All categories

2 years ago

How many significant figures does each value contain?

Physics

2 answers:

Daniel [21]2 years ago

6 0

Answer:

2,3,4,3,6

Explanation:

Sindrei [870]2 years ago

4 0

Answer:

81,000 has 5 significant figures

3.14 has 3 significant figures

5.670 has 3 significant figures

502 has 3 significant figures

207.300 has 4 significant figures

You might be interested in

An electromagnetic wave traveling in a

siniylev [52]

Answer would be c as shown in the photo

3 0

2 years ago

Ex 3) A tennis player lobs the tennis ball up in the air during a serve at a rate 3 m/s.

slega [8]

Explanation:

s=(v^2-u^2)/2g

=(0-3^2)/2*10

= 0.45m

3 0

2 years ago

Water is falling on a surface, wetting a circular area that is expanding at a rate of 4 mm2 /s. How fast is the radius of the we

STALIN [3.7K]

Answer:

The radius of the wetter area expands at a rate of $4.244\times 10^{-3}$ milimeters per second when radius is 150 milimeters.

Explanation:

From Geometry we remember that area of a circle is described by this expression:

$A =\pi\cdot r^{2}$ (Eq. 1)

Where:

$r$ - Radius of the circle, measured in milimeters.

$A$ - Area of the circle, measured in square milimeters.

Then, the rate of change of the area in time is derived by concept of rate of change, that is:

$\frac{dA}{dt} = 2\pi\cdot r\cdot \frac{dr}{dt}$ (Eq. 2)

Where:

$\frac{dr}{dt}$ - Rate of change of radius in time, measured in milimeters per second.

$\frac{dA}{dt}$ - Rate of change of area in time, measured in square milimeters per second.

Now the rate of change of radius in time is cleared within equation above:

$\frac{dr}{dt} = \left(\frac{1}{2\pi\cdot r}\right)\cdot \frac{dA}{dt}$

If we know that $r = 150\,mm$ and $\frac{dA}{dt} = 4\,\frac{mm^{2}}{s}$ , then the rate of change of radius in time is:

$\frac{dr}{dt} = \left[\frac{1}{2\pi\cdot (150\,m)} \right] \cdot \left(4\,\frac{mm^{2}}{s} \right)$

$\frac{dr}{dt}\approx 4.244\times 10^{-3}\,\frac{mm}{s}$

The radius of the wetter area expands at a rate of $4.244\times 10^{-3}$ milimeters per second when radius is 150 milimeters.

7 0

2 years ago

Water flows through a horizontal pipe. The diameter of the pipe at point Bis larger than the diameter of the pipe at point A. Wh

777dan777 [17]

B. It is point A , the proof is in this photo if it’s wrong please correct me

6 0

2 years ago

A 22 kg solid door is 220 cm tall, 91 cm wide. a) What is the door's moment of inertia for rotation about a vertical axis inside

iris [78.8K]

Answer

given,

mass of the solid door = 22 Kg

dimension of door = 220 cm x 91 cm

moment of inertia about the hinge

$I = \dfrac{1}{3}Mr^2$

r is the distance from the one edge which is equal to 91 cm or 0.91 m

$I = \dfrac{1}{3}\times 22 \times 0.91^2$

$I = 6.073\ kg m^2$

Moment of inertia about center for rectangular gate is equal to

$I_{CM} = \dfrac{1}{12}Mr^2$

moment of inertia for rotation about a vertical axis inside the door, 15 cm from one edge

$I = I_{CM} + MR^2$

$I = I_{CM} + M(\dfrac{91}{2}- 15)^2$

$I = \dfrac{1}{12}Mr^2+ M(0.0930)$

$I = \dfrac{1}{12}\times 22 \times 0.91^2+ 22 \times (0.093)$

$I = 3.56\ Kg m^2$

3 0

2 years ago