A skier slides down a ski jump then launches into the air.
Which
set of vectors most correctly indicates the direction of the
skier's net acceleration at the numbered points? Ignore any
friction or air resistance.
Homework Answers
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A skier slides down a ski jump then launches into the air.
Which
set of vectors...
Choose the Correct Answer: 1. A skier leaves a ski jump with a horizontal velocity of...
Choose the Correct Answer: 1. A skier leaves a ski jump with a horizontal velocity of 27.0 m/s (and no vertical velocity component). The skier lands 2.50 seconds later. What is the magnitude of the skier's displacement during the jump (a) 67.5 m (b) 98.2 m (c) 74.1 m (d) 30.7 m 2. The x and y positions (in meters) of a particle are given by: x(t) 253 t, and y(t)-12.0 t2+ 155 t100. The speed of the particle at...
Need the exercise portion Hit the Ski Slopes EXAMPLE 5.8 GOAL Combine conservation of mechanical energy...
Need the exercise portion
Hit the Ski Slopes EXAMPLE 5.8 GOAL Combine conservation of mechanical energy with the work-energy theorem involving friction on a horizontal surface. h = 20.0 m у A skier starts PROBLEM from rest at the top of a frictionless incline of height (В С) 20.0 m, as in the figure. At the bottom of the incline, the skier The skier slides down the slope and onto a level surface, stopping after encounters a horizontal traveling a...
Ionsider the ski jump track shown in Figure 2 below. The radius of curvature of the...
Ionsider the ski jump track shown in Figure 2 below. The radius of curvature of the track is r= 60 [m] and the ski jumper's mass is 65 [kg]. The ski jumper's angular displacement, 6 is defined from the horizontal as shown. The ski jumper goes along the ski jump track for 6 = 120° before launching at an angle B = 30° above the horizontal. r=60[m] 0 0=120° LAUNCH POINT ski jumper B -GROUND Figure 2: Ski jumper attempting...
A hockey puck slides on ice (looking down on the ice from above; blue arrows are...
A hockey puck slides on ice (looking down on the ice from above; blue arrows are momentum, red line shows path); friction and air resistance are negligible. When the puck reaches location 2 it is struck hard by a hockey stick; the contact lasts a very short time. It then travels from 2 to 3 at nearly constant momentum. The magnitude of the puck's momentum is the same at locations 1 and 3. Which green arrow best indicates the direction of...
A person launches a home-built rocket straight up into the air. At time ?=0 s the...
A person launches a home-built rocket straight up into the air. At time ?=0 s the rocket is at rest at ?&=0 m with ?&=0 m/s. The position of the rocket is given by ?(?)=1 2(?&−?)?/− ?& 12?& /?0, 0<?<?&, where ?& is a positive constant and ? is the acceleration of gravity. ?& is the time that it takes the fuel to burn out. a) (2 points) Model: How are you going to model this problem? b) (3 points)...
Use Matlab... Use given variables... %Set values of parameters H0 = 4000 ; v0 = 0; vplane = 38.9...
Use Matlab... Use given variables...
%Set values of parameters
H0 = 4000 ;
v0 = 0;
vplane = 38.9;
vwind = 7.0;
g = -9.81;
td = 45;
dt = 0.1;
%initial conditions
%To minimize edits, let v = vertical velocity, and vx = horizontal
velocity
y(1) = H0;
v(1) = v0;
t(1) = 0;
x(1) = 0;
vx(1) = vplane;
%loop until parachutist reaches the ground
%Calculate te horizontal distance traveled before and after the
parachute opens
d_free =...
1) Consider a pendulum of constant length L to which a bob of mass m is attached. The Q6. pendulum moves only in a two-dimensional plane (see figure below). The polar frame of reference attached to t...
1) Consider a pendulum of constant length L to which a bob of mass m is attached. The Q6. pendulum moves only in a two-dimensional plane (see figure below). The polar frame of reference attached to the bob is defined by er,ce where er is the unit vector orientecd away from the origin and e completes the direct orthonormal basis. The pendulum makes an angle 0(t) between the radial direction and the vertical direction e(t) The position vector beinge ind...
4.0 m Question 4: A 2.0 kg particle slides down from rest from position A. When...
