University Physics Volume 1
18th Edition
ISBN: 9781938168277
Author: William Moebs, Samuel J. Ling, Jeff Sanny
Publisher: OpenStax - Rice University
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Textbook Question
Chapter 2, Problem 23CQ
If the dot product of two vectors vanishes, what can you say about their directions?
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Chapter 2 Solutions
University Physics Volume 1
Ch. 2 - Check Your Understanding Two motorboats named...Ch. 2 - Check Your Understanding A cave diver enters a...Ch. 2 - Check Your understanding Using the three...Ch. 2 - Check your Understanding A blue fly lands on a...Ch. 2 - Check Your Understanding If the displacement...Ch. 2 - Check Your Understanding If Trooper runs 20 m west...Ch. 2 - Check Your Understanding If the average velocity...Ch. 2 - Check Your understanding Three displacement...Ch. 2 - Check Your Understanding Suppose that Balto in...Ch. 2 - Check Your Understanding Verify that vector v V...
Ch. 2 - Check Your Understanding For the vectors given in...Ch. 2 - Check Your Understanding For vector in a...Ch. 2 - Check Your Understanding Find the angle between...Ch. 2 - Check Your Understanding How much work is done by...Ch. 2 - Check Your Understanding For the vectors given in...Ch. 2 - Check Your Understanding Given two vectors and ,...Ch. 2 - Scalars and Vectors A weather forecast states the...Ch. 2 - Which of the following is a vector a person’s...Ch. 2 - Give a specific example of a vector, stating its...Ch. 2 - What do vectors and scalars have in common? How do...Ch. 2 - Suppose you add two vectors A and B . What...Ch. 2 - Is it possible to add a scalar quantity to a...Ch. 2 - Is it possible for two vectors of different...Ch. 2 - Does the odometer in an automobile indicate a...Ch. 2 - When a 10,000-rn runner competing on a 400-rn...Ch. 2 - A vector has zero magnitude. Is it necessary to...Ch. 2 - Can a magnitude of a vector be negative?Ch. 2 - Can the magnitude of a particle’s displacement be...Ch. 2 - If two vectors are equal, what can you say about...Ch. 2 - If three vectors sum up to zero, si1at geometric...Ch. 2 - Give an example of a nonzero vector that has a...Ch. 2 - Explain why a vector cannot have a component...Ch. 2 - If two vectors are equal, what can you say about...Ch. 2 - If vectors A and B are orthogonal, what is the...Ch. 2 - If one of the two components of a vector is not...Ch. 2 - If two vectors have the same magnitude, do their...Ch. 2 - What is wrong with the following expressions? How...Ch. 2 - If the cross product of two vectors vanishes, what...Ch. 2 - If the dot product of two vectors vanishes, what...Ch. 2 - What is the dot product of a vector with the cross...Ch. 2 - A scuba diver makes a slow descent into the depths...Ch. 2 - In a tug-of-war game on one campus, 15 students...Ch. 2 - Suppose you walk 18.0 m straight west and then...Ch. 2 - For the vectors given in the following figure, use...Ch. 2 - A delivery man starts at the post office, chives...Ch. 2 - An adventurous dog strays from home, runs three...Ch. 2 - In an attempt to escape a desert island, a...Ch. 2 - A small plane flies 40.0 km in a direction 60...Ch. 2 - A trapper walks a 5.0-km straigt4ine distance from...Ch. 2 - A