Please help me 100 points for correct answers, answers without context will be reported 1. In the situation below, a tractor pulls the 850-kg sled along a ramp of height ℎ = 1 m and slope of θ = 30 °. If the tractor applies constant force on the sled T = 6750 N at an angle φ = 36.9 °, determine the total work done by all forces on the sled to move it along the ramp. The coefficient of kinetic friction between the sled and the plane is u = 0.3. Hint: For the calculation, remember that only the components of the forces parallel to the direction of travel contribute to the work. Disregard the dimensions of the sled.

2) When firing a 2 projectile at a 1.4 block, initially at rest, it is observed that the projectile wedges into the block and the system moves together for a distance = 0.1 before stopping. If the coefficient of kinetic friction between the block and the surface is = 0.25, determine what the velocity of the projectile was at the instant before impact. Hint: here you should use the conservation of linear momentum and also of energy, considering the work done by the frictional force.

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/4zZs6GM

you cant move and you feel like someones pushing you down onto your bed it can feel like you want to get up but you just can't it can be extremely scary

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.