2 Fig. 2.1 shows a skier of mass 85 kg skiing down a very steep slope.
skier
33
BI
Fig. 2.1 (not to scale)
The skier starts from rest at the top T of the slope. The force of gravity accelerates him down the
slope.
When he reaches the bottom B of the slope, his kinetic energy is 5.5 x 104J.
(a) The gravitational field strength is 10 N/kg. Calculate
(i) the weight of the skler,
XION​

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

What are the north and south poles of a solenoid change with?