An elevator filled with passengers has a mass of 1683 kg. (a) The elevator accelerates upward from rest at a rate of 1.20 m/s2 for 2.75 s. Calculate the tension in the cable (in N) supporting the elevator. g

T = 18.529 KN

Explanation:

We are given that;

Mass; m = 1683 kg

Upwards, acceleration; a = 1.2 m/s²

Downwards, acceleration due to gravity; g = 9.81 m/s²

Time; t = 2.75s

Now, The tension in the cable exerts a force up while gravity exerts a force down. The mass has an upward acceleration and thus, there are no horizontal forces.

We will take up as positive.

Thus,

Fnet is given as; F = T - W

W = mg while F = ma. and so,

ma = T - mg

Where t is Tension in cable.

Thus,

T = ma + mg

T = m(a + g)

T = 1683(1.2 + 9.81)

T = 1683(11.01) = 18529N = 18.529 KN

answer: he got 23

explanation:

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.