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2 years ago

6

physics a flower pot falls from a windowsill 25.0m above the sidewalk. how fast is the flowerpot moving when it strikes the grou

nd?

1 answer:

Angelina_Jolie [31]2 years ago

5 0

Use the formula
$v_f^2 = v_0^2+2ad$

You might be interested in

Potassium is a crucial element for the healthy operation of the human

Degger [83]

Answer:

1

The mass of the Potassium-40 is $m_{40}} = 2.88*10^{-6} kg$

2

The Dose per year in Sieverts is $Dose_s = 26.4 *10^{-10}$

Explanation:

From the question we are told that

The isotopes of potassium in the body are Potassium-39, Potassium-40, and Potassium- 41

Their abundance is 93.26%, 0.012% and 6.728%

The mass of potassium contained in human body is $m = 3.0 g = \frac{3}{1000} = 0.0003 \ kg$ per kg of the body

The mass of the first body is $m_1 = 80 \ kg$

Now the mass of potassium in this body is mathematically evaluated as

$m_p = m * m_1$

substituting value

$m_p = 80 * 0.0003$

$m_p =0.024 kg$

The amount of Potassium-40 present is mathematically evaluated as

$m_{40}} =$ 0.012% * 0.024

$m_{40}} = \frac{0.012}{100} * 0.024$

$m_{40}} = 2.88*10^{-6} kg$

The dose of energy absorbed per year is mathematically represented as

$Dose = \frac{E}{m_1}$

Where E is the energy absorbed which is given as $E = 1.10 MeV = 1.10 * 10^6 * 1.602*10^{-19}$

Substituting value

$Dose = \frac{ 1.10 * 10^6 * 1.602*10^{-19}}{80}$

$Dose = 22*10^{-10} J/kg$

The Dose in Sieverts is evaluated as

$Dose_s = REB * Dose$

$Dose_s = 1.2 * 22*10^{-10}$

$Dose_s = 26.4 *10^{-10}$

3 0

2 years ago

Where does body heat come from?

ruslelena [56]

Friction produces heat

8 0

2 years ago

Read 2 more answers

A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is 36 m/s when i

Ganezh [65]

Answer:

its speed when its height was half that of its starting point is 25.46 m/s

Explanation:

Given;

final speed of the roller coaster, v = 36 m/s

Applying general equation of motion;

V² = U² + 2gh

where;

V is the final speed of the roller coaster

U is the initial speed of the roller coaster = 0

h is the height attained at a given velocity

36² = 0 + (2 x 9.8)h

1296 = 19.6 h

h = 1296/19.6

h = 66.1224 m

when its height was half that of its starting point, h₂ = ¹/₂ h

h₂ = ¹/₂(66.1224 m) = 33.061 m

At h = 33.061 m, V = ?

V² = U² + 2gh

V² = 0 + 2 x 9.8 x 33.061

V² = 648

V = √648

V = 25.46 m/s

Therefore, its speed when its height was half that of its starting point is 25.46 m/s

8 0

2 years ago

if a sports car can go from 0 to 60 mph in 3.8 seconds, what would be it's final speed after 6 seconds if it's starting speed wa

erma4kov [3.2K]

Verrrrrry interesting !

Acceleration = (change in speed) / (time for the change)

The car's acceleration is (60 mph) / (3.8 sec) = (60/3.8) mile/hr-sec .

Final speed = (original speed) + (acceleration · time)

   = (30 mi/hr) + (60/3.8 mi/hr-sec)·(6 sec)

   = (30)mi/hr + (360 / 3.8)mi/hr

   = 124.7 mph .

4 0

2 years ago

a 0.13 kg stopper is attched to a 0.93 m length of string. the stopper is swung in.a horizontal circle making one revolution in

Crazy boy [7]

The speed of the stopper is 4.95 m/s, while the centripetal force on the stopper and the tension in the string is 3.42N each.

The mass of the stopper is 0.13 Kg, the length of the string to which it is attached is 0.93 m. The stopper swung and made one revolution in 1.18 seconds, so the time period of revolution of the stopper is 1.18 seconds.

The relation between the time period and the angular speed is,

T = 2π/W

W is angular speed and T is the time period of revolution.

Putting values,

1.18 = 2π/W

W = 5.32 rad/s.

The speed of the stopper can be found as,

v = rW

r is the length of the string,

V = 4.95 m/s.

The centripetal force on the stopper is given by,

F = MV²/r

Putting values,

F = 0.13 x 4.95 x 4.95/0.93

F = 3.42 N.

The tension in the string will be equal to the centripetal force on the stopper, so, the tension is 3.

42 N.

To know more about centripetal force, visit,

brainly.com/question/20905151

#SPJ4

8 0

11 months ago