Q 6.28: As a 3.3-N apple falls from a 3.5-m tree under the influence of gravity,...
Part 1 A gust of wind blows an apple from a tree. As the apple falls, the force of gravity on the apple is 9.27 N downward, and the force of the wind on the apple is 1.37 N to the right. What is the magnitude of the net external force on the apple? Answer in units of N. Part 2 What is the direction of the net external force on the apple (measured from the downward vertical, so that...
- Part A-An apple falls from a tree and drops straight to the ground. Its initial height was 1.1 m, and its speed just before hitting the ground was 3.5 m/s. If air resistance does -8.0x10-2 J of work on the apple, what is the mass of the apple? 2.5x10-2 kg 1.7x10-2 kg 4.7x10-3 kg 3.2x10-2 kg
A skydiver of mass m jumps from a hot air balloon and falls a distance d before reaching a terminal velocity of magnitude v . Assume that the magnitude of theacceleration due to gravity is g .-What is the work (Wd) done on the skydiver, over the distance , by the drag force of the air?-Find the power (P d) supplied by the drag force after the skydiver has reached terminal velocity v.
A book moves 2.40 m in the +x-direction under the influence of a 45.7 N force, also in the +x-direction. What is the work done on the book?
A 300-kg piano slides 3.5 m down a 23 ∘ incline and is kept from accelerating by a man who is pushing back on it parallel to the incline.(Figure 1) Determine the force exerted by the man. Determine the work done by the man on the piano. Determine the work done by the force of gravity. Determine the net work done on the piano. Ignore friction.
A parachutist whose mass is 60 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 b 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, after...
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
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 b 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 m/sec, after...
A point particle with mass M moves along a straight line under the influence of a net force that is a function of time, given by: Fx=Bt2, where B is positive and constant. a) If the particle starts from rest, find how long it will take it to cover a distance L. b) Find the speed of the particle after it has traveled a distance L. c) Find the work done on the particle by the net force over the...
A bullet with a mass of 5.04 g and a speed of 597 m/s penetrates a tree to a depth of 4.05 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. N (b) Assuming that the frictional force is constant, determine how much time elapsed between the moment the bullet entered the tree and the moment it stopped. s A force F = (3x i + 4y j) N acts on an...