surveyor measures the distance across a river...Ch. 2 - A pedestrian walks 6.0 km east and then 13.0 km...Ch. 2 - The magnitudes of two displacement vectors are...Ch. 2 - Assuming the +x -axis is horizontal and points to...Ch. 2 - Suppose you walk 18.0 m straight west and then...Ch. 2 - You drive 7.50 km in a straight line in a...Ch. 2 - A sledge is being pulled by two horses on a flat...Ch. 2 - A trapper walks a 5.0-lan straight-line distance...Ch. 2 - The polar coordinates of a point are 4/3and 5.50...Ch. 2 - Two points in a plane have polar coordinates...Ch. 2 - A chameleon is resting quietly on a lanai screen,...Ch. 2 - Two points in the Cartesian plane are...Ch. 2 - A fly enters through an open window and zooms...Ch. 2 - For vectors and , calculate (a) and its magnitude...Ch. 2 - A particle undergoes three consecutive...Ch. 2 - Given two displacement vectors...Ch. 2 - A small plane flies 40.0 km ma direction 60 north...Ch. 2 - In an attempt to escape a desert island, a...Ch. 2 - Assuming the +x -axis is horizontal to the right...Ch. 2 - Given the vectors in the preceding figure, find...Ch. 2 - A delivery man starts at the post office, drives...Ch. 2 - An adventurous dog strays from home, runs three...Ch. 2 - If , and , find the unknown constants a and b such...Ch. 2 - Given the displacement vector , find the...Ch. 2 - Find the unit vector of direction for the...Ch. 2 - At one point in space, the direction of the...Ch. 2 - A barge is pulled by the two tugboats shown in the...Ch. 2 - In the control tower at a regional airport, an air...Ch. 2 - Assuming the axis is horizontal to the right for...Ch. 2 - Assuming the +x-axis is horizontal to the right...Ch. 2 - Find the angle between vectors for (a)...Ch. 2 - Find the angles that vector makes with the and...Ch. 2 - Show that the force vector is orthogonal to the...Ch. 2 - Assuming the +x-axis is horizontal to the right...Ch. 2 - Find the cross product for (a) and (b) and (c) and...Ch. 2 - For the vectors in the earlier figure, find (a)...Ch. 2 - (a) If AF=BF , can we conclude A=B ? (b) If AF=BF...Ch. 2 - You fly 32.0 km in a straight line in still air in...Ch. 2 - Rectangular coordinates of a point are given by...Ch. 2 - If the polar coordinates of a point are (r,)and...Ch. 2 - Prob. 74APCh. 2 - Starting at the island of Moi in an unknown...Ch. 2 - An air traffic controller notices two signals from...Ch. 2 - Show that when A+B=C then A2+B2+2ABcos , where is...Ch. 2 - Four force vectors each have the same magnitude...Ch. 2 - A skater glides along a circular path of radius...Ch. 2 - A stubborn dog is being walked on a leash by its...Ch. 2 - If the velocity vector of a polar bear is u=(-18.0...Ch. 2 - Find the scalar components of three-dimensional...Ch. 2 - A diver explores a shallow reef off the coast of...Ch. 2 - A force vector A has x and y components,...Ch. 2 - Vectors A and B are two orthogonal vectors in the...Ch. 2 - For the three-dimensional vectors in the following...Ch. 2 - Show that (BC)A is the volume of the...Ch. 2 - Vector B is 5.0 cm long and vector A is 4.0 cm...Ch. 2 - What is the component of the force vector G=(3.0...Ch. 2 - The following figure shows a triangle formed by...Ch. 2 - between points in a plane do not change when a...