4.0 m Question 4: A 2.0 kg particle slides down from rest from position A. When it reaches B, it enters a rough horizontal segment with f4k-0.20, and eventually comes to rest at D. The surface from A to B is frictionless, and point A is located 4.0 m above the ground (a) Draw a free body diagram (FBD) for the particle at A (b) Draw a free body diagram (FBD) for the particle at C (c) Is the total...
1) Let's practice calculating the frictional force of a skier on old "woody" skis and wet...
1) Let's practice calculating the frictional force of a skier on old "woody" skis and wet snow. The skier has a mass of 58 kg. The coefficient of kinetic friction of wood skis on wet snow is 0.1 Notice there are no units for the coefficient of friction. What is the kinetic frictional force between the wood skis and the snow? Answer: ?? 2) Do you remember Newton's 2d Law? F = ma? What is the magnitude (meaning we are...
By now, you may be getting sick of hearing that we may ignore air resistance" in...
By now, you may be getting sick of hearing that we may ignore air resistance" in problems. We did that before because we did not have knowledge of forces. But now... Let's see just how powerful air resistance is on Earth. Assuming that we are standing on the surface of Earth, let's find the fractional difference between the maximum heights reached for each case. 1. Simple case first: a ball thrown upwards without air. Find an expression for the maximum...
Choose the Correct Answer: 1. A skier leaves a ski jump with a horizontal velocity of 27.0 m/s (and no vertical velocity component). The skier lands 2.50 seconds later. What is the magnitude of the skier's displacement during the jump (a) 67.5 m (b) 98.2 m (c) 74.1 m (d) 30.7 m 2. The x and y positions (in meters) of a particle are given by: x(t) 253 t, and y(t)-12.0 t2+ 155 t100. The speed of the particle at...
Need the exercise portion
Hit the Ski Slopes EXAMPLE 5.8 GOAL Combine conservation of mechanical energy with the work-energy theorem involving friction on a horizontal surface. h = 20.0 m у A skier starts PROBLEM from rest at the top of a frictionless incline of height (В С) 20.0 m, as in the figure. At the bottom of the incline, the skier The skier slides down the slope and onto a level surface, stopping after encounters a horizontal traveling a...
Ionsider the ski jump track shown in Figure 2 below. The radius of curvature of the track is r= 60 [m] and the ski jumper's mass is 65 [kg]. The ski jumper's angular displacement, 6 is defined from the horizontal as shown. The ski jumper goes along the ski jump track for 6 = 120° before launching at an angle B = 30° above the horizontal. r=60[m] 0 0=120° LAUNCH POINT ski jumper B -GROUND Figure 2: Ski jumper attempting...
Use Matlab... Use given variables...
%Set values of parameters
H0 = 4000 ;
v0 = 0;
vplane = 38.9;
vwind = 7.0;
g = -9.81;
td = 45;
dt = 0.1;
%initial conditions
%To minimize edits, let v = vertical velocity, and vx = horizontal
velocity
y(1) = H0;
v(1) = v0;
t(1) = 0;
x(1) = 0;
vx(1) = vplane;
%loop until parachutist reaches the ground
%Calculate te horizontal distance traveled before and after the
parachute opens
d_free =...
1) Consider a pendulum of constant length L to which a bob of mass m is attached. The Q6. pendulum moves only in a two-dimensional plane (see figure below). The polar frame of reference attached to the bob is defined by er,ce where er is the unit vector orientecd away from the origin and e completes the direct orthonormal basis. The pendulum makes an angle 0(t) between the radial direction and the vertical direction e(t) The position vector beinge ind...
4.0 m Question 4: A 2.0 kg particle slides down from rest from position A. When it reaches B, it enters a rough horizontal segment with f4k-0.20, and eventually comes to rest at D. The surface from A to B is frictionless, and point A is located 4.0 m above the ground (a) Draw a free body diagram (FBD) for the particle at A (b) Draw a free body diagram (FBD) for the particle at C (c) Is the total...
By now, you may be getting sick of hearing that we may ignore air resistance" in problems. We did that before because we did not have knowledge of forces. But now... Let's see just how powerful air resistance is on Earth. Assuming that we are standing on the surface of Earth, let's find the fractional difference between the maximum heights reached for each case. 1. Simple case first: a ball thrown upwards without air. Find an expression for the maximum...
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