A parachutist whose mass is 80 kg drops from a helicopter hovering 2000 m above the...

A parachutist whose mass is 80 kg drops from a helicopter hovering 2000 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b1=20 N-sec/m when the chute is closed and b2=100 N-sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 35 m/sec, after how many seconds will the parachutist reach the ground? Assume that the acceleration due to gravity is 9.81 m/s^2.

Expert Solution

Please feel free to ask doubts in the comment section and give it a thumbs up if you liked the answer. Have a good day

Colby Messinger answered 2 years ago

A parachutist whose mass is 65 kg drops from a helicopter hovering 2000 m above the...

A parachutist whose mass is 65 kg drops from a helicopter hovering 2000 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b1 = 20 N-sec/m when the chute is closed and b2 = 90 N-sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 25...

A parachutist whose mass is 80 kg drops from a helicopter hovering 1000 m above the...

A parachutist whose mass is 80 kg drops from a helicopter hovering 1000 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b1 = 30 N-sec/m when the chute is closed and b2 = 90 N-sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 20...

A parachutist whose mass is 85 kg drops from a helicopter hovering 1000 m above the...

A parachutist whose mass is 85 kg drops from a helicopter hovering 1000 m above the ground and falls towards the ground under the influence of gravity. Assume that the force due to air resistance is proportional to velocity of the parachutist, with the proportionality constant b1=20 N-sec/m when the chute is closed and b2=90 N-sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 35 m/sec, after how many seconds...

A parachutist whose mass is 65 kg drops from a helicopter hovering 1500 m above the...

A parachutist whose mass is 65 kg drops from a helicopter hovering 1500 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b1 = 30 N-sec/m when the chute is closed and b2= 100 N-sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 15 m/sec,...

A container with mass m kg is dropped by a helicopter from height h km at...

A container with mass m kg is dropped by a helicopter from height h km at time t=0, with zero velocity. from the outset, its fall is controlled by gravity and the force of air resitance, f(v)= -kv, where v is the current velocity of the container. in t seconds after the drop, a parachute opens, resulting in an increase of air resistance up to f(v) = -kv. determine the time t at which the container touches the ground. and...

An object of mass 2 kg is released from rest from a platform 30 m above...

An object of mass 2 kg is released from rest from a platform 30 m above the water and allowed to fall under the influence of gravity. After the object strikes the water, it begins to sink with gravity pulling down and a buoyancy force pushing up. Assume that the force due to gravity (g = 9.81 m/s2) is constant, no change in momentum occurs on impact with the water, the buoyancy force is 1/2 the weight (weight=mg), and the...

A uniform helicopter rotor blade is 8.97 m long, has a mass of 104 kg, and...

A uniform helicopter rotor blade is 8.97 m long, has a mass of 104 kg, and is attached to the rotor axle by a single bolt. (a) What is the magnitude of the force on the bolt from the axle when the rotor is turning at 329 rev/min? (Hint: For this calculation the blade can be considered to be a point mass at its center of mass. Why?) (b) Calculate the torque that must be applied to the rotor to...

A mass of 0.3 kg hangs motionless from a vertical spring whose length is 1.05 m...

A mass of 0.3 kg hangs motionless from a vertical spring whose length is 1.05 m and whose unstretched length is 0.40 m. Next the mass is pulled down to where the spring has a length of 1.30 m and given an initial speed upwards of 1.9 m/s. What is the maximum length of the spring during the motion that follows?

A mass of 0.3 kg hangs motionless from a vertical spring whose length is 0.88 m...

A mass of 0.3 kg hangs motionless from a vertical spring whose length is 0.88 m and whose unstretched length is 0.48 m. Next the mass is pulled down to where the spring has a length of 1.08 m and given an initial speed upwards of 1.9 m/s. What is the maximum length of the spring during the motion that follows?

A block with a mass m = 2.12 kg is pushed into an ideal spring whose...

A block with a mass m = 2.12 kg is pushed into an ideal spring whose spring constant is k = 3580 N/m. The spring is compressed x = 0.073 m and released. After losing contact with the spring, the block slides a distance of d = 1.71 m across the floor before coming to rest. A.) Write an expression for the coefficient of kinetic friction between the block and the floor using the symbols given in the problem statement...

Question