The largest tendon in the body, the achilles tendon, connects the calf muscle to the heel bone of the foot. this tendon is typically 15.0 cm long, 6.00 mm in diameter, and has a young's modulus of 1.50×109 pa . if an athlete has stretched the tendon to a length of 16.1 cm , what is the tension t , in newtons, in the tendon?

The tension in the tendon is 2.9kN

Explanation:

To solve the problem it is necessary to apply the concepts related to stress from the elongation of bodies by means of Young's Module.

The definition of Tension is given by

Where,

A =Area

Y = Young's modulus

Change in lenght

Initial Lenght

The change in Length for this case is given by

= 16.1-15 = 1.1cm

The area can be calculated as,

Therefore replacing the tension would be,

Therefore the tension in the tendon is 2.9kN

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.

i think the answer would be b