Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN: 9781337553292
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Textbook Question
Chapter 5, Problem 2P
One or more external forces, large enough to be easily measured, are exerted on each object enclosed in a dashed box shown in Figure 5.1. Identify the reaction to each of these forces.
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Two blocks of masses m and m2 (m1 > m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m, in the figure below.
F
(a) If P is the magnitude of the contact force between the blocks, draw the free-body diagrams for each block. (Do this on paper. Your instructor may ask you to turn in this work.)
(b) What is the net force on the system on the system consisting of both blocks? (Use the following as necessary: P and F.)
Fnet
(c) What is the net force acting on m1? (Use the following as necessary: P and F.)
Fnet,1 =
(d) What is the net force acting on m2? (Use the following as necessary: P and F.)
Fnet,2 =
(e) Write the x-component of Newton's second law for each block. (Do this on paper. Your instructor may ask you to turn in this work.)
(f) Solve the resulting system of two equations and two unknowns, expressing the acceleration a and contact force P in terms of the masses and force. (Use the following as…
For items 5-6, refer to the scenario below:
In a classroom demonstration, a 79.2-kg physics professor lies on a "bed of nails." The
bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board
so that the points extend vertically outward from the board. While the professor is lying
down, approximately 1950 nails make contact with his body.
7. What is the average force exerted by each nail on the professor's body?
A) 0.201 N
B) 0.398 N
C) 1.42 N
D) 0.809 N
E) 142 N
8. If the area of contact at the head of each nail is 1.26 x 10-6 m², what is the
average pressure at each contact?
A) 1.58 x 105 Pa
B) 1.27 x 106 Pa
C) 2.40 x 104 Pa
D) 4.82 x 104 Pa
E) 3.16 x 105 Pa
Calculate the magnitude of the normal force on a 17.7 kg block in the following circumstances. (Enter your answers in N.)
The block is on a level surface and a force of 165 N is exerted on it at an angle of 40.8° above the horizontal.
I don't know how to do this.
Chapter 5 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 5.2 - Which of the following statements is correct? (a)...Ch. 5.4 - An object experiences no acceleration. Which of...Ch. 5.4 - You push an object, initially at rest, across a...Ch. 5.5 - Suppose you are talking by interplanetary...Ch. 5.6 - (i) If a fly collides with the windshield of a...Ch. 5.8 - You press your physics textbook flat against a...Ch. 5.8 - Prob. 5.7QQCh. 5 - A certain orthodontist uses a wire brace to align...Ch. 5 - One or more external forces, large enough to be...Ch. 5 - A 3.00-kg object undergoes an acceleration given...
Ch. 5 - The average speed of a nitrogen molecule in air is...Ch. 5 - Two forces, F1=(6.00i4.00j)N and...Ch. 5 - Prob. 6PCh. 5 - Review. Three forces acting on an object are given...Ch. 5 - Prob. 8PCh. 5 - Review. The gravitational force exerted on a...Ch. 5 - Review. The gravitational force exerted on a...Ch. 5 - Review. An electron of mass 9. 11 1031 kg has an...Ch. 5 - If a man weighs 900 N on the Earth, what would he...Ch. 5 - You stand on the seat of a chair and then hop off....Ch. 5 - A brick of mass M has been placed on a rubber...Ch. 5 - Review. Figure P5.15 shows a worker poling a boata...Ch. 5 - An iron bolt of mass 65.0 g hangs from a string...Ch. 5 - A block slides down a frictionless plane having an...Ch. 5 - A bag of cement whose weight is Fg hangs in...Ch. 5 - The distance between two telephone poles is 50.0...Ch. 5 - An object of mass m = 1.00 kg is observed to have...Ch. 5 - Prob. 21PCh. 5 - An object of mass m1 = 5.00 kg placed on a...Ch. 5 - In the system shown in Figure P5.23, a horizontal...Ch. 5 - A car is stuck in the mud. A tow truck pulls on...Ch. 5 - An object of mass m1 hangs from a string that...Ch. 5 - Why is the following situation impassible? Your...Ch. 5 - Consider a large truck carrying a heavy load, such...Ch. 5 - Before 1960m people believed that the maximum...Ch. 5 - A 9.00-kg hanging object is connected by a light,...Ch. 5 - The person in Figure P5.30 weighs 170 lb. As seen...Ch. 5 - Three objects are connected on a table as shown in...Ch. 5 - You are working as a letter sorter in a U.S Post...Ch. 5 - You have been called as an expert witness for a...Ch. 5 - A block of mass 3.00 kg is pushed up against a...Ch. 5 - Prob. 35PCh. 5 - A 5.00-kg block is placed on top of a 10.0-kg...Ch. 5 - A black aluminum glider floats on a film of air...Ch. 5 - Why is the following situation impossible? A book...Ch. 5 - Two blocks of masses m1 and m2, are placed on a...Ch. 5 - A 1.00-kg glider on a horizontal air track is...Ch. 5 - An inventive child named Nick wants to reach an...Ch. 5 - Prob. 42APCh. 5 - Prob. 43APCh. 5 - Prob. 44APCh. 5 - A crate of weight Fg is pushed by a force P on a...Ch. 5 - In Figure P5.46, the pulleys and pulleys the cord...Ch. 5 - You are working as an expert witness for the...Ch. 5 - A flat cushion of mass m is released from rest at...Ch. 5 - What horizontal force must be applied to a large...Ch. 5 - Prob. 50APCh. 5 - A block of mass 2.20 kg is accelerated across a...Ch. 5 - Prob. 52CPCh. 5 - Initially, the system of objects shown in Figure...Ch. 5 - Prob. 54CPCh. 5 - In Figure P5.55, the incline has mass M and is...
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- Blocks A and B of mass 14 kg and 8 kg respectively, are placed on the inclined plane and released. The coefficients of kinetic friction between the blocks and the inclined plane are μA = 0.2 and μB = 0.3. Neglect the mass of the link. (Figure 1) Figure A B 30° 1 of 1 Part A Determine the magnitude of the force developed in the link. Express your answer to three significant figures and include the appropriate units. F = Submit μA Value Provide Feedback Request Answer Units B) ?arrow_forwardThree forces of magnitudes F1=4.0N, F2=6.0N, and F3=8.0N are applied to a block of mass m=2.0kg, initially at rest, at angles shown on the diagram. (Figure 1) In this problem, you will determine the resultant (net) force by combining the three individual force vectors. All angles should be measured counterclockwise from the positive x axis (i.e., all angles are positive). How far (in meters) will the block move in 5.0 s? Recall that it starts from rest.arrow_forwardThree forces of magnitudes F1=4.0N, F2=6.0N, and F3=8.0N are applied to a block of mass m=2.0kg, initially at rest, at angles shown on the diagram. (Figure 1)In this problem, you will determine the resultant (net) force by combining the three individual force vectors. All angles should be measured counterclockwise from the positive x axis (i.e., all angles are positive). A.) What is the magnitude of the block's acceleration vector, a⃗ ? B.) What is the direction of a⃗ ? In other words, what angle does this vector make with respect to the positive x axis? C.) How far (in meters) will the block move in 5.0 s? Recall that it starts from rest.arrow_forward
- Two blocks, each of mass m = 2.1kg are pushed along the horizontal surface of a table by a horizontal force P of magnitude 7.1 N directed to the right, as shown in the figure below. The blocks move together to the right at constant velocity? Find the frictional force exertered on the lower block by the table ? Find the coefficient of kinetic friction between the surface of the block and the table? Find the frictional force acting on the upper block?arrow_forwardDraw a free-body diagram for block A. The figure shows a block (mass ma) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block (mass mB), which hangs vertically. Ignore friction and the masses of the pulley and cord. (Figure 1) Draw the vectors starting at the black dots. The location and orientation of the vectors will be graded. The exact length of your vectors will not be graded. No elements selected Select the elements from the list and add them to the canvas setting the appropriate attributes. Submit Request Answer Figure 1 of 1 Part B Draw a free-body diagram for block B. MA Draw the vectors starting at the black dots. The location and orientation of the vectors will be graded. The exact length of your vectors will not be graded. MB No elements selectedarrow_forwardAs shown in (Figure 1), block AA (mass 2.10 kgkg) rests on a tabletop. It is connected by a horizontal cord passing over a light, frictionless pulley to a hanging block BB (mass 1.28 kgkg). The coefficient of kinetic friction between block AA and the tabletop is 0.353. The blocks are released then from rest. Find the speed of each block after moving 3.20 cm. Find the tension in the cord.arrow_forward
