PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 03 Daniel Hernandez Due date Wed Feb 4 10 59 59 pm 2015 EST A river flows due east at 1 49 m s A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11 5 m s due north relative to the water What is the velocity of the boat relative to shore You are correct Your receipt no is 156 5791 If the river is 283 m wide how far downstream has the boat moved by the time it reaches the north shore Stones are thrown horizontally with the same initial velocity from the tops of two different buildings A and B The stone from building A lands 6 times as far from the base of the building as does the stone from building B What is the ratio of building A s height to building B s height A B C D E F 1 36 None of these choices 6 6 36 1 6 You are correct Your receipt no is 156 2171 You are correct Your receipt no is 156 3711 A swimmer heads directly across a river swimming at her maximum speed of 1 10 m s relative to the water She arrives at a point 56 0 m downstream from the point directly across the river 78 0 m wide What is the speed of the river current You are correct Your receipt no is 156 5672 What is the swimmer s speed relative to the shore You are correct Your receipt no is 156 5527 In what direction as an angle relative to a direct line across the river should the swimmer aim instead so that she arrives at the point directly opposite her starting point A place kicker must kick a football from a point 34 0 m 37 2 yd from the goal and the ball must clear the crossbar which is 3 05 m high When kicked the ball leaves the ground with a speed of 19 1 m s at an angle of 47 0o to the horizontal By how much does the ball clear the crossbar if in fact it does Enter positive values if the ball clears and negative values if it falls below the crossbar Incorrect Tries 8 8 What is the vertical velocity of the ball at the time it reaches the crossbar Enter positive values if it is still rising and negative values if it is falling You are correct Your receipt no is 156 9123 Incorrect Initially a particle is moving at 5 46 m s at an angle of 37 7 above the horizontal Three seconds later its velocity is 6 14 m s at an angle of 56 0 below the horizontal What was the particle s average acceleration during these 3 00 seconds in the x direction enter first and the y direction You are correct Your receipt no is 156 9351 A particle leaves the origin with an initial velocity of 4 20 m s in the x direction and moves with constant acceleration a x 3 00 m s2 and a y 3 90 m s2 How far does the particle move in the x direction before turning around You are correct Your receipt no is 156 3162 What is the particle s velocity at this time Enter the x component first followed by the y component Tries 8 8 You are in a hot air balloon yes another balloon problem rising from the ground at a constant velocity of 2 00 m s upward To celebrate the takeoff you open a bottle of champagne expelling the cork with a horizontal velocity of 5 00 m s relative to the balloon When opened the bottle is 4 00 m above the ground What is the initial speed of the cork as seen by your friend on the ground You are correct Your receipt no is 156 680 What is the initial direction of the cork as seen by your friend Give your answer as an angle relative to the horizontal You are correct Your receipt no is 156 2651 Determine the maximum height of the cork above the ground You are correct Your receipt no is 156 1510 You are correct Your receipt no is 156 2260 PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 03 Daniel Hernandez How long does the cork remain in the air You are correct Your receipt no is 156 4283 Printed from LON CAPA MSU Licensed under GNU General Public License
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