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Q. A 68-{rm kg} skier is on flat snow waiting in line for a ski lift. While goofing around, he bends forward stiffly, as shown in the figure. To hold this position, tension in his back muscles must support the weight of his upper body. His upper body has 55 percent of his mass, and the center of gravity of his upper body is 43-{rm cm} from his hips, in the middle of his trunk. What torque do his back muscles exert about an axis through his hips?
A 5.00 mL syringe has an inner diameter of 6.00 mm, a needle inner diameter of 0.210 mm, and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100..
An ideal spring with a stiffness of 379N/m is attached to a wall, and its other end is attached to a block that has a mass of 16-kg. The spring/block system is then stretched away from the spring's relaxed position until 59J of mechanical potentia..
What was the power of the motor that kept the wheel rotating at 6.5 rev/hr in spite of friction.
Determine the tension in each string
Choose the correct explanation for why you can determine the maximum load given that theta_min is the minimum angle crane arm can make with the horizontal.
A 21 kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 80.5 N and is directed at an angle of 30° above the horizontal. Determine the coefficient of kinetic friction.
A small steel ball with a mass of 80 g is releasesd from a resting height of 1.25 m above a ridgid metal plate. What is the velocity of ball before impact.
A classroom slide projector projects an enlarged (55 times taller) image of a 24 mm high photographic film onto a screen located 10 meters from the projector. What focal length lens (cm) does slide projector require to produce a sharply focus imag..
A person pulls a 26kg suitcase using a rope attached to the suitcase at an angle of 28 degrees to the horizontal. The coefficient of static friction of the suitcase with the floor is 0.3 and the coefficient of kinetic friction is 0.20.
A piece of Nichrome wire has a radius of 5.00 x10-4 m. It is used in a laboratory to make a heater that uses 2.00 102 W of power when connected to a voltage source of 120 V. Ignoring an effect of temperature on resistance, estimate the necessary l..
How many joules of kinetic energy does a 750-{rm kg} automobile travelling at the typical highway speed of 65 {rm{ mi/h}} have.
A car started frm rest and accelerated for 5s at 6.00m/s2.Then it stayed at a constant speed for 20 s. It next slowed down at 3m/s2 until it came to a stop? how far did it travel during the first 5 s.
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