The diameter of our disk-shaped galaxy, the milky way, is about 1.0 x 10^5 light-years (ly). the distance to the andromeda galaxy, which is the spiral galaxy nearest to the milky way, is about 2.0 million ly. if a scale model represents the milky way and andromeda galaxies as dinner plates 25 cm in diameter, determine the distance between the centers of the two plates.

500 cm

Explanation:

Diameter of Milky Way =

Here, this distance is equal = 25 cm

Distance between the Andromeda galaxy and Milky Way is 2 million ly

Hence, the plates would be 500 cm apart

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.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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