An 80.0-kg skydiver jumps out of a balloon at an altitude of 1 000 m and opens his parachute at an altitude of 200 m. (a) Assuming the total retarding force on the skydiver is constant at 50.0 N with the parachute closed and constant at 3 600 N with the parachute open, find the speed of the skydiver when he lands on the ground. (b) Do you think the skydiver will be injured? Explain. (c) At what height should the parachute be opened so that the final speed of the skydiver when he hits the ground is 5.00 m/s? (d) How realistic is the assumption that the total retarding force is constant? Explain.

Q: Coal is lifted out of a mine a vertical distance of 50 m by an engine that supplies 500 W to a…

A:

Q: A child pulls on a wagon with a horizontal force of 75N. If the wagon moves horizontally a total of…

A:

Q: A 36.0-kg crate, starting from rest, is pulled across a floorwith a constant horizontal force of 225…

A: According to the work-energy theorem, the changing in kinetic energy of the crate must be equal to…

Q: A small object with mass m = 0.0900 kg moves along the +x-axis. The only force on the object is a…

A: Given that, Mass of the object is m = 0.0900 kg Potential function, Ux=-αx2+βx3, where α=2.00 J/m2…

Q: A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the…

A: Given:- mass of object is 20 kg  height above the ground is 8 m  Find:- potential energy?

Q: B/ A tennis of mass 59 g is thrown vertically upwards with an initial velocity of 200 km/hr.…

A: Given : m = 59 g = 0.059 kg vi = 200 km/hr = 200(1000/3600) = 55.56 m/s

Q: A 5.0-kg block is pushed 3.0 m up a vertical wall with con- stant speed by a constant force of…

A: Figure shows the force acting on the block.

Q: *Chapter 8, Problem 62 In the figure a block slides along a path that is without friction until the…

A: Speed at point b V = 10.18 m/s

Q: A 2.1 × 103 -kg car starts from rest at the top of a 5.0-m-long driveway that is inclined at 20°…

A: Given data: Mass of car, m = 2.1 × 103 kg Length of driveway, L = 5 m  angle of inclination, θ = 20°…

Q: The maximum speed of a lorry of mass 3000kg moving on a level road against a non- gravitational…

A:

Q: A roller-coaster car is moving at 4.12 m/s along a straight horizontal track before entering the…

A: Given Data:- Speed of the car before entering the first drop is vA=4.12 m/s Height of the point A is…

Q: A single force F(x) = −8.0x (in newtons) acts on a 3.0-kg body. When x = 6.75 m, the speed of the…

A: Given, Force, Fx = -8xMassm = 3 kg , when x = 6.75 m  , v = 4 m/swhen x=2.5m , v = ?

Q: A 200-g steel ball is tied to a 2.00-m “massless” string and hung from the ceiling to make a…

A: We draw a diagram according to the question. Also take  dotted line below the figure as a reference…

Q: The figure here shows a plot of potential energy U versus position x of a 0.898 kg particle that can…

A: Given that The figure here shows a plot of potential energy U versus position x of a 0.898 kg…

Q: If a car generates 17.3 hp when traveling at a steady 81.3 km/hr, what must be the average force…

A:

Q: At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at…

A: The law of energy conservation,

Q: A 1300-kg car moving on a horizontal surface has speed y = 50 km/h when it strikes a horizontal…

A: The kinetic energy will equal to the elastic potential energy. mv22=kx22

Q: A 100 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 200…

A: Given value--- mass = 100 kg. horizontal force = 200 N. first distance = 15 m. second distance = 15…

Q: What is the speed of a 14 kN body at rest then falling from a height of 238 m.

