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A 63 kg person expends 400 W when walking on a level treadmill at a speed of 10.8 km/h. When the treadmill is inclined without changing the speed, the person's expended power increases to 600 W. Estimate the angle of incline by assuming that all of the increased power output goes into overcoming the force of gravity.
A door has mass M, width W, and height H. It is attached to a door frame by only two hinges: one at 5H/6 (the top hinge) and one at H/6 (the bottom hinge). Calculate the force that the door frame exerts on each hinge
A rifle of mass 10 kg fires a 10 g bullet into a 3 kg block of woodwhich is suspended by a thin wire, forming a ballistic pendulum.The bullet remains embedded in the block of wood, which is observedto swing so that it reaches a vertical height of ..
A 107-kg horizontal platform is a uniform disk of radius 1.85 m and can rotate about the vertical axis through its center. Find the moment of inertia of this system, consisting of the platform and its population, with respect to the axis
A woman is reported to have fallen 139 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 30 in. She suffered only minor injuries.
How many 104W lightbulbs can you use in a 113 V circuit without tripping a 17 A circuit breaker? (The bulbs are connected in parallel that means that the potential difference across each lightbulb is 113V.)
The flowers of the bunchberry plant open with astonishing force and speed, causing the pollen grains to be ejected out of the flower in a mere .3 ms at an acceleration of 2.5 * 104 m/s^2. what is the bee's speed immediately afterward
If 20.0 kcal of heat aresupplied to 6.00 multiplied by 102 gof water at 23°C, what is the final temperature of the water
A square current loop 5.5cm on each side carries a 460mA current. The loop is in a 1.6T uniform magnetic field. What is the magnitude of the torque on the current loop
A mass m = 17.0 kg rests on a frictionless table and accelerated by a spring with spring constant k = 4047.0 N/m. The floor is frictionless except for a rough patch. For this rough path, the coefficient of friction is ?k = 0.42. The mass leaves th..
A 15,000 kg loader traveling east at 20 km/h turns south and travels at 25 km/h. Calculate the change in the loader's
a building is being knocked down with a wrecking ball which is a big metal sphere that swings on a 13-m-long cable. you
What would happen to the gravitational force between Earth and the Sun. A reconnaissance plane flies 600 km away from its base at 240 km/h, then flies back to its base at 320km/h.
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