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- Answer the preceding problem using polar coordinates.arrow_forwardA particle moves along a curved path y(x)=(10m){1+cos[0.1m1]x} , from x=0 to x=10m , subject to a tangential force of variable magnitude F(x)=(10N)sin[(0.1m-1)x] . How much work does the force do? (Hint: Consult a table of integrals or use a numerical integration program.)arrow_forwardA nonconstant force is exerted on a particle as it moves in the positive direction along the x axis. Figure P9.26 shows a graph of this force Fx versus the particles position x. Find the work done by this force on the particle as the particle moves as follows. a. From xi = 0 to xf = 10.0 m b. From xi = 10.0 to xf = 20.0 m c. From xi = 0 to xf = 20.0 m FIGURE P9.26 Problems 26 and 27.arrow_forward
- Which of the following statements is true about the relationship between the dot product of two vectors and the product of the magnitudes of the vectors? (a) AB is larger than AB. (b) AB is smaller than AB. (c) AB could be larger or smaller than AB, depending on the angle between the vectors. (d) AB could be equal to AB.arrow_forwardA particle moves in the xy plane (Fig. P9.30) from the origin to a point having coordinates x = 7.00 m and y = 4.00 m under the influence of a force given by F=3y2+x. a. What is the work done on the particle by the force F if it moves along path 1 (shown in red)? b. What is the work done on the particle by the force F if it moves along path 2 (shown in blue)? c. What is the work done on the particle by the force F if it moves along path 3 (shown in green)? d. Is the force F conservative or nonconservative? Explain. FIGURE P9.30 In each case, the work is found using the integral of Fdr along the path (Equation 9.21). W=rtrfFdr=rtrf(Fxdx+Fydy+Fzdz) (a) The work done along path 1, we first need to integrate along dr=dxi from (0,0) to (7,0) and then along dr=dyj from (7,0) to (7,4): W1=x=0;y=0x=7;y=0(3y2i+xj)(dxi)+x=7;y=0x=7;y=4(3y2i+xj)(dyj) Performing the dot products, we get W1=x=0;y=0x=7;y=03y2dx+x=7;y=0x=7;y=4xdy Along the first part of this path, y = 0 therefore the first integral equals zero. For the second integral, x is constant and can be pulled out of the integral, and we can evaluate dy. W1=0+x=7;y=0x=7;y=4xdy=xy|x=7;y=0x=7;y=4=28J (b) The work done along path 2 is along dr=dyj from (0,0) to (0,4) and then along dr=dxi from (0,4) to (7,4): W2=x=0;y=0x=0;y=4(3y2i+xj)(dyj)+x=0;y=4x=7;y=4(3y2i+xj)(dyi) Performing the dot product, we get: W2=x=0;y=0x=0;y=4xdy+x=0;y=4x=7;y=43y2dx Along the first part of this path, x = 0. Therefore, the first integral equals zero. For the second integral, y is constant and can be pulled out of the integral, and we can evaluate dx. W2=0+3y2x|x=0;y=4x=7;y=4=336J (c) To find the work along the third path, we first write the expression for the work integral. W=rtrfFdr=rtrf(Fxdx+Fydy+Fzdz)W=rtrf(3y2dx+xdy)(1) At first glance, this appears quite simple, but we cant integrate xdy=xy like we might have above because the value of x changes as we vary y (i.e., x is a function of y.) [In parts (a) and (b), on a straight horizontal or vertical line, only x or y changes]. One approach is to parameterize both x and y as a function of another variable, say t, and write each integral in terms of only x or y. Constraining dr to be along the desired line, we can relate dx and dy: tan=dydxdy=tandxanddx=dytan(2) Now, use equation (2) in (1) to express each integral in terms of only one variable. W=x=0;y=0x=7;y=43y2dx+x=0;y=0x=7;y=4xdyW=y=0y=43y2dytan+x=0x=7xtandx We can determine the tangent of the angle, which is constant (the angle is the angle of the line with respect to the horizontal). tan=4.007.00=0.570 Insert the value of the tangent and solve the integrals. W=30.570y33|y=0y=4+0.570x22|x=0x=7W=112+14=126J (d) Since the work done is not path-independent, this is non-conservative force. Figure P9.30ANSarrow_forwardA force F = (6i 2j) N acts on a panicle that under-goes a displacement r = (3i + j) m. Find (a) the work done by the force on the particle and (b) the angle between F and r.arrow_forward
- If the net work done by external forces on a particle is zero, which of the following statements about the particle must be true? (a) Its velocity is zero. (b) Its velocity is decreased. (c) Its velocity is unchanged. (d) Its speed is unchanged. (e) More information is needed.arrow_forwardCheck Your Understanding There is a second solution to the system of equations solved in this example (because the energy equation is quadratic): v1.f=-2.5m/s , v2.f=0 . This solution is unacceptable on physical grounds; what’s with it?arrow_forwardFind the scalar product between the vectors ? = 5?̂ + 6?̂ + 1? y ? = −3?̂ + 4?̂ − 8?. What is the angle between these two vectors?arrow_forward
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