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stars begin as a giant cloud of gas which is also a protostar. gravity will pull the gas in on intelf which increases heat and pressure to such great quantities that nuclear fusion can begin. hydrogen is ...

Energy required calculated using the equation for specific heat capacity: mcdT = dE where m is mass, c is specific heat capacity and dT is the change in temperature.
Time taken is calculated...

Initial energy (Gravitational Potential): E = mgh = 0.5 x 9.81 x 2 = 9.81J Final energy (Kinetic): E = mv²/2 = (0.5 x 5²)/2 = 6.25J Energy lost = 9.81 - 6.25 = 3.56J

Work done = force x distance moved

Work done = 13 N x 110 m

Work done = 1430 J

Sometimes, but definitely not always! Note: it's all dependent on which direction has been assigned '+'. Acceleration is a vector quantity, (the rate of change of velocity), meaning it has both<...