4. A 75kg skydiver has a velocity of 55 m/s at an altitude of 900m above...
A skydiver jumps out of an airplane at a high altitude and reaches terminal speed. Which of the following statements about the falling skydiver at terminal speed is FALSE? The air resistance force does negative work on the skydiver. The gravitational force on the skydiver must be larger than the air resistance force in order to maintain a downward velocity. At terminal speed, the kinetic energy of the skydiver is constant. The thermal energy of the skydiver-Earth-atmosphere system is increasing....
#4 and #5!!
4. A 55 kg box rests on a horizontal surfcion betwce the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20. What horizontal force must be applied to the box to cause it to start sliding along the surface? 4 :0 ovit 5. A projectile is launched at ground level with an initial speed of 50.0 m/s at an angle of 300 above the horizontal. It strikes a target above the ground...
A 11 kilogram toy helicopter hovers at an altitude of 87 meters above the surface of the earth. The helicopter climbs to a new altitude of 135 meters and attains a velocity of 17 m/s. Calculate the helicopter's change in potential energy in joules.
Note that the answer is
not:
- 0 m/s^2
- 7.848 m/s^2
A skydiver jumps off of an airplane. The plane flies at an altitude of 4 km, and at a speed of 100 km/hr. The skydiver "jumps" by simply letting go of the plane and falling out. Gravity is the only thing affecting their motion until they open their parachute at a height of 2.5 km. After opening their parachute, they experience constant acceleration until they land perfectly, with...
A 3 kg Jack-O-Lantern is flying at 2 m/s at a height of 55 m. What is its total energy (kinetic + potential) if the total was 0 when the Jack-O-Lantern was at rest on the ground?
A parachutist whose mass is 75kg 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 proportionality constant b1=30 N-sec/m when the chute is closed and b2=90 N-sec/m when the chute open. If the chute does not open until the velocity of the parachutist reaches 20 m/sec, after how many seconds will she reach the ground use g=9.81
4) A ball with a mass of 0.15 kg has a velocity of 5 m/s. It strikes a wall perpendicularly and bounces off straight back with a velocity of 2 m/s. The ball underwent a change in momentum equal to (There is only one answer) (2p) A) 0.20 kg. m/s B) 1.20 kg. m/s C) 1.05 kg. m/s D) 6 kg. m/s E) 8.5 kg. m/s 5) A 2-kg mass moving with a velocity of 6 m/s collides elastically with...
A space elevator has an altitude above the Earth's surface of 40,000 km. What would be the kinetic energy of a 1kg mass at the end of our space elevator? What would be the gravitational potential energy of that mass? If the 1 kg object fell all the way down to the Earth's surface, what would be its speed just before impact? (The radius of Earth is 6.4 x 106 m).
At a certain instant after jumping from airplane A, skydiver B is in the position shown and has reached a terminal (constant) speed vg = 50 m/s. The airplane has the same constant speed VA = 50 m/s, and after a period of level flight is just beginning to follow the circular path shown by radius ρ = 2000 m. (a) Determine the velocity and acceleration of the airplane relative to the skydiver. (b) Determine the time rate of change...
An airplane is flying horizontally with a constant velocity of 200 m/s at an altitude of 5200 m when it drops a package. How long does it take for the package to reach the ground? ______s What is the distance between the airplane and the package when the package hits the ground? Ignore air resistance. ______m How far ahead of the target along the x direction should the plane be when it releases the package? _______m