In downhill speed skiing a skier is retarded by both the air drag force on the...
In downhill speed skiing a skier is retarded by both the air drag force on the body and the kinetic frictional force on the skis. Suppose the slope angle is θ = 32.5°,
the snow is dry snow with a coefficient of kinetic friction μk = 0.0400, the mass of the skier and equipment is m = 78.5 kg, the cross-sectional area of the (tucked) skier is A = 1.30 m2, the drag coefficient is C = 0.150, and the air density is 1.20 kg/m3. (a) What is the terminal speed? 56.818 Correct: Your answer is correct. m/s (b) If a skier can vary C by a slight amount dC by adjusting, say, the hand positions, what is the corresponding variation in the terminal speed (dvt/dC)?
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In downhill speed skiing a skier is retarded by both the air
drag force on the...
Question 1 1 pts A snow skier is racing directly downhill on snow with a kinetic...
Question 1 1 pts A snow skier is racing directly downhill on snow with a kinetic friction coefficient (between the snow and the skis) of 0.05. The angle of the slope is 40 degrees. The mass of the skier and ski equipment is 78 kg, the skier's cross-sectional area (in a "tucked" position) is 1.4 m2, the drag coefficient with respect to the air is 0.14 and the air's density Pair =1.21 kg/m3. What is the skier's terminal speed going...
A skier is skiing downhill. The slope is inclined at 10o with respect to the horizontal....
A skier is skiing downhill. The slope is inclined at 10o with respect to the horizontal. The skier’s mass is 65 kg and the value of the coefficient of kinetic friction between the skis and the snow is 0.18. What is her acceleration? a. 0.035 m/s2 uphill b. 0.0036 m/s2 uphill c. 0.0 m/s2 d. 0.95 m/s2 downhill
What is the terminal speed for a 79 kg skier going down a 37 ∘ snow-covered...
What is the terminal speed for a 79 kg skier going down a 37 ∘ snow-covered slope on wooden skis μk= 0.060? Assume that the skier is 1.8 m tall and 0.50 m wide. Assume the skier's drag coefficient is 0.80.
What is the terminal speed for an 85 kg skier going down a 35 ∘ snow-covered...
What is the terminal speed for an 85 kg skier going down a 35 ∘ snow-covered slope on wooden skis μk= 0.060?Assume that the skier is 1.8 m tall and 0.50 m wide. Assume the skier's drag coefficient is 0.80.
A skier going down a slope of angle θ below the horizontal is opposed by a...
A skier going down a slope of angle θ below the horizontal is opposed by a turbulent drag force that the air exerts on the skier and by a kinetic friction force that the snow exerts on the skier. The mass of the skier is m. Determine the terminal speed assuming that the coefficient of kinetic friction between the skis and the snow is μ, the density of air is ρ, the skier's frontal area is A, and the drag...
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...
NAME: [1.) (20 pts) (Work-Energy Theorem) A 67.0 kg skier on a horizontal patch of snow...
NAME: [1.) (20 pts) (Work-Energy Theorem) A 67.0 kg skier on a horizontal patch of snow skiing at an initial speed of 11.0 m/s coasts to a stop after 177 m. (a.) Use the Work-Energy Theorem to find the coefficient of kinetic friction, H., between the skis and the snow. (6.) Suppose a 75.0 kg skier with three times the initial speed coasted to a stop over the same distance. Find the coefficient of kinetic friction between that skier's skis...
An air-track glider of mass 0.100 kg is attached to the end of a horizontal air track by a spring with force constant 20.0 N/m. Initially the spring is unstreched and the glider is moving at 1.50 m/s...
An air-track glider of mass 0.100 kg is attached to the end of a horizontal air track by a spring with force constant 20.0 N/m. Initially the spring is unstreched and the glider is moving at 1.50 m/s to the right. With the air track turned off, the coefficient of kinetic friction is μk=0.47. It can be shown that with the air track turned off, the glider travels 8.6 cm before it stops instantaneously. How large would the coefficient of...
QUESTION 9 To maintain a constant speed, the force provided by a car's engine must equal...
QUESTION 9 To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). What is the drag force at 57.2 MPH for a Hummer H27 (Drag area for Hummer is 2.44 m2 and look up Table 5.2, chap-5 for the drag coefficient) Express your answer in N with 3 significant figures. QUESTION 10 Calculate the terminal velocity a spherical rain drop, diameter 4.06...
2. Suppose a car travels 108 km at a speed of 20.0 m/s, and uses 2.20...
2. Suppose a car travels 108 km at a speed of 20.0 m/s, and uses
2.20 gallons of gasoline. Only 30% of the gasoline goes into useful
work by the force that keeps the car moving at constant speed
despite friction. (The energy content of gasoline is 1.3 ✕
108 J per gallon.)
(a) What is the force exerted to keep the car moving at constant
speed?
N
(b) If the required force is directly proportional to speed, how
many...
Question 1 1 pts A snow skier is racing directly downhill on snow with a kinetic friction coefficient (between the snow and the skis) of 0.05. The angle of the slope is 40 degrees. The mass of the skier and ski equipment is 78 kg, the skier's cross-sectional area (in a "tucked" position) is 1.4 m2, the drag coefficient with respect to the air is 0.14 and the air's density Pair =1.21 kg/m3. What is the skier's terminal speed going...
NAME: [1.) (20 pts) (Work-Energy Theorem) A 67.0 kg skier on a horizontal patch of snow skiing at an initial speed of 11.0 m/s coasts to a stop after 177 m. (a.) Use the Work-Energy Theorem to find the coefficient of kinetic friction, H., between the skis and the snow. (6.) Suppose a 75.0 kg skier with three times the initial speed coasted to a stop over the same distance. Find the coefficient of kinetic friction between that skier's skis...
QUESTION 9 To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). What is the drag force at 57.2 MPH for a Hummer H27 (Drag area for Hummer is 2.44 m2 and look up Table 5.2, chap-5 for the drag coefficient) Express your answer in N with 3 significant figures. QUESTION 10 Calculate the terminal velocity a spherical rain drop, diameter 4.06...
2. Suppose a car travels 108 km at a speed of 20.0 m/s, and uses
2.20 gallons of gasoline. Only 30% of the gasoline goes into useful
work by the force that keeps the car moving at constant speed
despite friction. (The energy content of gasoline is 1.3 ✕
108 J per gallon.)
(a) What is the force exerted to keep the car moving at constant
speed?
N
(b) If the required force is directly proportional to speed, how
many...
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