Asatellite orbiting earth has a tangential velocity of 5000 m/s. earth’s mass is 6 × 1024 kg and its radius is 6.4 × 106 m. the distance of the satellite from earth, written in standard notation, is *blank* m.

Explanation:

we can solve the problem by equalizing the force of gravity that keeps the satellite in circular motion with the centripetal force:

where

is the gravitational constant

m is the satellite's mass

M is the Earth's mass

r is the distance of the satellite from Earth's center

v is the tangential velocity of the satellite

By re-arranging the formula and substituting the numbers, we find r:

However, this is the distance of the satellite from Earth's center. Since we want to know its distance from the Earth's surface, we must subtract the value of the Earth's radius:

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.

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.

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 . this process does not change the mass number.

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 -decay. in this the mass number remains same.

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