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3 years ago

The difference between a Scalar quantity and a Vector quantity?

Physics

1 answer:

andrew-mc [135]3 years ago

3 0

Answer:

A quantity that has magnitude but no particular direction is described as scalar. A quantity that has magnitude and acts in a particular direction is described as vector.

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Jane described two substances which participate in photosynthesis. Substance A: Combines with water Substance B: Gaseous product

saul85 [17]

I am pretty sure the correct answer is C.
It makes the most sense.
Please correct me if I'm wrong.

5 0

3 years ago

Read 2 more answers

Help and explain please

babunello [35]

Answer: a) Moment = 200N.m

b) F = 500N

Explanation: Moment or Torque is the tendency of a body to rotate because of an aplplied force. It can be calculated as

$\tau = F.r.sin\theta$

F is force applied

r is distance from the force to the point of rotation

θ is the angle formed between force and distance

a) Since F and r are perpendicular, θ=90°, sin90° = 1, so

$\tau=F.r$

$\tau=100(2)$

$\tau=$ 200

Torque caused by weight of the barrier at the pivot is 200N.m

b) Counterweight has the same torque as pivot: $\tau=$ 200

So, to find Force necessary to balance the weight:

$\tau=F.r$

$F=\frac{\tau}{r}$

$F=\frac{200}{0.4}$

F = 500

It is necessary a force of 500N from the counterweight to balance the weight.

4 0

3 years ago

A coil consisting of 50 turns of wire is powered by a 9V battery. If the coil draws 1.5 A from the battery, what is the MMF, in

aivan3 [116]

A. 75 ampere-turns

Explanation:

Given:

Number of turns, n = 50

Voltage, V = 9V

Current, I = 1.5A

MMF= ?

MMF is magnetomotive force.

MMF is independent on voltage and dependent on the number of turns and current in the wire.

Thus, MMF can be written as:

$MMF = nI$

On substituting the value we get:

MMF = 50 X 1.5

MMF = 75 ampere-turns

7 0

3 years ago

A two-liter bottle is one-fourth full of water and three-quarters full of air. The air in the bottle has a gage pressure of 340

Fantom [35]

Answer:

The value is $P_G = 2.925 *10^{5} \ Pa$

Explanation:

From the question we are told that

The volume of the bottle is $v = 2 \ L = 2 * 10^{-3} \ m^3$

The gauge pressure of the air is $P_g = 340 \ kPa = 340 *10 ^{3} \ Pa$

Generally the volume of air before the bottle is turned upside down is

$V_a = \frac{3}{4} * V$

$V_a = \frac{3}{4} * 2 *10^{-3}$

$V_a = 0.0015 \ m^3 }$

Generally the volume air when the bottle is turned upside-down is

$V_u = \frac{5}{6} * 2 *10^{-3}$

$V_u = 0.00167 \ m^3$

From the the mathematical relation of adiabatic process we have that

$P_g * V_a^r = P_G * V_u^r$

Here r is a constant with a value r = 1.4

$340 *10 ^{3} * 0.0015^{1.4} = P_G * 0.00167^{1.4}$

$P_G = 2.925 *10^{5} \ Pa$

3 0

3 years ago

The human ear canal is about 2.9 cm long and can be regarded as a tube open at one end and closed at the eardrum. What is the fu

solniwko [45]

The frequency of the human ear canal is 2.92 kHz.

Explanation:

As the ear canal is like a tube with open at one end, the wavelength of sound passing through this tube will propagate 4 times its length of the tube. So wavelength of the sound wave will be equal to four times the length of the tube. Then the frequency can be easily determined by finding the ratio of velocity of sound to wavelength. As the velocity of sound is given as 339 m/s, then the wavelength of the sound wave propagating through the ear canal is

Wavelength=4*Length of the ear canal

As length of the ear canal is given as 2.9 cm, it should be converted into meter as follows:

$wavelength = 4*2.9*10^{-2} =0.116$

Then the frequency is determined as

f=c/λ=339/0.116=2922 Hz=2.92 kHz.

So, the frequency of the human ear canal is 2.92 kHz.

4 0

3 years ago