A mechanic uses the spanner shown in the figure below to turn a bolt B into a threaded nut. The force Fused to do this is applied in a horizontal plane at right angles to the spanner. 15.0 cm threads a) Sketch a simple, labelled diagram showing the forces acting in the horizontal plane on the spanner as it begins to turn the bolt. b) If the effort, F, is 80.0 N and is applied 15.0 cm from the axis of the bolt, calculate the moment of the forces opposing F as the spanner just begins to turn. c) Name the principle used in obtaining your result in b) above. d) Explain why, if the mechanic uses a longer spanner, the effort needed will be smaller.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

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.