*42. D In the javelin throw at a track-and-field event, the javelin islaunched at a speed of 29 m/s at an angle of 36° above the horizontal. Asthe javelin travels upward, its velocity points above the horizontal at anangle that decreases as time passes. How much time is required for theangle to be reduced from 36° at launch to 18°?

Rewrite expression for time using direction of the velocity tanθ=vyvx=v-gtvcosθit=v-vcosθitanθg

Answered: *42. D In the javelin throw at a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Answer part D).
A cannonball is fired with an initial velocity of 72 m/s, at an angle of 38 ° from the horizontal. a. What are the x and y components of the initial velocity of the cannonball? Vx m/s Vy = m/s b. What are the x and y components of the cannonball's velocity at the highest point of the path? Vx = m/s Vy = m/s
a
A rocket is fired at a speed of 86.0 m/s from ground level, at an angle of 31.0° above the horizontal. The rocket is fired toward an 7.92- Im high wall, which is located 16.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its engines shut down and the rocket coasts. By how much does the rocket clear the top of the wall? Number i Units
A rocket is fired at a speed of 83.0 m/s from ground level, at an angle of 45.0° above the horizontal. The rocket is fired toward an 12.5-m high wall, which is located 21.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its engines shut down and the rocket coasts. By how much does the rocket clear the top of the wall? Number i Units
PM2.1 please explain each step
A ball is kicked from the ground at an angle of Q = 51 degrees with respect to the horizontal. The ball is in the air for a time tm = 1.1 s before it lands back on the ground. a. Numerically what is the total horizontal distance dm in meters, travelled by the ball in the time tm?
An airplane flies horizontally at a height of h = 7840 m and with a speed of 720 km/h. A package is released from the plane which then hits the ground and explodes. Find the approximate time it takes for the package to reach the ground.a. 40sb. 20sc. 30sd. 10s
A particle travels along xyz – plane with an equation of motion given by v (t) = 9.20 t2 m i – 6.20 t3 m j + 4.10 t4 m k. g3 a. Determine the magnitude of the average velocity of the particle from t = 2.00 s to t – 5.00s . b. Determine the magnitude of the position vector when t = 4.00s .
A/1) In projectiles, why does a particle reach a velocity of zero? And at what height? Prove it mathematically. Assume that we have an ideal conditions of motion. Take the initial velocity of launching to be v at angle θ from the ground as shown in figure. A/2) One day, you were driving a car at a speed of 73.2 km/h and your eyes closed suddenly for a 0.4 sec. How far does the car move during that time in minutes? Note: Please answer sections A and B
A baseball player hits a ball 1.1m above the plate at an angle of 42 degrees at a speed of 35 m/s. In order to hit a home run, the ball has to clear a 2.4 m tall wall, 120 m away from the plate. a) sketch the situation, including a coordinate system and the ball's trajectory. b)how many seconds is the ball in the air, which it reaches the wall? c) does the ball go over the wall for a home run? (find its vertical position at the appropriate time) d) what is the ball's speed and direction, as it reaches the wall?
a. A football player kicks a ball at an initial velocity of 15 m/s at an angle of 30° with horizontal. Find the time of flight, range, maximum height, and velocity components at t = 0, at mid-range and at impact.

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