A ball with a mass of 2 kg is swinging in a horizontal circle of radius 20 cm. If thestring can sustain a maximum tension (T) of 500 N, what is the maximum speed theball can reach before the string breaks

7.07 m/s

Explanation:

We are given that

Mass of ball,m=2 kg

Radius of circle,r=20 cm=

1 m=100 cm

Maximum tension,T=500 N

We have to find the maximum speed of the ball can reach before the string breaks.

Tension,T=

Using the formula

v=ir = 3x15 =45 v

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.