4. A cyclist is pedaling around a circular level track of radius 45m. The coefficient of static friction between the tires and track is 0.48 and the coefficient of kinetic friction is 0.45. (a) What is the maximum speed of the cyclist without the tires slipping? (b) At this speed, the cyclist suddenly brakes, locking the wheels, and slides to a halt. How far do they slide and in what direction?

A car enters a 368-m radius horizontal curve on a rainy day when the coefficient of static friction between its tires and the road is 0.52. What is the maximum speed at which the car can travel around this curve without sliding in m/s?

A 3.00x10^6 - kg ant rides the second hand of an enormous vertical wall clock. The ant smoothly sweeps a circle of radius 50.0m. What is the magnitude of the upward force felt by the ant due to the second hand when it is exactly at 6 AM?

Q. 42 : The maximum safe speed of a vehicle on a circular track is 15 km/hr. When the track becomes wet, the maximum safe speed is 10 km/hr. The ratio of coefficient of friction of the dry track to that of the wet track is. (а) 3 : 2 (c) 9 : 4 (b) 2: 3 (d) 4 : 9

7. A car is right on the verge of sliding as it speeds around a level circular track. The radius of the circular track is 21 m, and the coefficient of static friction between the car's tires and the track is 0.7, while the coefficient of kinetic friction is 0.56. What is the speed of the car?

Suppose a car rounds a curve at a constant speed of 13 m/s. The curve is a circular arc with a radius of 100 m. Ignore air friction initially.  (a) What is the magnitude and direction of the horizontal force that the road must exert on the car to keep it moving along the curve? Express this magnitude as a fraction of the car’s weight.   The magnitude of the horizontal force is _______∣F→g∣|.   The direction is  (Choose one)  Horizontal and parallel to the direction the car turns to Vertical and perpendicular to the direction the car turns to vertical and parallel to the direction the car turns to horizontal and perpendicular to the direction the car turns to (b) Now suppose that air friction is not zero, but is about half the result that you calculated for part (a). Must the force that the road exerts on the car increase in magnitude compared to the no-drag case?  (Choose )Yes or No Must it change its direction? (Choose) Yes Or No

A block of mass M slides (3) along a rough (a) inclined surface (Ja au) with a constant velocity. The inclination angle ( ) of the surface is e as shown in the adjacent figure ). The coefficient (J) of kinetic friction (H ) of the Time left 059:40 inclined surface is: A. cos (e) B. tan(0) C. sin(20) M V- Constant D. cos(0) E. sin(e) *Take g= 9.8 m/s

2. (a) A distant planet has radius 3.6 x 106 m. A 6 kg cat weighs 22 N on the surface of this planet. Calculate the mass of the planet. (b) You push a 65 kg desk horizontally and it accelerates at 1.2 m/s2. If the coefficient of kinetic friction between the desk and floor is 0.38, calculate the magnitude of the force you apply to the desk.

One of the rides at an amusement park consists of small cars that are supported by steel cables 5.00 m long and rotated in a circle at gradually increasing speed.  As the speed increases, the cars rise.  Find the speed of a car when the cable makes an angle of 35.0 degrees with the vertical.

Problem 5: A car negotiates an unbanked 85.2 m radius curve at 19.9 m/s. Calculate the minimum coeficient of friction needed to negotiate the curve. Hg = || sin() cotan() atan() cosh() cos() asin() acotan() tanh() O Degrees tan() ♫ acos() E sinh() cotanh() Radians 7 ^^^ 4 1 1 + 0 VO BACKSPACE * ∞02 - 8 9 5 63 DEL HOME END CLEAR