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Alenkinab [10]
3 years ago
9

Select all that apply.

Physics
1 answer:
bonufazy [111]3 years ago
4 0

Mechanical energy of the ball will remain conserved

so here we have

E = mgh + \frac{1}{2}mv^2

E = 0.200(9.8)(2) + 0

E = 3.92 J

so mechanical energy will remain same at all positions

Now when ball comes to position of 1 m height then potential energy is given as

U = mgh

U = (0.200kg)(9.8 m/s^2)(1 m)

U = 1.96 J

Now since total mechanical energy is conserved so we will say

KE + U = E

KE + 1.96 = 3.92

KE = 1.96 J

so we have

its mechanical energy = 3.92 J

its potential energy = 1.96 J

its kinetic energy = 1.96 J

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A spaceship travels toward the Earth at a speed of 0.97c. The occupants of the ship are standing with their torsos parallel to t
Ket [755]

Answer:

Explanation:

We shall apply length contraction einstein's relativistic formula to calculate the length observed by observer on the earth . For the observer , increased length will be observed for an observer on the earth

L=\frac{.5}{\sqrt{1-(\frac{.97c}{c})^2 } }

L=\frac{.5}{.24}

L= 2.05

The length will appear to be 2.05 m . and width will appear to be .5 m  to the observer on the spaceship. . It is so because it is length which is moving parallel to the direction of travel. Width will remain unchanged.  

3 0
4 years ago
An unknown amount of a radioactive isotope with a half-life of 2.0 h was observed for 6.0 h. if the amount of the isotope remain
Grace [21]

The original amount of the radioactive isotope will be 8 grams.

<h3 /><h3>What is the half-life of radioisotopes?</h3>

The amount of time required for half of a radioisotope's nuclide to decay, or change into a different species, is known as its half-life. The conversions release either beta or alpha particles, and the response can be monitored by counting the particles released.

Given that an unknown amount of a radioactive isotope with a half-life of 2.0 h was observed for 6.0 h. if the amount of the isotope remaining after 6.0 h was 24 g.

The original amount will be calculated as below:-

( 2 / 6 ) = ( Original amount / 24 )

Original amount = 4 x 2

Original amount = 8 grams

Therefore, the original amount of the radioactive isotope will be 8 grams.

To know more about the half-life of radioisotopes follow

brainly.com/question/1783783

#SPJ4

5 0
2 years ago
Determine the kinetic energy of a 1500 kg roller coaster that is moving with a
olga2289 [7]

Answer:

<h2>918,750 J</h2>

Explanation:

The kinetic energy of an object can be found by using the formula

k =  \frac{1}{2} m {v}^{2}  \\

m is the mass in kg

v is the velocity in m/s

From the question

m = 1500 kg

v = 35 m/s

We have

k =  \frac{1}{2}  \times 1500 \times  {35}^{2}  \\  = 750 \times 1225 \\  = 918750

We have the final answer as

<h3>918,750 J</h3>

Hope this helps you

3 0
3 years ago
How is heat transferred?
leonid [27]

Answer:

convection, conduction, and radiation

Explanation:

4 0
3 years ago
Read 2 more answers
A wave has a wavelength of 0.02m and period of 8.0*10^-2 seconds. calculate it's speed. (showing working)​
erik [133]

Answer:

v = 0.25m/s

Explanation:

Given

\lambda = 0.02m --- Wavelength

T = 8.0 * 10^{-2}s --- Period

Required

Determine the velocity of the wave

This is calculated using:

v = \frac{\lambda}{T}

v = \frac{0.02m}{8.0*10^{-2}s}

v = \frac{0.02m}{8.0*0.01s}

v = \frac{0.02m}{0.08s}

v = 0.25m/s

<em>Hence, the velocity is 0.25m/s</em>

4 0
3 years ago
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