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A student (m = 64 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Suppose that the only force acting on him during the collision is that due to the ground.
On a level road with its brakes on, a car traveling at 93km/hr stops within 92m when the brakes lock and the car slides.
Many people mistakenly believe that the astronauts that orbit Earth are "above gravity." Calculate g for space shuttle territory 150 km above Earth's surface. suppose Earth's mass is 6.0 1024 kg, and its radius is 6.38 106 m (6380 km). Your answer..
A molecule of DNA (deoxyribonucleic acid) is 2.05 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.88% upon becoming charged. Determine th..
In a charming 19th-century hotel, an old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 3.50 m in diameter. The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim ..
A force vector has a magnitude of 569 newtons and points at an angle 41o of below the positive x axis. What is (a) x scalar component and (b) y scalar component of the vector.
Planet Z is 12,000 km in diameter. The acceleration due to gravity on Planet Z is 7.0 m/s2.
An object moves with constant acceleration 5.00 m/s2 and over a time interval reaches a final velocity of 11.2 m/s. (a) If its initial velocity is 5.6 m/s, what is its displacement during the time interval?
An oscillator with a mass of 420 g and a period of 0.900 s has an amplitude that decreases by 1.90 percent during each complete oscillation.
What is the magnitude of the runner's total displacement . What is the phase difference between the two waves next they reach the observer.
A whale swims due east for a distance of 1.5 km, turns around and goes due west for 5.7 km, and finally turns around again and heads 4.5 km due east. (a) What is the total distance traveled by the whale? km (b) What are the magnitude and direction..
If a metric ton is 1.000 x10^e3 kg, how many 74 kg people can safely occupy an elevator that can hold a maximum mass of accurately 1 metric ton.
At t1 = 5.00 s, the acceleration of a particle moving at constant speed in counterclockwise circular motion is a1=(2m/s^2)i + (9m/s^2)j At t2 = 6.00 s (less than one period later), the acceleration is a2= (9m/s^2)i - (2m/s^2)j The period is more t..
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