4.35 Two adults and a child want to push a wheeled cart in the di- rection marked x in Fig. P4.35 (next page). The two adults push with horizontal forces F₁ and F2 as shown. (a) Find the magnitude and direc- tion of the smallest force that the child should exert. Ignore the effects of friction. (b) If the child exerts the minimum force found in part (a), the cart accelerates at 2.0 m/s² in the +x-direction. What is the weight of the cart?

4.35 Two adults and a child want to push a wheeled cart in the di- rection marked x in Fig. P4.35 (next page). The two adults push with horizontal forces F₁ and F2 as shown. (a) Find the magnitude and direc- tion of the smallest force that the child should exert. Ignore the effects of friction. (b) If the child exerts the minimum force found in part (a), the cart accelerates at 2.0 m/s² in the +x-direction. What is the weight of the cart?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter4: The Laws Of Motion

Section: Chapter Questions

Problem 8P: A 3.00-kg object is moving in a plane, with its x and y coordinates given by x = 5t2 1 and y = 3t3...

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Figure P4.35 F₁ = 100 N 60° 30° X F₂ = 140 N
Person A, is tired pulling Person B and his wagon . So, Person B lets Person A to sit on his wagon and takes Person’s A place in crossing a 25m-long bridge. Starting from rest, Person B pulls Person A and the sleigh with a 130-N force 30° above the horizontal against the ground's frictional force of 95N. 1. Draw an appropriate free body diagram to represent all the forces acting on Person A and the wagon. (Person A and the Wagon are considered as a single object/system.) What is the acceleration of Person A and the wagon if their combined mass is 400kg? How much work is done by Person B in crossing the bridge? What is the total work done by all the forces on Person A and the wagon over the distance of 25 m? What is the change in the kinetic energy of Person A and the Wagon after crossing the bridge?
4.4 · A man is dragging a Figure E4.4 trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0°, and the man pulls upward with a force É whose direction makes an angle of 30.0° with the ramp (Fig. E44). (a) How large a force F is necessary for the component F, parallel to the ramp to be 60.0 N? (b) How large will the component Fy perpendi- cular to the ramp then be? 30,00 20.00
On the next flower, the bee gets close to two grains of pollen located on two different stamens (Figure 4a). The bee is modelled by a point charge q4 located at point A and the grains of pollen by two charges of the same value q, respectively located at points P1 and P2 (Figures 4b and c). а) b) Веe y Вее A P. Grain of pollen Grain of Stamen pollen Pistil Stamen c) AX 9. P, P2 9, FIGURE 4 – Modelling of a bee and two grains of pollen. a) A bee gets close to the stamens of a plant. It is at equal distance of two grains of pollen located on two separate stamens. b) The bee and the grains of pollen are modelled by point charges. c) Final model.
37.00 (a) Find the tension in each cable supporting the 6.00 × 10²-N cat burglar in Figure P4.35. (b) Suppose the hori- zontal cable were reattached higher up on the wall. Would the tension in the other cables increase, decrease, or stay the same? Why? 600 N Figure P4.35
A powerful motorcycle can produce an acceleration of 3.50 m/s while traveling at 90.0 km/h. At that speed the forces resisting motion, including friction and air resistance, total 400 N. (Air resistance is analogous to air friction. It always opposes the motion of an object.) What is the magnitude of the force the motorcycle exerts backward on the ground to produce its acceleration if the mass of the motorcycle with rider is 245 kg?
The leg and cast in fig p4.40 weight 220n (w1) ,Determine the weight w2 and the angle ∝ needed so that no force is exeted on the hip joinby the leg plus the cast
Two forces, and , act on the 7.00-kg block shown in the drawing. The magnitudes of the forces are F1=68.0 N and F2=33.4 N. Take the positive direction to be to the right. Find the horizontal acceleration of the block, including sign.
When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 904 N and the drag force has a magnitude of 1003 N. The mass of the sky diver is 92.2 kg. Take upward to be the positive direction. What is his acceleration, including sign?
30. A block slides down a frictionless plane having an incli- W nation of 015.0°. The block starts from rest at the top, and the length of the incline is 2.00 m. (a) Draw a free-body diagram of the block. Find (b) the accelera- tion of the block and (c) its speed when it reaches the bottom of the incline.
Two adults and a child want to push a wheeled cart in the directionmarked x in Fig. P4.35 (next page). The two adults push with horizontalforces F S1 and F S2 as shown. (a) Find the magnitude and direction ofthe smallest force that the child should exert. Ignore the effects of friction.(b) If the child exerts the minimum force found in part (a), the cart acceleratesat 2.0 m>s2 in the +x-direction. What is the weight of the cart?
Somebody is riding a skateboard and holding a wire that is tied to a car. The wire makes a 17° angle with the horizontial. The tension on the wire is 175N. The friction between the skateboard and the road is 80N. They have a mass of 81kg. Create a free body diagram and find the acceleration.