Physics Force & Laws Of Motion Level: University
Centrifugal ForceA coin placed on a turntable rotating at 36.8 rev/min will stay there if its center is placed no further than 9.8cm from the axis of rotation. What is the maximum distance the center of the coin can be placed from the axis if the turntable rotates at 45.5 rev/min?
Part:2 What is the coefficient of friction between the coin and the turntable?
Physics Force & Laws Of Motion Level: University
Centrifugal ForceA coin placed on a turntable rotating at 36.8 rev/min will stay there if its center is placed no further than 9.8cm from the axis of rotation. What is the maximum distance the center of the coin can be placed from the axis if the turntable rotates at 45.5 rev/min?
Part:2 What is the coefficient of friction between the coin and the turntable?
Physics Force & Laws Of Motion Level: University
Projectile MotionA ball player hits a home run the baseball just clears the wall 21.0m high located 130.0m from home plate. The ball is hit at an angle of 35.0 degrees to the horizontal and air resistance is negligible. Assume the ball is hit at a height of 1.0 m above the ground
(a) What is the initial speed of the ball?
(b) How much time does it take for the ball to reach the wall?
(c) Find the velocity components and the speed of the when it reaches the wall
Misc Subject Misc Topic Level: Misc Level
Physics Properties Of Matter Level: University
Moment of Inertia and conservation of MomentumCircular disks are used in automobile clutches and transmission. When a rotating disk couples to a stationary one through frictional force the energy from the rotating disk can transfer to the stationary one. (a) Is the angular speed of the coupled disks (1) greater than (2) less than or (3) the same as the angular speed of the original rotating disk? Why? (b) If the disk rotating at 800 rpm couples to a stationary disk with three times the moment of inertia what is the angular speed of the combination?
Physics Properties Of Matter Level: University
Torquem1=8.0 kg m2=3.0kg degree=30
Radius and mass of pulley are 0.10m and 0.10 kg respectively. (A) What is the acceleration of the masses? (Neglect friction and strings mass) (b) If the pulley has a constant frictional torque of 0.050 m x N when the system is in motion what is the acceleration of the masses? ( Hint: Isolate the force. The tensions in the strings are different. Why?)
Physics Properties Of Matter Level: University
TorqueIt has a picture of a painter that is standing on the board with measurements 1.5m 2.5m 1.5m painter weighs=70kg board weighs=15kg Suppose that the board were suspended from vertical ropes attached to each and instead of resting on scaffolding. If the painter stood 1.5m from one end of the board. What would the tensions in the ropes be?
Physics Properties Of Matter Level: University
FrictionA student investigating circular motion places a dime 10cm from the center of a 33 1/3-rpm record on a turntable. The record player can accelerate at 1.42 rad/s^2. The student notes that the dime slides outward 2.25s after she has switched on the turntable. (a) Whydoes the dime slide outward? (b) What is the coefficient of static friction between the dime and the record?
Physics Force & Laws Of Motion Level: University
Verticle Circular LoopA jet pilot puts an aircraft with a constant speed into a vertical circular loop. (a) Which is greater the normal force exerted on the seat by the pilot at the bottom of the loop or that at the top of the loop? why? (b) If the speed of the aircraft is 700 km/h and the radius of the circle is 2.0 km calculate the normal forces exerted on the seat by the pilot at the bottom and top of the loop? Express answer in terms of pilots weight mg.
Physics Work,Power & Energy Level: University
Time PeriodA medical centrifuge is rated at 15000rph. How long will it take the centrifuge to make one revolution?
Physics Work,Power & Energy Level: University
CollisionTwo identical cars hit each other and lock bumpers. In each of the following cases what are the speeds of the cars immediately after coupling bumpers? (a) A car moving with a speed of 90 km/h approaches a stationary car (b) two cars approach each other with speeds of 90km/h and 120 km/h respectively (c) two cars travel in the same direction with speeds of 90km/h and 120km/h respectively.
Physics Work,Power & Energy Level: University
Conservation of MomentumWhen bunting abaseball player uses the bat to change both speed and direction of the baseball (a) will the magnitude of the change in momentum of the baseball before and after the bunt be (1) greater than the magnitude of the momentum of the baseball either before or after the bunt (2) equal to the sum of the magnitude of momenta of the baseball before/ after the bunt? (b) The baseball has a mass of 0.16 kg its speeds before and after the bunt are 15m/s and 10m/s respectively and the bunt lasts 0.025s. What is the change in momentum of the baseball? (c) What is the average force on the ball by the bat?
Physics Work,Power & Energy Level: University
Onlique CollisionA 0.20 kg billiard ball traveling at a speed of 15m/s strikes the side rail of a pool table at an angle of 60 degrees. If the ball rebounds at the same speed and angle what is the change in its momentum?
Physics Rotational Mechanics Level: University
Relation of Project MotionThe tires of a car on a muddy road are 35 cm in radius and are rotating at 40 rad/s. What is the maximum distance a lump of mud can be thrown behind the tire?
Physics Rotational Mechanics Level: University
PowerA diesel engine can exert 140 N m of torque when it is turning at 250 rad/s. Find the corresponding power output.
