Classical Mechanics Answers

Represent graphic the force of Weight of a man. Is the Weight force of a man on Earth the same if the man is sitting vertical or horrizontal?

An ice glider, that has a mass of 1640 kg, is initially moving at 20 m/s NW. A wind accelerates the glider at 2.5 m/s? 20° E of N for eight second. Then the wind shifts to 48°E of N accelerating the glider at 1.8 m/s for 11 seconds. 1) What is the glider's initial kinetic energy? 2) What is the glider's velocity at t= 8 s? 3) How much energy did the wind transfer to the glider during the 8 s? 4) What was the glider's velocity after the 11s the second wind gust was active? 5) How much energy did the wind transfer to the glider during the 19s? 6) What was the glider's average speed from t = 0 s to t = 19 s? 7) What was the glider's displacement from t = 0 s to t = 19 s? 8) What was the glider's average velocity from t = 8stot=198? 9) What was the glider's final kinetic energy? 10) A student contends that the glider will have the largest force at t = 19 s since it has the most kinetic energy at that time. Is this contention reasonable? Explain.

What is the airspeed of a laden swallow?

An ice glider, that has a mass of 1640 kg, is initially moving at 20 m/s NW. A wind accelerates the glider at 2.5 m/s? 20° E of N for eight second. Then the wind shifts to 48°E of N accelerating the glider at 1.8 m/s for 11 seconds. 1) What is the glider's initial kinetic energy? 2) What is the glider's velocity at t= 8 s? 3) How much energy did the wind transfer to the glider during the 8 s? 4) What was the glider's velocity after the 11s the second wind gust was active? 5) How much energy did the wind transfer to the glider during the 19s? 6) What was the glider's average speed from t = 0 s to t = 19 s? 7) What was the glider's displacement from t = 0 s to t = 19 s? 8) What was the glider's average velocity from t = 8stot=198? 9) What was the glider's final kinetic energy? 10) A student contends that the glider will have the largest force at t = 19 s since it has the most kinetic energy at that time. Is this contention reasonable? Explain.

An apple is falling down from a height of 20m and then hit a

person. Assume that the mass of the apple is 200g. The

duration of impact is 0.001 sec and that the area of the

bone is 1 cm(square). (a) Calculate the impulsive force applied to

the person. (b) If the rupture strength for body tissue is

about 5 X 1000000dyn/cm(sqare), will the impact force lead to serious

injury for the person?

In a car collision, the bag expands suddenly and cushions

the impact of the passenger. Assume the impact velocity is

105 km/h. For a 70-kg person with a 30-cm allowed

stopping distance, (a) calculate the stopping force per cm(square)

applied to the person, if the average applied force is

uniformly distributed over a 1000-cm(square) area of the

passenger's body. (b) calculate the duration of the collision

between the passenger and the inflated bag of the collision

protection device. (c) If the rupture strength for body tissue

is about 5 X 1000000 dyn/cm(sqare), will the impact force lead to

serious injury for the passenger?

Whiplash usually occurs in [Best answer]

motor vehicle collision.

A.

Head-on

B. Rear-end

C. Roll-over

D. Rotational

A vehicle travelling along a street skidded on an icy patch and hit a roadside barrier the time interval of the impact was 0.955 seconds during which the barrier exerted a force of 505 and what is the magnitude of the change in momentum from the vehicle

A car traveles at a constant speed of 37km/hr round of curve of radius 300m find how long it will take to turn through 180 degree of Arc.

A motor of mass 400kg is mounted on a horizontal shaft which is supported by two equally spaced bearings. If the center of the motor is 1mm out of alignment, find the maximum and minimum load on each bearing when the shaft speed is 10rad/s