Aspaceship t travels through empty space. there are no gravitating bodies captain wants to change course a. it's possible only using the rocket effect. b. it's only necessary to rotate external propellers until it enters a gravitational force the captain is out of luck. the ship will coast field, or at least until it is surrounded by some gas

A) It is possible using the rockets

Explanation:

Spaceships don't have propellers, those require a fluid medium to work, and there is none in the vacuum of space.

Rocket thrusters do not require any fluid medium or being surrounded by any gas to work. Rockets work by the principle of conservation of momentum, they expell some propellant mass backwards at a high speed. In order to conserve momentum in the rocket-propellant system, the rocket increses it's speed forwars.

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.

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.