Physics, 21.11.2019 08:31 AdoNice

Which object has the least amount of kinetic energy? a car driving down a road a soccer ball rolling down a hill a bicycle locked to a bike rack a satellite orbiting earth

Answers: 2

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Answers

Answer from: hana560

a bicycle locked to a bike rack im pretty sure

Answer from: jadajordan1010

A bicycle locked to a bike

Explanation:

The kinetic energy of an object when an object is moving. The mathematical expression for the kinetic energy of an object is given by :

$KE=\dfrac{1}{2}mv^2$

Where

m is the mass of an object

v is the velocity of an object

First option : A car driving down a road, the car is moving i.e. it will possess kinetic energy.

Second option : A soccer ball rolling down a hill, the ball is moving i.e. it will possess kinetic energy

Third option : A bicycle locked to a bike, neither bicycle nor bike is moving i.e. it will not possess kinetic energy.

Fourth option : A satellite orbiting Earth, the satellite is moving i.e. it will possess kinetic energy.

Hence, "a bicycle locked to a bike " has least amount of kinetic energy.

Answer from: Quest

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

50 points to answer this question drag each tile to the correct location. classify the hypotheses ab

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.

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