DATA In a physics lab experiment, you release a small steel ball at various heights above the ground and measure the ball’s speed just before it strikes the ground. You plot your data on a graph that has the release height (in meters) on the vertical axis and the square of the final speed (in m 2 /s 2 ) on the horizontal axis. In this graph your data points lie close to a straight line, (a) Using g = 9.80 m/s 2 and ignoring the effect of air resistance, what is the numerical value of the slope of this straight line? (Include the correct units.) The presence of air resistance reduces the magnitude of the downward acceleration, and the effect of air resistance increases as the speed of the object increases. You repeat the experiment, but this time with a tennis ball as the object being dropped. Air resistance now has a noticeable effect on the data, (b) Is the final speed for a given release height higher than, lower than, or the same as when you ignored air resistance? (c) Is the graph of the release height versus the square of the final speed still a straight line? Sketch the qualitative shape of the graph when air resistance is present.
DATA In a physics lab experiment, you release a small steel ball at various heights above the ground and measure the ball’s speed just before it strikes the ground. You plot your data on a graph that has the release height (in meters) on the vertical axis and the square of the final speed (in m 2 /s 2 ) on the horizontal axis. In this graph your data points lie close to a straight line, (a) Using g = 9.80 m/s 2 and ignoring the effect of air resistance, what is the numerical value of the slope of this straight line? (Include the correct units.) The presence of air resistance reduces the magnitude of the downward acceleration, and the effect of air resistance increases as the speed of the object increases. You repeat the experiment, but this time with a tennis ball as the object being dropped. Air resistance now has a noticeable effect on the data, (b) Is the final speed for a given release height higher than, lower than, or the same as when you ignored air resistance? (c) Is the graph of the release height versus the square of the final speed still a straight line? Sketch the qualitative shape of the graph when air resistance is present.
DATA In a physics lab experiment, you release a small steel ball at various heights above the ground and measure the ball’s speed just before it strikes the ground. You plot your data on a graph that has the release height (in meters) on the vertical axis and the square of the final speed (in m2/s2) on the horizontal axis. In this graph your data points lie close to a straight line, (a) Using g = 9.80 m/s2 and ignoring the effect of air resistance, what is the numerical value of the slope of this straight line? (Include the correct units.) The presence of air resistance reduces the magnitude of the downward acceleration, and the effect of air resistance increases as the speed of the object increases. You repeat the experiment, but this time with a tennis ball as the object being dropped. Air resistance now has a noticeable effect on the data, (b) Is the final speed for a given release height higher than, lower than, or the same as when you ignored air resistance? (c) Is the graph of the release height versus the square of the final speed still a straight line? Sketch the qualitative shape of the graph when air resistance is present.
Your friend says you can’t use the equation Δx=v0Δt + 1/2a(Δt)2 to find the horizontal displacement of a horizontal projectile with a constant velocity because you don’t know the acceleration in the horizontal direction. Is your friend correct? Why or why not?
My friend is incorrect. If the velocity is constant, then the horizontal acceleration is zero.
My friend is incorrect. The horizontal acceleration is the same as horizontal velocity.
My friend is incorrect. The acceleration is always −9.8 m/s2.
My friend is correct. A different equation must be used to find Δx
A soccer ball is kicked from the ground at an angle of θ = 58 degrees with respect to the horizontal. The ball is in the air for a time tm = 1.6 s before it lands back on the ground.
Numerically, what is the total horizontal distance, dm in meters, traveled by the ball in the time, tm?
A golfer wants to put the ball into the final hole which lies 7.0 m away from the ball and up a slight hill. Because of the incline while the ball moves up this hill will experience a constant deceleration of 1.8 m/s^2. Which initial velocity should the golfer give the ball if they want to make it go precisely into the hole?
Please answer in m/s
Chapter 2 Solutions
University Physics with Modern Physics (14th Edition)
College Physics: A Strategic Approach (3rd Edition)
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