Physics, 19.03.2020 21:32 rowellr3

A 0.14-kg baseball is moving at 41 m/s. A 0.058-kg tennis ball is moving at 67 m/s. Which of the two balls has higher kinetic energy?

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Answer from: oliviaprejean18

The kinetic energy of tennis ball is higher than that of baseball.

Explanation:

mass of baseball $m_{b}$ = 0.14 kg

velocity of baseball $v_{b}$ = 41 m/s

mass of tennis ball $m_{t}$ = 0.058 kg

velocity of tennis ball $v_{t}$ = 67 m/s

To find: the kinetic energy of baseball $KE_{b}$ and tennis ball $KE_{t}$

We know that the kinetic energy is given by the equation,

KE = $\frac{mv^{2}}{2}$

the kinetic energy of baseball $KE_{b}$ = $\frac{m_{b}v_{b} ^{2}}{2}$

= $\frac{0.14 * 41^{2}}{2}$

= 117.67 J

the kinetic energy of tennis ball $KE_{t}$ = $\frac{m_{t}v_{t} ^{2}}{2}$

= $\frac{0.058 * 67^{2}}{2}$

= 130.181 J

Hence $KE_{t}$ > $KE_{b}$ , the kinetic energy of tennis ball is higher than that of baseball

Answer from: Quest

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

$_a^z\textrm{x}\rightarrow _{a-2}^{z-4}+_2^4\alpha$

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

$_a^z\textrm{x}+_{-1}^0\textrm{e}\rightarrow _{z-1}^a\textrm{y}$

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases $\gamma -radiations$ . this process does not change the mass number.

$_a^z\textrm{x}^*\rightarrow _a^z\textrm{x}+_0^0\gamma$

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as $\beta ^+$ -decay. in this the mass number remains same.

$_a^z\textrm{x}\rightarrow _{z-1}^a\textrm{y}+_{+1}^0e$

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

Answer from: Quest

Hey hope you get the answer but i suck at math sorry : (

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A 0.14-kg baseball is moving at 41 m/s. A 0.058-kg tennis ball is moving at 67 m/s. Which of the two...