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3 years ago

What is the difference between vector and scalar quantities.give an example of both.

Physics

2 answers:

inysia [295]3 years ago

8 0

Answer: The difference between vector and scalar quantity are:

<h3>Vector quality </h3>

i) Vectors have both magnitude and direction.

ii) The sum of vectors may be positive, zero or negative.

iii) Vectors are added by the rules of vector algebra.

iv) For example: velocity, acceleration,force , weight etc...

<h3>Scalar quantity </h3>

i) Scalars have only magnitude

ii) The sum of scalars is always positive.

iii) Scalars are added by the rules of simple algebra.

iv) For example: length,time ,volume ,area etc

Zigmanuir [339]3 years ago

5 0

Difference Between a Scalar & Vector Quantity:

A vector quantity has a direction and a magnitude, while a scalar quantity only has magnitude.

Examples:

Scalar quantity include things like speed, time, volume, mass and temperature, while Vector quantities include things like acceleration, velocity, force, momentum and the increase and decrease in temperature.

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A light ball is dropped straight down off a ledge and hits the ground. A heavy ball is thrown straight down from the ledge, rele

Anettt [7]

Answer:

(d) I and III

Explanation:

Motion of the 1st light ball

$s = gt_1^2/2$

$s = v_0t_2 + gt_2^2/2$

I. Since the heavier starts with an initial velocity v0, and both balls end up traveling the same distance s. From the 2 motion equation above we can conclude that their time must be different

II. Both balls are affected by the same gravitational acceleration g

III. Velocity before the impact of the light ball

$v_1^2 = 2gs$

And the heavy ball

$v_2^2 - v_0^2 = 2gs$

Since they have the same acceleration g and distance s. But the heavy ball has an initial push. It would end up with a larger speed.

7 0

3 years ago

Determine the amount of time for polonium-210 to decay to one fourth its original quantity. The half-life of polonium-210 is 138

ira [324]

Answer: 276 days

Explanation:

This problem can be solved using the Radioactive Half Life Formula:

$A=A_{o}.2^{\frac{-t}{h}}$ (1)

Where:

$A=\frac{1}{4}A_{o}$ is the final amount of the material

$A_{o}$ is the initial amount of the material

$t$ is the time elapsed

$h=138 days$ is the half life of polonium-210

Knowing this, let's substitute the values and find $t$ from (1):

$\frac{1}{4}A_{o}=A_{o}2^{\frac{-t}{138 days}}$ (2)

$\frac{A_{o}}{4A_{o}}=2^{\frac{-t}{138 days}}$ (3)

$\frac{1}{4}=2^{\frac{-t}{138 days}}$ (4)

Applying natural logarithm in both sides:

$ln(\frac{1}{4})=ln(2^{\frac{-t}{138 days}})$ (5)

$-1.386=-\frac{t}{138days}ln(2)$ (6)

Clearing $t$ :

$t=276days$ (7)

7 0

3 years ago

The objective lens of a certain refracting telescope has a diameter of 63.5 cm. The telescope is mounted in a satellite that orb

Ostrovityanka [42]

Answer:

0.255 m

Explanation:

We are given that

Diameter=d=63.5 cm= $63.5\times 10^{-2} m$

$1 cm=10^{-2} m$

L=265 km = $265\times 1000=265000 m$

Wavelength, $\lambda=500nm=500\times 10^{-9} m$

$1nm=10^{-9} m$

We have to find the minimum distance between two objects on the ground if their images are to be resolved by this lens.

$sin\theta=1.22\frac{\lambda}{d}$

$sin\theta=\frac{1.22\times 500\times 10^{-9}}{63.5\times 10^{-2}}$

$sin\theta=\approx \theta=9.606\times 10^{-7} rad$

$\frac{y}{L}=tan\theta\approx \theta$

$y=L\theta=265000\times 9.606\times 10^{-7}=0.255 m$

5 0

3 years ago

What would always be true of an object possessing a potential energy of 0 joules

Elenna [48]

<em>if the object has 0 potential energy it means it is on ground ..
<u>explanation :
</u>to measure potential energy we take ground as a reference point but when object is placed on reference point i.e ground then height is 0..
as potential energy = mgh .. here h becomes 0 so potential energy is 0 joules..</em>

6 0

3 years ago

A laser on the South American plate takes a certain amount of time to reach a satellite and bounce back to Earth. Five years lat

tigry1 [53]

I think the answer is B but the problem in this part is that the South American plate has moved over time. You see the difference?

3 0

4 years ago

Read 2 more answers

What is the difference between vector and scalar quantities.give an example of both.​

What is the difference between vector and scalar quantities.give an example of both.