive isotopes to dissociate

7 0

2 years ago

Will mark as brainliest if correct!!!!!!!!!!!

Aneli [31]

Answer:

The answer is A.

Explanation:

The diagram shows the light ray bending away from the normal. Light rays bend away from the normal when their speed increases. This means that in the diagram, the light ray moves from a medium in which light has a lower speed to a medium in light has a higher speed. The only choice where the speed of light increases from A to B is answer A. So that has to be the answer.

7 0

3 years ago

Frim the castle wall 20 m high shot an arrow. The initial speed of the bow is 45 m/s directed 40 degrees above horizontal. Find

True [87]

Answer:

Range of arrow = 225.09 meter

Final horizontal velocity = 34.47 m/s

Explanation:

We have equation of motion $s=ut+\frac{1}{2} at^2$ , where u is the initial velocity, t is the time taken, a is the acceleration and s is the displacement.

Considering the vertical motion of arrow ( up direction as positive)

We have u = 45 sin40 = 28.93 m/s, s = -20 m, a = acceleration due to gravity = $-9.8m/s^2$ .

$-20=28.93*t-\frac{1}{2} *9.8*t^2\\ \\ 4.9t^2-28.93t-20=0$

t = 6.53 seconds or t = -0.63 seconds

So time = 6.53 seconds.

Considering the horizontal motion of arrow

u = 45 cos 40 = 34.47 m/s, t = 6.53 s, a = $0m/s^2$

$s=34.47*6.53+\frac{1}{2} *0*6.53^2\\ \\ s=225.09m$

So range of arrow = 225.09 meter

Horizontal velocity will not change , final horizontal velocity = 34.47 m/s.

7 0

3 years ago

You suspect that an uninterruptible power supply (UPS) is malfunctioning. You need to test the output from the UPS using a multi

zmey [24]

Answer:

Option A

Explanation:

An Uninterruptible Power Supply abbreviated as UPS is used in case of the failure of the power mains or the input power in order to ensure uninterrupted power supply.

The Ac voltage is first converted to DC and then again inverted to the AC and is fed to the system.

Thus if the UPS malfunctions then in order to check the output using multimeter we use AC voltage setting because the UPS purely supplies AC power, even if the power is supplied from its internal battery then also it inverts the DC into AC and then supply.

7 0

3 years ago