Question 1, chap 101, sect 7. part 1 of 2 10 points The elevators in the John Ha

Question

Question 1, chap 101, sect 7.

part 1 of 2 10 points

The elevators in the John Hancock building in Chicago move 788 ft in 35 s.

a) What is their speed in meters per sec- ond?

Answer in units of m/s.
Question 2, chap 101, sect 7.

part 2 of 2 10 points
b) What is this speed in miles per hour?

Answer in units of mi/h.
Question 3, chap 101, sect 7.

part 1 of 1 10 points

Convert 37.6 mi/h to m/s. You may need 1 mi = 1609 m.
Answer in units of m/s.

Question 4, chap 103, sect 6.

part 1 of 1 10 points

A car travels 1.46 km in the x-direction, then turns left 56.8 to the original direction and travels an additional distance of 3.69 km.

Calculate the x component of the car’s net displacement.
Answer in units of km.

Question 5, chap 103, sect 6.

part 1 of 2 10 points

A person walks 30.0 north of east for 3.31 km. Another person walks due north and due east to arrive at the same location.

a) How large is the east component of this second path?
Answer in units of km.

Question 6, chap 103, sect 6.

part 2 of 2 10 points

b) How large is the north component of this second path?
Answer in units of km.

Question 7, chap 103, sect 9.

part 1 of 2 10 points

A plane travels 2.4 km at an angle of 39 to the ground, then changes direction and travels 6.5 km at an angle of 14 to the ground.

a) What is the magnitude of the plane’s total displacement?
Answer in units of km.

Question 8, chap 103, sect 9.

part 2 of 2 10 points

b) At what angle above the horizontal is the plane’s total displacement?
Answer in units of .

Question 9, chap 103, sect 9.

part 1 of 2 10 points

A man pushing a mop across a floor causes the mop to undergo two displacements. The first has a magnitude of 211 cm and makes an angle of 145 with the positive x-axis.

The resultant displacement has a magni- tude of 187 cm and is directed at an angle of 23.8 to the positive x-axis.

Find the magnitude of the second displace- ment.

Answer in units of cm.

Question 10, chap 103, sect 9.

part 2 of 2 10 points

Find the direction of the second displace- ment with respect to positive x axis. (Con- sider counterclockwise to be positive and an- swer within the limits of 180 to 180.) Answer in units of .

Question 11, chap 103, sect 9.

part 1 of 1 10 points

A quarterback takes the ball from the line of scrimmage, runs backward for 12.0 yards, then runs sideways parallel to the line of scrimmage for 17.0 yards. At this point, he throws a 21.0 yard forward pass straight down the field.

What is the magnitude of the football’s

Explanation / Answer

Question 1)

a) speed is V = distance travelled / time taken = 788 /35 = 22.5 ft/sec

but 1 ft = 0.3048

V = 22.5*0.3048 = 6.858 m/sec

Question 2)

b) speed in miles per hour

1 m/sec = 2.24 miles per hour

then 6.858 m/sec = 6.858*2.24 = 15.362 miles per hour

Question 3)

37.6 mi/h = 37.6*1609 m / (3600 sec) = 99.22 m/sec

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