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Physics problems: kinematics

Part 6

 

Problem 51.

(Inquiry into Physics-5th ed.,Ostdiek,Bord) On a day the wind is blowing toward the south at 3m/s, a runner jogs west at 4m/s. What is the velocity of the air relative to the runner?

Solution

 

Problem 52.

(Inquiry into Physics-5th ed.,Ostdiek,Bord) A runner has an average speed of 4 m/s during a race. How far does the runner travel in 20 minutes?

Solution

 

Problem 53.

A car starts from the rest and accelerates uniformly for t=5 seconds over a distance of 100m. Find the acceleration of the car.

Solution

 

Problem 54.

On the moon, an object is dropped from a height of 2 m. The acceleration of gravity on the moon is . Determine the time it takes for the object to fall to the surface of the moon.

Solution

 

Problem 55.

A coin is dropped from a 400 m high tower. What is the coin's velocity when it hits the ground? How long does it take to get there?

Solution

 

 

 

Problem 56.

Does the odometer of a car measure a scalar or a vector quantity?

Solution

 

Problem 57.

The speed of light is about . Convert it into miles per hour (mph).

Solution

 

Problem 58.

You are driving towards a traffic signal when it turns yellow. Your speed is 55 km/h, and your best deceleration has the magnitude of . Your best reaction time before breaking is . To avoid having the front of your car enter the intersection after the light turns red, should you break to a stop or continue to move at 55 km/h if the distance to the intersection and the duration of the yellow light are

(a) 40m and 2.8s, and

(b) 32m and 1.8s?

Solution

 

Problem 59.

The tips of the blades in a food blender are moving with a speed of 20 m/s in a circle that has a radius of 0.06 m. How much time does it take for the blades to make one revolution?

Solution

 

Problem 60.

While you are traveling in a car on a straight road at 90 km/hr, another car passes you in the same direction; its speedometer reads 120km/hr. What is your velocity relative to the other driver? What is the other car's velocity relative to you?

Solution

 

 

 

 

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