Physics problems: kinematics

Part 8


Problem 71.

A stone falls freely from rest for 10 s. What is the stones displacement during this time.



Problem 72.

A typical atom has a diameter of . What is this in inches?



Problem 73.

A rock is shot up vertically upward from the edge of the top of the building. The rock reaches its maximum height 2 s after being shot. Them, after barely missing the edge of the building as it falls downward, the rock strikes the ground 8 s after it was launched. Find

(a) upward velocity the rock was shot at;

(b) the maximum height above the building the rock reaches; and

(c) how tall is the building?

Disregard air resistance.



Problem 74.

A car going at 10 m/s undergoes an acceleration of for 6 seconds.  How far did it go when it was accelerating?



Problem 75.

What is the displacement of a car accelerating from 5 m/s (right) to 10 m/s (right) in 2.0s?





Problem 76.

A plane flies 50 degrees east of south for 100 km then 400 km north and then 20 degrees north of west for 250 km. What is the magnitude of the net displacement?



Problem 77.

Calculate the hang time of an athlete who jumps a vertical distance of .9 meters considering the acceleration of gravity is



Problem 78.

A man is driving at the speed 40 mph when he see an obstacle at distance 300 ft ahead of his position. The driver applies the brakes and decelerates at How long does it take him to stop the vehicle? How far from the obstacle will the driver be when he finally stops?



Problem 79.

The highest barrier that a projectile can clear is 20 m, when the projectile is launched at an angle of 40.0 degrees above the horizontal. What is the projectile's launch speed?



Problem 80.

You travel on the highway at a rate of 60 mph for 1 hour and at 50 mph for 2 hours and 40 mph for 3 hours. What is the total distance you have traveled? What is your average speed during the trip?





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