- Let's consider the system given in Figure 2. The end of a flexible spring with spring constant k is attached to the wall and the other end to a block of mass m. There is no friction between the block and the inclined plane. When the spring is at its natural length, the block is first decelerated. The angle of inclination of the inclined plane is given as ß. b) What will be the velocity (velocity component) of the block when the spring is extended by x?arrow_forwardA particle, which remains at rest, is acted on by three forces, P, Q and R, and no others, as shown in the diagram attached. The force P acts horizontally to the left, the force Q acts vertically upwards and the force R acts downwards and to the right at an angle of 30◦ to the horizontal. The magnitude of P is 52 N. Let the magnitudes of Q and R in newtons be Q and R respectively. Take the Cartesian unit vectors i and j to be in the opposite direction to P and in the same direction as Q, respectively. a) Find expressions for the component forms of the three forces P, Q and R. b) Hence or otherwise find Q to two significant figures.arrow_forwardA7. Consider a spring-mass system as shown in the diagram, which consists of 1.0 kg block held by three identical springs with force constant k = 100 Nm', as shown in Fig. A7. Fig. A7 (a) Consider the block being displaced by a distance x m to the left. Determine the net force (both magnitude and direction) acting on the block by the springs. (b) The block is then released from rest. Show that the block performs simple harmonic motion, and determine the frequency of oscillation.arrow_forward
- Let's consider the system given in Figure 2. The end of a flexible spring with spring constant k is attached to the wall and the other end to a block of mass m. There is no friction between the block and the inclined plane. When the spring is at its natural length, the block is first decelerated. The angle of inclination of the inclined plane is given as ß. d) How long is the spring extended when the block's velocity is maximum?arrow_forwardProblem 5: An object of mass m has these three forces acting on it (there is no normal force, "no surface"). F = 3 N, F2 = 10 N, and F3 = 5 N. When answering the questions below, assume the x-direction is to the right, and they-direction is straight upwards. F, F What is the net force in component form, in terms of F1, F2, F3, and the unit vectors i and j F = 7 8 HOME a F| i j 4 5 y d. F1 1 | 2 3 F2 F3 +| - END h P vol BACKSPACE DEL CLEAR Submit Hint Feedback I give up! What is the magnitude of the net force, in newtons? What is the angle e, in degrees, of the net force, measured from the +x-axis? Enter an angle between -180° and 180°. What is the magnitude, Ja of the acceleration, in meters per square second, if the block has a mass of 8.9 kg?arrow_forwardHere we have a block of mass (m=2.50kg) resting on a place inclined at an angle of ø=30° to the horizontal. The coefficient of static friction between the block and the plane is Ustatic = 0.135 and the block is stationary but just on the point of sliding up the slope. The diagram shows the four forces acting on the block: an applied force F1 acting up the slope, the block's weight mg, the normal reaction force N and the force of static friction, Ff. In this case, the force of static friction acts down the slope, opposing the tendency of the block to move up the slope. Find the the maximum magnitude of the applied force F1 that can be exerted if the block is to remain stationary.arrow_forward
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