An Olympic athlete throws a javelin at four different angles above the horizontal, each with the same speed: 30 degrees, 40 degrees, 60 degrees, and 80 degrees. Which two throws cause the javelin to land the same distance away? A 30 degrees and 80 degrees B 40 degrees and 60 degrees 40 degrees and 80 degrees 30 degrees and 60 degrees
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- A baseball is hit at an angle 0 and travels along a parabolic arc before it strikes the ground. Which one of the following statements is true? O The acceleration of the ball decreases as the ball moves upward. O The velocity of the ball is O when the ball is at the highest point in the arc. O The acceleration of the ball is 0 when the ball is at the highest point in the arc. O The velocity of the ball is a maximum when the ball is at the highest point in the arc. O None of the above.A bee flies east at a speed of 1.00 m/s relative to air. The wind has a speed of 5.0 km/hr with respect to Earth in the direction 25° west of south. How long will it take the bee to cross a field that is 500m wide? 18 min 16 min 6.3 min 20 min The bee can not cross the field.A circus performer throws a knife at a bound stagehand who is tied to a post. The knife is thrown at an angle of 17.8° below the horizontal with an initial speed of 3.11 m/s. The knife hits the post between the stagehand's feet, a distance of 0.63 m vertically below where it was released. How far from the post was the performer when she threw the knife? Select one: a. 0.81 m cross out b. 0.38 m cross out c. 0.17 m cross out d. 0.77 m cross out e. 0.65 m cross out Your answer is incorrect. The correct answer is: 0.81 m
- A woman stands at the edge of a cliff and throws a pebble horizontally over the edge with a speed of v0 = 20.5 m/s.The pebble leaves her hand at a height of h = 55.0 m above level ground at the bottom of the cliff, as shown in the figure. Note the coordinate system in the figure, where the origin is at the bottom of the cliff, directly below where the pebble leaves the hand. Answer parts a-f.Question 013A: Complete the following question involving vectors and net force. A boat travels towards the northeast at 23 knots, and there is an 8 knot crosswind out of the southeast affecting the boat. Convert the boat's motion (not the crosswind) into rectangular coordinates (aka: convert into "X" and "y"). O x = -16.26 y = -16.26 O x = 16.26 y = 16.26 O x = 0 y = 23 x = 16.26 y = -16.26 QUESTION 14 Question 013B: Complete the following question involving vectors and net force. A boat travels towards the northeast at 23 knots, and there is an 8 knot crosswind out of the southeast affecting the boat. Convert the crosswind (not the boat) into rectangular coordinates (aka: convert into "x" and "y"). O x = 5.66 y = -5.66 O x = -4 y = 4 O x = -5.66 у--5.66 O x = -5.66 y = 5.663. Penny drops a leaf into the water which runs east downstream. She measures the distance the leaf travels as 3.0 meters in 9.0 seconds. Penny then swims across the river, orienting herself perpendicular to the water, and lets the river current carry her downstream. She swims across the 57 m wide river in 47 seconds. a. Sketch the overall vectors of the velocities of the person to the water, the water to the ground and the person to the ground. Write the equation for the velocity of the person relative to the ground with the appropriate subscripts b. Determine the velocity of the water in the river relative to the ground. c. How far downstream will Olaf drift?" d. Determine the velocity of the person relative to the water (with direction) e. Determine the velocity of the person relative to the ground (with direction).
- A throws the ball with an initial velocity V0 = 90 km / hr at an angle α with the horizontal. If the ball goes through B, Determine a) the angle α and b) the angle θ that the vector VB makes with the horizontal.What is the magnitude of the two vetors: A: 4.00 i + 7.00 j and B: 5.00 i - 2.00 j ? What is the expression for A-B? What is the magnitude and direction of A-B? Vector diagram show A, b and A-B, and agrees with the the previous question?A boy decides to propose to his girlfriend in a hot air balloon. They are in the balloon, and it is moving 15 degrees south of east at a velocity 10 m/s relative to the air. When the balloon has a height of 90 m the boy is about to propose to but he drops the ring. The wind is also blowing to the east at 12 m/s relative to the ground. They now need to find the ring. a) What is the horizontal distance ( magnitude and direction) the ring lands on the ground from where it drops out of the balloon? b) What is the final velocity of the ring right before it hits the ground? c) Draw the vertical position vs time graph, velocity vs time graph, and acceleration vs time graph of the ring.