1. According to its computer, a rocket launched traveled 1200 m, had an average speed of 100.0
m/s. How-long did the trip take?

I think it's = 12 seconds

Explanation:

the formula for speed is:

speed= SO, time is equal to:

time=

(sub the numbers in the formula)

distance=1200m, speed=100m/s

time=

=12 seconds

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.

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.