1. Sofia and Priya investigate friction. Here is the equipment they use.
masses
forcemeter
wooden block
pull
table
material
They put the wooden block with a force meter.
They repeat the investigation using different materials
What two measurements should they make?
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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.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

small = small current large mag large current

i think the answer is tomato juice? not entirely sure though