When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 834 N and the drag force has a magnitude of 1035 N. The mass of the sky diver is 85.1 kg. Take upward to be the positive direction. What is his acceleration, including sign?

A planet has a mass of 6.70 × 10^{23} kg and a radius of 2.51 × 10^{6} m. **(a)** What is the acceleration due to gravity on this planet? **(b)** How much would a 55.2-kg person weigh on this planet?

The weight of an object is the same on two different planets. The mass of planet A is only 24 percent that of planet B. Find the ratio *r*_{A}/*r*_{B} of the radii of the planets.

A satellites are placed in a circular orbit that is 1.36 × 10^{8} m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?

A 36.7-kg crate rests on a horizontal floor, and a 69.5-kg person is standing on the crate. Determine the magnitude of the normal force that **(a)** the floor exerts on the crate and **(b)** the crate exerts on the person.

A 61.6-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.780 and 0.406, respectively. What horizontal pushing force is required to **(a)** just start the crate moving and **(b)** slide the crate across the dock at a constant speed?

A stuntman is being pulled along a rough road at a constant velocity by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 115 kg, and the coefficient of kinetic friction between the road and him is 0.694. Find the tension in the cable.

How long does it take a plane, traveling at a constant speed of 246 m/s, to fly once around a circle whose radius is 3740 m?

Subject | Science |

Due By (Pacific Time) | 10/02/2015 11:30 pm |

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