A hockey puck has a mass of 210 g. If the hockey puck has 73 J of kinetic energy, what is its speed?
well, KE = 1/2 mv^2
now just plug and chug ... (watch the units!)
To find the speed of the hockey puck, we need to use the equation for kinetic energy.
The formula for kinetic energy is:
Kinetic Energy (KE) = (1/2) * mass * speed^2
First, let's convert the mass of the hockey puck from grams to kilograms:
Mass (m) = 210 g = 0.210 kg
Now, we can rearrange the equation for kinetic energy to solve for speed:
KE = (1/2) * m * speed^2
Rearranging the equation gives us:
speed^2 = (2 * KE) / m
Plugging in the values we know:
speed^2 = (2 * 73 J) / 0.210 kg
Simplifying gives us:
speed^2 = 694.4444 m^2/s^2
To find the speed, we take the square root of both sides:
speed = sqrt(694.4444 m^2/s^2)
Calculating the square root, we find that:
speed = 26.321 m/s
Therefore, the speed of the hockey puck is approximately 26.321 m/s.