Ask question

Ask question

All categories

4 years ago

12

How many stars are on the us flag?

2 answers:

solniwko [45]4 years ago

7 0

They are 50 stars in the U.S flag.

zhannawk [14.2K]4 years ago

5 0

50 stars representing the 50 states

You might be interested in

Lymph contains hemocytes, a type of white blood cell.<br> true or false

larisa86 [58]

The above statement is true; This is because Lymph contains white blood cells. It has a composition that is comparable to that of blood plasma, however, they slightly differ. Hemocytes are types of cell that are found within the hemolymph and play a role in the immune system of organisms mostly the invertebrates, they are phagoctytes of the invertebrates,

5 0

3 years ago

A horizontal spring-mass system has low friction, spring stiffness 205 N/m, and mass 0.6 kg. The system is released with an init

Andreyy89

Answer:

(a). The maximum stretch during the motion is 20.7 cm

(b). The maximum speed during the motion is 3.84 m/s.

(c). The energy is 0.060 Watt.

Explanation:

Given that,

Spring stiffness = 205 N/m

Mass = 0.6 kg

Compression of spring = 13 cm

Initial speed = 3 m/s

(a). We need to calculate the maximum stretch during the motion

Using conservation of energy

$E_{initial}=E_{final}$

$\dfrac{1}{2}kx_{c}^2+\dfrac{1}{2}mv^2=\dfrac{1}{2}kx_{m}^2$

Put the value into the formula

$\dfrac{1}{2}\times205\times(13\times10^{-2})^2+\dfrac{1}{2}\times0.6\times3^2=\dfrac{1}{2}\times205\times x_{m}^2$

$x_{m}=\sqrt{\dfrac{4.43\times2}{205}}$

$x_{m}=20.7\ cm$

(b). Maximum speed comes when stretch is zero.

We need to calculate the maximum speed during the motion

Using conservation of energy

$E_{initial}=E_{final}$

$\dfrac{1}{2}kx_{c}^2+\dfrac{1}{2}mv^2=\dfrac{1}{2}mv'^2$

Put the value into the formula

$\dfrac{1}{2}\times205\times(13\times10^{-2})^2+\dfrac{1}{2}\times0.6\times3^2=\dfrac{1}{2}\times0.6\times v'^2$

$v'=\sqrt{\dfrac{4.43\times2}{0.6}}$

$v'=3.84\ m/s$

(c). Now suppose that there is energy dissipation of 0.02 J per cycle of the spring-mass system

We need to calculate the time period

Using formula of time period

$T=2\pi\sqrt{\dfrac{m}{k}}$

Put the value into the formula

$T=2\pi\sqrt{\dfrac{0.6}{205}}$

$T=0.33\ sec$

We need to calculate the energy

Using formula of energy

$E=\dfrac{P}{t}$

Put the value into the formula

$E=\dfrac{0.02}{0.33}$

$E=0.060\ Watt$

Hence, (a). The maximum stretch during the motion is 20.7 cm

(b). The maximum speed during the motion is 3.84 m/s.

(c). The energy is 0.060 Watt.

5 0

3 years ago

A bar of soap has a mass of 53.65 grams and its dimensions are 4.6cm by

steposvetlana [31]

Answer:

don't know

Explanation:

4 0

3 years ago

when we touch a steel rod and a paper simultaneously we feel that the rod is comparatively colder .why?

Snezhnost [94]

It is so because the steel is more colder than our body.

4 0

3 years ago

Speed versus Time

Otrada [13]

A since it’s the only one that makes sense! So A is correct.

8 0

3 years ago