wheelbarrow is experiencing two forces. One is pushing 5N to the east and the other 5N in exactly the opposite direction. What must be true of the wheelbarrow’s motion? A. Its speed is constant. B. It is accelerating. C. It is slowing down. D. It isn’t moving.

In the image is a stopper attached to a fishing line that is threaded theough a glass rod. Hanging from the end of the line opposite the stopper is a 100-gram mass. The stopper is being whirled in a horizontal circle, first quickly, then decreasing to a slower speed. a. Is the string pulling inward on the stopper? b. Is there a force pulling the stopper outward? c. True or false: The inward force and outward forces balance, and since the speed is constant, there's no acceleration and there is equilibrium.

13. An object sits at rest on a ramp. As the angle of inclination of the ramp increases, the object suddenly begins to slide. Which of the following explanations best accounts for the object's movement? a. The coefficient of static friction has decreased sufficiently. b. The force of gravity acting on the object has increased sufficiently. c. The component of gravity along the ramp has increased sufficiently. d. The friction has decreased sufficiently while the normal force has remained unchanged. e. The normal force has increased sufficiently.

As an engineer, you want to design a banked curve on a freeway off-ramp. What should the angle you pick accomplish? A. A car moving faster than the posted speed could make the turn with some friction B. A car moving at the posted speed could make the turn even if the road is icy (no friction) C. A car would feel no acceleration as it made the turn D. A car would need to move slower than the posted speed to make the turn in all weather conditions.

3. A car of mass m is traveling along a circular track of radius r with a constant speed v. Determine the minimum coefficient of static friction between the tires and the track required for the car to remain in circular motion if: a. the track is flat. b. the track has an angle

How much inertia would a 50 kg mother have compared to her 25 kg child?a. The mother has twice as much as inertia as her childb. The mother has half as much as inertia as her childc. The child has as much as inertia as her mother and herself put togetherd. The mother and child have equal inertia

At what maximum speed can a car exit onto a 40-m-radius circular freeway ramp without sliding if the coefficient of static friction between the tires of the car and the road is 0.90?    a. 18.8 m/s   b. 11.4 m/s   c. 15.3 m/s   d. 22.0 m/s   e. 13.2 m/s

a The deflection of the needle would decrease.  b The deflection of the needle would increase.  c The needle would return to its rest position.  d The needle would deflect in the opposite direction.

Two masses m₁ = 7.1 kg and m2 = 3.6 kg are connected by a string as shown. If the pulley is massless and the surface is frictionless, the magnitude of the tension in the string is A. 11.4 N OB. 11.9 N OC. 23.4 N OD. 46.2 N E. 69.6 N m₁ m₂

10. A 260-g ball is tied to a string and it is being swung faster and faster in a nearly horizontal circle. When the speed reaches 16.5 m/s the tension reaches a value of 60.0 N, the string breaks. What is the radius of the circle? cm