The equation Bold r (t )r(t)equals=(6 Bold sin t )Bold i plus (6 Bold cos t )Bold j plus (3 t )Bold k(6 sin t) i+(6 cos t) j+(3t) k is the position of a particle in space at time t. Find the particle's velocity and acceleration vectors. Then write the particle's velocity at t equals StartFraction 3 pi Over 2 EndFractiont= 3π 2 as a product of its speed and direction

d is the correct answer

d. platinum would have the greatest temperature increase because it has the lowest specific heat.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.