oft/Windows/INetCache/Content.Outlook/P8ODOQCI/Test2_summer2020%20(003).pdf E Fit to page For full or partial credit, show your work. Each problem is worth 10 points ( maximum). Make sure to have the proper units in the final answer. 1-A puck with mass 0.140 kg moving on a frictionless air puck table at 1.2 m/s strikes a second puck with mass 0.170 kg moving in the opposite direction with speed 2.0 m/s. If the collision is elastic, what are the speeds of the pucks after they collide? 2 - In a baseball practice, a player hits the ball when it is at rest. The bat exerts a force of 640 N on the ball for 8.00 ms, giving it a final velocity of 130 km/h. Using these data to find the mass of the ball. 3 - A 170-kg merry-go-round of radius 2.10 m is rotated by pulling a rope that is wrapped around its edge. What is the magnitude of the force (assume it to be constant) on the rope needed to bring the merry-go-round from rest to an angular speed of 0.400 rev/s in 3.00 s? (The moment of inertia of merry-go-round is 1/2MR²). 4 – Consider a person who is sitting on a frictionless rotating stool. The person initially has his arms outstretched and is rotating with an angular speed of 5.0 rad/s. He then pulls his arms close to his body, thus reducing his moment of inertia to 80% of the initial one. What is his final angular speed? 5 – A tank of depth 3.5 m is filled with fresh water (density=1000 kg/m³). (a) What is the pressure at the bottom of the tank? (b) If the same tank is filled with salted water instead, the pressure at the bottom increases by 6.0 x 10ʻ Pa. Find density of the salt water. 6 - An object fully immersed in water has an apparent weight of 7.0 N. Its weight in air is 28 N. Find the density of the object. (density of water is 1000 kg/m³) Id Ps Ai W
oft/Windows/INetCache/Content.Outlook/P8ODOQCI/Test2_summer2020%20(003).pdf E Fit to page For full or partial credit, show your work. Each problem is worth 10 points ( maximum). Make sure to have the proper units in the final answer. 1-A puck with mass 0.140 kg moving on a frictionless air puck table at 1.2 m/s strikes a second puck with mass 0.170 kg moving in the opposite direction with speed 2.0 m/s. If the collision is elastic, what are the speeds of the pucks after they collide? 2 - In a baseball practice, a player hits the ball when it is at rest. The bat exerts a force of 640 N on the ball for 8.00 ms, giving it a final velocity of 130 km/h. Using these data to find the mass of the ball. 3 - A 170-kg merry-go-round of radius 2.10 m is rotated by pulling a rope that is wrapped around its edge. What is the magnitude of the force (assume it to be constant) on the rope needed to bring the merry-go-round from rest to an angular speed of 0.400 rev/s in 3.00 s? (The moment of inertia of merry-go-round is 1/2MR²). 4 – Consider a person who is sitting on a frictionless rotating stool. The person initially has his arms outstretched and is rotating with an angular speed of 5.0 rad/s. He then pulls his arms close to his body, thus reducing his moment of inertia to 80% of the initial one. What is his final angular speed? 5 – A tank of depth 3.5 m is filled with fresh water (density=1000 kg/m³). (a) What is the pressure at the bottom of the tank? (b) If the same tank is filled with salted water instead, the pressure at the bottom increases by 6.0 x 10ʻ Pa. Find density of the salt water. 6 - An object fully immersed in water has an apparent weight of 7.0 N. Its weight in air is 28 N. Find the density of the object. (density of water is 1000 kg/m³) Id Ps Ai W
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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Transcribed Image Text:oft/Windows/INetCache/Content.Outlook/P8ODOQCI/Test2_summer2020%20(003).pdf
E Fit to page
For full or partial credit, show your work. Each problem is worth 10 points (
maximum). Make sure to have the proper units in the final answer.
1-A puck with mass 0.140 kg moving on a frictionless air puck table at 1.2 m/s strikes a second
puck with mass 0.170 kg moving in the opposite direction with speed 2.0 m/s. If the collision is
elastic, what are the speeds of the pucks after they collide?
2 - In a baseball practice, a player hits the ball when it is at rest. The bat exerts a force of 640 N
on the ball for 8.00 ms, giving it a final velocity of 130 km/h. Using these data to find the mass of
the ball.
3 - A 170-kg merry-go-round of radius 2.10 m is rotated by pulling a rope that is
wrapped around its edge. What is the magnitude of the force (assume it to be constant) on
the rope needed to bring the merry-go-round from rest to an angular speed of 0.400 rev/s
in 3.00 s? (The moment of inertia of merry-go-round is 1/2MR²).
4 – Consider a person who is sitting on a frictionless rotating stool. The person initially
has his arms outstretched and is rotating with an angular speed of 5.0 rad/s. He then pulls
his arms close to his body, thus reducing his moment of inertia to 80% of the initial one.
What is his final angular speed?
5 – A tank of depth 3.5 m is filled with fresh water (density=1000 kg/m³). (a) What is the
pressure at the bottom of the tank? (b) If the same tank is filled with salted water instead,
the
pressure at the bottom increases by 6.0 x 10ʻ Pa. Find density of the salt water.
6 - An object fully immersed in water has an apparent weight of 7.0 N. Its weight in air is
28 N. Find the density of the object. (density of water is 1000 kg/m³)
Id
Ps Ai
W
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