A: During free fall if the air resistance is neglected the final velocity of a body dropped from a…

Q: A 98 kg bicyclist traveling 15 m/s coasts up a 5 m high incline. After reaching the top of the…

A:

Q: A car of mass 920.0 kg accelerates away from an intersection on a horizontal road. When the car…

A: mass of car (m) = 920 kg speed (v) = 12.4 msNet power (P) = 5300 W

Q: You drag your 30 kg suitcase 1200 m thru the Chicago airport at essentially constant velocity 2.0…

A: Given: Mass, M = 30kg Distance , s= 1200m Velocity, v = 2.0m/s Force, F = 90N, 20o westward

Q: A 2.1 x 103-kg car starts from rest at the top of a 5.5-m-long driveway that is inclined at 15° with…

A: Given Data : The mass of the car is given as M=2.1×103 Kg The length of the driveway is given as D =…

Q: car (m = 660.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a…

A: Given Mass of the car is m=660.0 kg Height of the hill is h=39.0 m Final speed of the car is vf=24.9…

Q: A 8kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 230N.…

A:

Q: A 26 kg object is acted on by a conservative force given by F = (-2.9)x + (-5.9)x2, with F in…

A:

Q: A basketball player throws a basketball m = 1 kg straight up with an initial speed of v0 = 9.5 m/s.…

A: Given,

Q: A proton (mass m = 1.67 × 10-27 kg) is being accelerated along a straight line at 2.70 × 1011 m/s2…

A: (a)consider the kinematic equation.Vf2=v02 +2as                (i)             where,     vf=final…

Q: The figure here shows a plot of potential energy U versus position x of a 0.878 kg particle that can…

A: (a)Let the velocity at x = 1.0 m be vWe know:                          Total energy = kinetic energy…

Q: Q.2 A 1.00 x 10*3 kg elevator car carries a maximum load of 8.00 x 10*2 kg. A constant frictional…

A:

Q: As shown in the figure below, a 2.25-kg block is released from rest on a ramp of height h. When the…

A: mass of block= 2.25 kg Coefficient of Kinetic friction= μk=0.6 rough patch width, s= 15 cm or 0.15m

Q: Given: A shooting guard throws a basketball m = 1 kg straight up with an initial speed of v0 = 5.5…

A: Given - m=1kg vo=5.5m/s  ho= 1.95m Gravitational potential energy be zero at ground

Q: A 150 [g] particle at x = 0 is moving at 2.00 [m/s] in the +x-direction. As it moves, it experiences…

A: The expression for the work done, W=∫x1x2Fxdx   Substitute,…

Q: A.2.1x 10-kg.car starts from rest at the top of a 5.8-m-long driveway that is inclined at 15° with…

A: Given data: Mass of car (m) = 2.1×103 kg Displacement along driveway (d) = 5.8 m Angle with…

Q: Q.2 A- A 0.750 x 10**3 kg elevator car carries a maximum load of 7.500 x 10**2 kg. A constant…

A:

Q: If the force on an object is zero, does that mean the potentialenergy of the system is zero? If the…

A: Step 1 The relation between force and potential energy is, The negative of derivative potential…

Q: How high a hill can a car coast up (engine disengaged) if work done by friction is negligible * and…

A: Given data:  Initial Speed of the car (V0) = 155 km/h Free falling acceleration (g) = 10 m/s2…

Q: potential energy of a body

A:

Q: What is the change in gravitational potential energy for a 40 [kg] block that is raised 5 [m]…

A:

Q: A 0.5-kg ball is thrown with a speed of 15.6 m/s at an angle 37.7 degrees. How high does it go? To…

A: Given: Mass of the ball m = 0.5 kg. The initial velocity of the ball v = 15.6 m/s. Angle of…

Q: A body is falling freely under the action of gravity alone in vacuum. Which of the following…

A: We will answer first question only.

Q: A small plane tows a glider at constant speed and altitude. If theplane does 2.00 * 105J of work to…

A: The work to tow the gliider is 2×105 J. The length of the glider is d=145 m. The tension force is…

Q: A snowboarder with a mass of 98kg is initially stationary on a hilltop, then slides down on the…

A: jjjjjjjj

Q: A parachutist weighing m=70Kg (including equipment) falls vertically from a height of 1500 meters…

A: Given data: The mass of parachutist is m=70 kg. The height from ground is h=1500 m. The time after…

Q: A block with mass m = 0.10 kg is released from rest at point y = 1.0 m and slides down along a…

A: Given Mass of block m = 01 kg height y = 1 m track is friction less