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Naya [18.7K]
4 years ago
11

PLEASE HELP PHYSICS!!!!! WILL MARK BRAINLIEST IF CORRECT!!!!

Physics
2 answers:
denis-greek [22]4 years ago
8 0

Elapsed Time=Time(final)-Time(initial)

The elapsed time for Trial B is 3 seconds.


Average speed=distance traveled/elapsed time

The average speed for Trial B is 1.3 m/s.

hope i helped

zaharov [31]4 years ago
6 0

a) Elapsed time for trial B: 3.0 s

Explanation:

The elapsed time is defined as the difference between the final time and the initial time:

t_{elapsed} = t_{final}-t_{initial}

For trial B, the final time is 4.5 s, while the initial time is 1.5 s, therefore the elapsed time is

t_{elapsed} = 4.5 s-1.5 s=3.0 s


b) Average speed for trial B: 1.3 m/s

Explanation:

The average speed is given by the distance traveled divided by the elapsed time:

v=\frac{d}{t_{elapsed}}

For trial B, the distance traveled is d=4.0 m, while the elapsed time is t=3.0s, therefore the average speed is

v=\frac{4.0 m}{3.0 s}=1.3 m/s

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Cesium-137 undergoes beta decay and has a half-life of 30.0 years. How many beta particles are emitted by a 14.0-g sample of ces
Mandarinka [93]

Answer: 0.81\times 10^{16} beta particles

Explanation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass = 14.0 g

Molar mass = 137 g/mol

\text{Number of moles of cesium}=\frac{14.0g}{137g/mol}=0.102moles

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

1 mole of cesium contains atoms =  6.023\times 10^{23}

0.102 moles of cesium contains atoms =  \frac{6.023\times 10^{23}}{1}\times 0.102=0.614\times 10^{23}

The relation of atoms with time for radioactivbe decay is:

N_t=N_0\times \frac{1}{2}^{\frac{t}{t_{\frac{1}{2}}}}

Where N_t =atoms left undecayed

N_0 = initial atoms

t = time taken for decay = 3 minutes

{t_{\frac{1}{2}}} = half life = 30.0 years = 1.577\times 10^7 minutes

The fraction that decays  :  1-(\frac{1}{2})^{\frac{3}{1.577\times 10^7}}=1.32\times 10^{-7}

Amount of particles that decay is  = 0.614\times 10^{23}\times 1.32\times 10^{-7}=0.81\times 10^{16}

Thus 0.81\times 10^{16} beta particles are emitted by a 14.0-g sample of cesium-137 in three minutes.

7 0
3 years ago
Isla’s change in velocity is 30 m/s, and Hazel has the same change in velocity. Which best explains why they would have differen
Mashcka [7]

Answer:

The answer is B) Isla had a different time than hazel

Explanation:

5 0
3 years ago
Normal body temperature. the average normal body temperature measured in the mouth is 310 k . what would celsius and fahrenheit
faltersainse [42]
The question is simply asking us to convert one unit, in this case temperature, to another unit. To do this, we need conversion factors to multiply, divide or relate to the original measurement. We do as follows:

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Fahrenheit = <span> (°</span>C<span> × </span>9<span>/5) + 32
</span> (36.85<span> × </span>9<span>/5) + 32 = 98.33 degrees fahrenheit
</span>
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7 0
3 years ago
) what is kinetic energy, and how does it differ from potential energy?
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3 years ago
Sylvia and Jadon now want to work a problem. Imagine a puck of mass 0.5 kg moving in a circular simulation. Suppose that the ten
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Answer:

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Explanation:

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The tangential speed of the puck.

Solution,

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v = 2.64 m/s

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3 0
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