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a student wants to study the effect of adding thermal energy to a system. which of the following experiments should the student perform?

heat water and record its change in temperature with time.
freeze water and record its change in temperature with time.
close a circuit by adding a paperclip and record if the blub glows.
close a circuit by adding a wooden piece and record if the bulb glows.

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

Blank liquids and gases exert a buoyant force on objects placed in them

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?