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4 years ago

What do you mean by physical quantity

2 answers:

7 0

A physical quantity is something which can be measured and whose measurement is necessary because all the laws of physics are given in terms of these physical quantities. The examples of physical quantity are mass, length, time, temperature, electric current, velocity , acceleration, force, work, weight,power, energy etc.

There are some quantities which cannot be measured and hence are not classified as physical quantities , for example, love, honesty, hatred etc

Thus a physical quantity is a quantity which can be measured.

Zinaida [17]4 years ago

6 0

Is mean something the you can measure with lenght weight time of fall

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As a train accelerates away from a station, it reaches a speed of 4.6 m/s in 5.2 s. If the train's acceleration remains constant

Svet_ta [14]

Answer:

Vf = 10.76 m/s

Explanation:

Train kinematics

The train moves with uniformly accelerated movement

$V_f = V_o + a*t$ Formula (1)

Vf: Final speed (m/s)

V₀: Inital speed (m/s)

t: time in seconds (s)

a: acceleration (m/s²)

Movement from t = 0 to t = 5.2s

We replace in formula (1)

4.6 = 0 + a*5.2

a = 4.6/5.2 = 0.88 m/s²

Movement from t = 5.2s to t = 5.2s + 7s = 12.2s

We replace in formula (1)

$V_f = 4.6 + 0.88*7$

Vf = 10.76 m/s

3 0

3 years ago

The foot pedal on hydraulic brake system exerts a force of 45 lb on a piston with a diameter of 1.00 cm. The brake fluid in the

ElenaW [278]

Answer:

the correct answer is C, 281 lb

Explanation:

This is an exercise in fluid mechanics specifically on Pascal's principle, which states that the pressure in a fluid is equal to all points that are at the same depth

P = $\frac{F_{1} }{A_{1} }$ = $\frac{F_{2} }{A_{2} }$

If we use the subscript 1 for the piston diameter mentor (d = 1.00vm) which is r = 0.05 cm, the force is F1 = 45 lb

F₂ = \frac{F_{1} }{A_{1} } F₁

in area of a circules

A = π r²

we substitute

F₂ = $\frac{r_{2}^2 }{r_{1}^2} F_{1}$

let's calculate

F2 = 2.50² / 1.00² 45

F2 =281 lb

therefore the correct answer is C

3 0

3 years ago

Help please ! Ill give brainliest !! ☁️✨

KATRIN_1 [288]

Answer:
Force Meter > used to measure force
Milli > Prefix that means 1/1,000
Centi > Prefix that means 1/100
Kilo > Prefixes that means 1,000
Thermometer > used to measure Temperature

Explanation: uh just trust

3 0

3 years ago

An object with an initial speed of 4.0 meters per second accelerates uniformly at 2.0 meters per second squared in the direction

leva [86]

Answer:

6 m/s.

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 4 m/s

Acceleration (a) = 2 m/s²

Distance (s) = 5 m

Final velocity (v) =?

The final velocity of the object can obtained as shown below:

v² = u² + 2as

v² = 4² + (2 × 2 × 5)

v² = 16 + 20

v² = 36

Take the square root of both side.

v = √36

v = 6 m/s

Therefore, the final speed of the object is 6 m/s.

8 0

3 years ago

I’m gym class you run 22m horizontal then climb a rope vertically for 4.8m. What is the direction angle of your total displaceme

Sliva [168]

The answer is: 12.30 degrees.

To solve this problem you must apply the proccedure shown below:

1. You run 22 meters horizontally and then you climb a rope vertically for 4.8 meters.

2. So. let's call the angle $\alpha$ , therefore, you must find it using $tan^{-1}$ , as following:

$tan^{-1}(\alpha)=\frac{opposite}{adjacent} \\opposite=4.8\\adjacent=22$

3. Substitute values and solve for the angle:

$tan^{-1}(\alpha)=\frac{4.8}{22}\\\alpha=12.30degrees$

5 0

3 years ago