12-35 A cup is made of copper. The mass of the cup is 500 gm. Calculate
(a) the heat capacity of the cup, and
(b) the temperature to which the cup is
raised when 8.78 x 103 J of heat is
supplied to the cup. Specific heat of
copper is 390 J/kg. K and the cup is
initially at 20°C. [Answer = 195 J/K,
65°C]

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?

How are positive ions different from neutral atoms