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Question: A parachutist whose mass is 75kg drops from a helicopter hovering 4000m above the ground and falls toward the earth under the influence of gravity. Assume the gravitational force is constant. Assume also that the force due to the air resistance is proportional to the velocity of the parachutist with the proportionality constant b_1 = 15N sec/m when the chute is close and b_2 = 105N sec/m when the chute is open. If the chute does open 1 min after the parachutist leaves the helicopter after how many seconds will he hit the ground? Answer the differential equation way please!
The electric field between the plates of a paper-separated capacitor is 8.18×104 . The plates are 1.90 apart, and the charge on each plate is 0.750. Determine the area of each plate
A cubical box with sides of length 0.305 m contains 1.760 moles of neon gas at a temperature of 285 K. What is the average rate (in atoms/s) at which neon atoms collide with one side of the container? The mass of a single neon atom is 3.35x10-26 kg
the crate shown is held against wedge b by a spring. the spring is 96.0 of its original uncompressed length l2.75m and
The density of liquid nitrogen is 0.808-g/mL. A tablespoon of liquid nitrogen (35-mL) is placed in a 1.0-L thermos flask and sealed. The flask is left forgotten in the back of a lab at 20-°C. What pressure builds up in the flask (give your answer in ..
A child throws a stone from the top of a 15 m cliff with a speed of 20 m/s. find its kinetic energy and speed when it lands on the ground
A passenger on a moving train walks at a speed of 1.8 m/s due north relative to the train. What are the magnitude and direction(west of north) of the velocity of the train relative to the ground
A typical electric hair dryer designed to operate at 120 -v house sold circuit is rated at 1500 W. What is the resistance of the Dryer?
A 0.275 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.220 kg puck that is initially moving along the x axis with a velocity of 2.18 m/s, Determine the velocity of the 0.275 kg puck after the collsion
A 500-turn solenoid, 25 cm long, has a diameter of 2.5 cm. what will be the induced emf in the short coil during this time
A meter stick is supported on a fulcrum at the 17 cm mark. A 0.70 kg object is hung from the zero end of the meter stick, What is the mass of the meter stick
Two objects of masses m1=0.56 kg and m2=0.88 kg are placed on a horizontal frictionless surface and a compressed spring of spring constant k=280 N/m is placed between them. find the final velocity of each object
The rechargeable batteries for a laptop computer need a much smaller voltage than what a wall socket provides. There fore, atransformer is plugged into the wall socket and produces the necessary voltage for charging the batteries.
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