Final answer:
The magnitude of the centripetal acceleration of the car is 196 km/hr^2.
Step-by-step explanation:
The magnitude of the centripetal acceleration of a race car moving on a circular track can be calculated using the following formula:
Centripetal Acceleration (a) = (v^2) / r
Where v is the speed of the car and r is the radius of the track.
Using the given values, the centripetal acceleration of the race car is:
a = (70 km/hr)^2 / 50 km
Simplifying the equation, we get:
a = 9800 km^2/hr^2 / 50 km
Finally, simplifying the units, the centripetal acceleration is:
a = 196 km/hr^2