Learning Materials
Features
Discover
Chapter 8: Q.24 (page 199)
A ball swings in a vertical circle at the end of a -long string. When the ball is at the bottom of the circle, the tension in the string is . What is the speed of the ball at that point?
The speed of the ball at that point is.
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
If a vertical cylinder of water (or any other liquid) rotates about its axis, as shown in FIGURE CP8.71, the surface forms a smooth curve. Assuming that the water rotates as a unit (i.e., all the water rotates with the same angular velocity), show that the shape of the surface is a parabola described by the equation
Hint: Each particle of water on the surface is subject to only two forces: gravity and the normal force due to the water underneath it. The normal force, as always, acts perpendicular to the surface.
A car drives around a flat -diameter circular track at . What are the magnitude and direction of the net force on the car? What causes this force?
In the absence of air resistance, a projectile that lands at the CALC elevation from which it was launched achieves maximum range when launched at a 45o angle. Suppose a projectile of mass m is launched with speed v0 into a headwind that exerts a constant, horizontal retarding force
a. Find an expression for the angle at which the range is maximum.
b. By what percentage is the maximum range of a 0.50kg ball reduced if Fwind = 0.60 N ?
A 1500 kg car starts from rest and drives around a flat 50-m-diameter circular track. The forward force provided by the car鈥檚 drive wheels is a constant 1000 N.
a. What are the magnitude and direction of the car鈥檚 acceleration at t = 10 s? Give the direction as an angle from the r-axis.
b. If the car has rubber tires and the track is concrete, at what time does the car begin to slide out of the circle?
Three cars are driving atalong the road shown in FIGURE EX8.30. Car B is at the bottom of a hill and car C is at the top. Both hills have a m radius of curvature. Suppose each car suddenly brakes hard and starts to skid. What is the tangential acceleration (i.e., the acceleration parallel to the road) of each car? Assume localid="1647757037587" .
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine