1. A swimmer is attempting to cross the James River. She enters the water and begins...
1. A swimmer is attempting to cross the James River. She enters the water and begins paddling at a velocity of 2m/s (north). There is a cross current in the river that travels 1.4 m/s (east). How fast will this swimmer be traveling, and in what direction compared to the horizontal will she be going?
2. The James River is 30 meters across. If the swimmer in problem #1 ended up 10 meters to the right of the point she aimed for when starting her swim, what distance did she actually travel?
3. A ball is kicked at 50 deg. from the horizontal at a velocity of 10 m/s. If the wind is blowing at 5 m/s at 10 deg. from the horizontal, how fast and in what direction will the ball be traveling?
Homework Answers
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1. A swimmer is attempting to cross the James River. She enters
the water and begins...
A swimmer wants to cross a river, from point A to point B, as shown in...
A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 180 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity relative to the water makes an angle of 45 degrees with the line from A to C, as indicated in the figure. To swim directly...
1) . A passenger on a moving train walks at a speed of 1.90 m/s due...
1) . A passenger on a moving train walks at a speed of 1.90 m/s due north relative to the train. The passenger's speed with respect to the ground is 4.5 m/s at an angle of 31.0° west of north. What are the magnitude and direction of the velocity of the train relative to the ground? 2) A ship sets sail from Rotterdam, The Netherlands, heading due north at 8.00 m/s relative to the water. The local ocean current is...
1) A daring 51 kg swimmer dives off a cliff with a running horizontal leap. A)What...
1) A daring 51 kg swimmer dives off a cliff with a running horizontal leap. A)What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is L = 2.40 m wide and h = 9.40 m below the top of the cliff? 2)A physics book slides off a horizontal tabletop with a speed of 3.40 m/s. It strikes the floor in 0.400 s. Ignore...
Part 2 (Choose 3 Nom TUTT I 1. A race car starts from rest and travels...
Part 2 (Choose 3 Nom TUTT I 1. A race car starts from rest and travels 400 meters in 5.2 seconds. When it crosses the finish line it has a final velocity of 140 m/s. a) What is the acceleration (a) of this car? b) How much time was spent traveling from 100 m/s to 140 m/s? c) If this car continued at this rate of acceleration, how long would it take for it to travel 800 meters? 2. A...
Kinematic equations: v,'-v,+αΔΙ 1. The Rogue River in Oregon is so rocky in spots that jet...
Kinematic equations: v,'-v,+αΔΙ 1. The Rogue River in Oregon is so rocky in spots that jet boats become a popular way for tourists to see wild stretches of the river. A system of air jets thrusting downward keep the boat suspended above the water and a second system of air jets move it horizontally. A jet boat driver comes around a bent in the river moving due west at a speed of 12 m/s when she discovers that a large...
Class worksheet: Kinematics in One Dimension Kinematic equations: Va, A 2 1. The Rogue River in...
Class worksheet: Kinematics in One Dimension Kinematic equations: Va, A 2 1. The Rogue River in Oregon is so rocky in spots that jet boats become a popular way for tourists to see wild stretches of the river. A system of air jets thrusting downward keep the boat suspended above the water and a second system of air jets move it horizontally. A jet boat driver comes around a bent in the river moving due west at a speed of...
1. A soccer player can kick a ball with maximum initial speed 10 m/s. She kicked...
1. A soccer player can kick a ball with maximum initial speed 10 m/s. She kicked the ball at different angles to check how the horizontal distance to the point the ball hits the ground changes with the angle the ball is kicked. Calculate the horizontal distance for different angles and draw a graph of the horizontal distance versus the angle θ with the ground. What is the angle at which the distance is maximum? Can you explain why there...
Problem 1: A car of mass 1000 kg moves at a constant speed of 20 m/s...
Problem 1: A car of mass 1000 kg moves at a constant speed of 20 m/s along a horizontal road where a frictional force is 200N. Calculate the power developed by the engine. If the car now moves up an incline at the same constant speed, calculate the new power developed by the engine. Assume that the frictional force is still 200 N and that sin(theta)=1/20 where theta is the angle of the incline to the horizontal. Problem 2: An...
A bridge is supported by two types of rectangular cross-section piles located in a river as shown in Figure 1. The widt...
A bridge is supported by two types of rectangular cross-section piles located in a river as shown in Figure 1. The width of the piles is w - 0.5 m and their lengths are either l 2 m or 12 2.5 m. The river of depth of about 20 m runs at 2 m/s. Water density is p 1000 kg/m and its absolute viscosity 1.00 x 10-3 N.s/m2 You are asked to perform dimensional analysis to find the drag force...
A bridge is supported by two types of rectangular cross-section piles located in a river as shown in Figure 1. The wid...
A bridge is supported by two types of rectangular cross-section piles located in a river as shown in Figure 1. The width of the piles is w -0.5 m and their lengths are either lı- 2 m or l2-2.5 m. The river of depth of about 20 m runs at 2 m/s. Water density is p 1000 kg/m3 and its absolute viscosityH 1.00 x 10-3 N.s/m2. You are asked to perform dimensional analysis to find the drag force on the...
Part 2 (Choose 3 Nom TUTT I 1. A race car starts from rest and travels 400 meters in 5.2 seconds. When it crosses the finish line it has a final velocity of 140 m/s. a) What is the acceleration (a) of this car? b) How much time was spent traveling from 100 m/s to 140 m/s? c) If this car continued at this rate of acceleration, how long would it take for it to travel 800 meters? 2. A...
Kinematic equations: v,'-v,+αΔΙ 1. The Rogue River in Oregon is so rocky in spots that jet boats become a popular way for tourists to see wild stretches of the river. A system of air jets thrusting downward keep the boat suspended above the water and a second system of air jets move it horizontally. A jet boat driver comes around a bent in the river moving due west at a speed of 12 m/s when she discovers that a large...
Class worksheet: Kinematics in One Dimension Kinematic equations: Va, A 2 1. The Rogue River in Oregon is so rocky in spots that jet boats become a popular way for tourists to see wild stretches of the river. A system of air jets thrusting downward keep the boat suspended above the water and a second system of air jets move it horizontally. A jet boat driver comes around a bent in the river moving due west at a speed of...
Problem 1: A car of mass 1000 kg moves at a constant speed of 20 m/s along a horizontal road where a frictional force is 200N. Calculate the power developed by the engine. If the car now moves up an incline at the same constant speed, calculate the new power developed by the engine. Assume that the frictional force is still 200 N and that sin(theta)=1/20 where theta is the angle of the incline to the horizontal. Problem 2: An...
A bridge is supported by two types of rectangular cross-section piles located in a river as shown in Figure 1. The width of the piles is w - 0.5 m and their lengths are either l 2 m or 12 2.5 m. The river of depth of about 20 m runs at 2 m/s. Water density is p 1000 kg/m and its absolute viscosity 1.00 x 10-3 N.s/m2 You are asked to perform dimensional analysis to find the drag force...
A bridge is supported by two types of rectangular cross-section piles located in a river as shown in Figure 1. The width of the piles is w -0.5 m and their lengths are either lı- 2 m or l2-2.5 m. The river of depth of about 20 m runs at 2 m/s. Water density is p 1000 kg/m3 and its absolute viscosityH 1.00 x 10-3 N.s/m2. You are asked to perform dimensional analysis to find the drag force on the...
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