2000 kg car is being pushed from rest by a bulldozer. The car is pushed for 10 econds along a rough road with a coefficient of friction of 0.05. The car experiences an npulse of 10,000 kgm/s. a. What net force acts on the car? 1 of 2 b. What is the acceleration of the car? C. What is the work done by the non-conservative forces as the car moves along the road? 1:05 P 5/12/20
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- Sara used a sling shot to hunt a bird. She stretched the rubber band 5cm when she applied 2 N force. How much elastic potential energy is stored in the sling shot ? A. 0.05 J B. 0.075 J C. 0.45 J D. 0.25 JA 4.00kg block moves with an initial speed of3.50 km/h downhillover an inclined plane as shown in the figure. The height of the inclined plane is 51.3cm and the friction coefficient between the block and the incline is 0.120. a.How much is the speed of the block at the midpoint of the inclined side. b.How much is the speed of the block at the bottom of the inclined side.An arrow of mass 0.0348 kilograms is placed on a bow, and the string is drawn back 0.533 meters with an average force of 143 newtons. a. With what speed does the arrow leave the bow? b. If the arrow is shot straight up, how high does it rise? Solve using the law of conservation of energy, not a constant acceleration equation.
- A car is accelerated from velocity v1 to v2 in the time period of t . The mass of the car is m. The inclined angle of the hill is α. The distance travelled along the hill is L. The vertical distance travelled is H. Select the equation used to calculate the potential energy increase of the car ΔPE______ A. B. ΔPE=mgH C. ΔPE=mgL D.A32.) A 1000 kg boat is towed in the water by a cable in a straight line. The Tension in the cable is 3,000N. The coefficient of friction between the boat and the water is µ = 0.2. It starts from rest and reaches a final speed of 5m/s after some unknown distance. Angles must be shown in your work calculations. a.) What is the final kinetic energy of the boat? b.) Using the Work-Kinetic Energy Theorem, find the unknown distance.
- 1. A 7.50-kg box initially at rest slides down a 15.0 m long incline that makes an angle of 22.0° with the horizontal (see figure). At the bottom of the incline, the speed of the box is 3.00 m/s. a) Draw a free body diagram, detailing all of the forces acting on the box. b) Using the work done by non-conservative forces relationship, find the algebraic expression for the coefficient of kinetic friction between the box and the incline. c) Calculate the coefficient of kinetic friction.q2A horizontal carousel is rotating around its axis with constant angular velocity w. On the carousel there is a straight track passing through its middle. A cart of mass m is traveling along the track with constant velocity v relative to the carousel. Note that there is friction between the cart and the carousel. FR XR
- A box sits on the horizontal bed of a truck that is accelerating to the left, as shown in the diagram. Static friction between the box and the truck keeps the box from sliding around as the truck accelerates. The work done on the box by the static friction force as the accelerating truck moves a distance D to the left is A. Positive B. Zero C. Negative D. Dependent upon the speed of the truck1. A block is accelerated with a = 8. The initial velocity of the block is VF 2 m/s. A. If the block is accelerated for t = 3 s. Find the position of the block. B. Use the work-energy theorem to find the final velocity of the block. Where the distance d is the position you find in part (A). insan object is acted by a frictional force. the work done by this frictional force is a. negative because friction force is opposite its motion b. zero because fk = ukn and normal force is perpendicular to the motion c. zero because friction is not the cause of its motion d. could be positive, negative or zero because the direction of friction is unknown