I don’t understand what the questions are asking or what formulas or tools I would need to use to solve and understand the problems.1. [-/1 Points]

DETAILS

SERCP11 1.3.P.005.

MY NOTES

ASK YOUR TEACHER

Newton’s law of universal gravitation is represented by

Mm

F = G

where F is the gravitational force, M and m are masses, and ris a length.

Force has the SI units kgm/s2. What are the SI units of the proportionality

constant G?

m3

kg 53

m3

kg.

m2

kg. 33

m2

kg. 52

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2. [-14 Points]

DETAILS

SERCP11 1.4.OP.011.

MY NOTES

ASK YOUR TEACHER

Find the number of significant figures in each of the following.

(a) 62.4 + 0.1

(b) 3.4670 x 109

(c) 2.7000 x 10-6

(d) 0.0019

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3. [-13 Points]

DETAILS

SERCP11 1.4.P.012.

MY NOTES

ASK YOUR TEACHER

The speed of light is now defined to be c = 2.99792458 x 108 m/s.

(a) Express the speed of light to three significant figures.

m/s

(b) Express the speed of light to five significant figures.

m/s

4.0

(c) Express the speed of light to seven significant figures.

m/s

4.0

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4. [-12 Points]

DETAILS

SERCP11 1.5.P.023.

MY NOTES

ASK YOUR TEACHER

A car is traveling at a speed of 35.4 m/s on an interstate highway where the

speed limit is 60.0 mi/h. Is the driver exceeding the speed limit?

O Yes

O No

Justify your answer.

This answer has not been graded yet.

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5. [-12 Points]

DETAILS

SERCP11 1.10.OP.063.

MY NOTES

ASK YOUR TEACHER

Vector A has a magnitude of 31.5 units and it points in a direction 330°

counterclockwise from the positive x-axis. What are the x- and

y-components of A?

Ax =

units

Ay =

units

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6. [-12 Points]

DETAILS

SERCP11 1.10.P.060.

MY NOTES

ASK YOUR TEACHER

Calculate the x-component and the y-component (in m) of the vector with

magnitude 14.0 m and direction 38.00.

HINT

X =

m

y =

m

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7. [-12 Points]

ETAILS

SERCP11 1.10.P.061.

NOTES

ASK YOUR TEACHER

A vector á has components Ax = -7.00 m and Ay = 8.50 m. Find the magnitude (in m)

and the direction (in degrees counterclockwise from the +x-axis) of the

vector.

HINT

magnitude

m

direction

counterclockwise from the +x-axis

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8. (-12 Points]

DETAILS

SERCP11 1.10.P.062.

MY NOTES

ASK YOUR TEACHER

A person walks 11.0° north of east for 2.40 km. How far due north and how

far due east would she have to walk to arrive at the same location?

north

km

east

km

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9. (-12 points)

DETAILS

SERCP11 1.10.OP.068.

MY NOTES

ASK YOUR TEACHER

The map below shows that Atlanta is 730 miles in a direction 5.00° north of

east from Dallas, and that Chicago is 560 miles in a direction 21.0° west of

north from Atlanta. Assuming the Earth may be approximated as flat across

this map, what is the displacement from Dallas to Chicago? Find its

magnitude (in mi) and direction (in degrees) as measured counterclockwise

from due east of Dallas.

Chicago

21.0° .

560 mi

730 miAtlanta

Dallas

5.00

magnitude

mi

direction

counterclockwise from due east of Dallas

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10. [-13 Points)

DETAILS

SERCP11 1.10.P.065.

MY NOTES

ASK YOUR TEACHER

A girl delivering newspapers covers her route by traveling 5.00 blocks west,

3.00 blocks north, and then 8.00 blocks east.

HINT

(a) What is her final position relative to her starting location? (Enter the

magnitude in blocks and the direction in degrees north of east.)

magnitude

blocks

direction

north of east

(b) What is the length (in blocks) of the path she walked?

blocks

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11. [-12 Points]

DETAILS

SERCP11 1.10.P.067.

MY NOTES

ASK YOUR TEACHER

A vector has an x-component of -22.0 units and a y-component of 34.0 units.

Find the magnitude and direction of the vector.

magnitude

(counterclockwise from the +x-axis)

units

direction

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12. [-14 Points]

DETAILS

SERCP11 1.10.P.070.

MY NOTES

ASK YOUR TEACHER

The helicopter view in the figure below shows two people pulling on a

stubborn mule. (Take F, = 132 N and F2 = 84.0 N.)

E F

75.0 60.0°

(a) Find the single force that is equivalent to the two forces

nown.

magnitude

direction

º counterclockwise from the +x-axis

(b) Find the force a third person would have to exert on the mule to

make the net force equal to zero.

magnitude

N

direction

counterclockwise from the +x-axis

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13. [-12 Points]

DETAILS

SERCP11 1.9.OP.058.

MY NOTES

ASK YOUR TEACHER

As you will see in a later chapter, forces are vector quantities, and the total

force on an object is the vector sum of all forces acting on it.

In the figure below, a force F, of magnitude 6.90 units acts on a box at the

origin in a direction o = 31.0° above the positive x-axis. A second force ?, of

magnitude 5.00 units acts on the box in the direction of the positive y-axis.

Find graphically the magnitude and direction (in degrees counterclockwise

from the +x-axis) of the resultant force ř, + F2

E

magnitude

units

direction

counterclockwise from the +x-axis

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14. [-12 points)

DETAILS

SERCP11 1.9.P.055.

MY NOTES

ASK YOUR TEACHER

Vector A has a magnitude of 31 units and points in the positive y-direction.

When vector B is added to Ã, the resultant vector A + B points in the negative

y-direction with a magnitude of 18 units. Find the magnitude and direction of

B.

magnitude

unit(s)

direction

—Select-

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