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borne.

Answer in units of s./n012 (part 3 of 3) 10.0 points

What is the magnitude of the relative angle o

with which the ski jumper hits the slope?

Answer in units of °./n013 10.0 points

A particle is moving at constant speed in a

counterclockwise circle of radius r about the

point x = y = 0. At a certain instant it is at

x = -r, y = 0.

What is the direction of its acceleration at

that instant?

1. It is along ĵ.

2. It is along î.

3. It is along -ĵ.

4. It is along -î./n014 10.0 points

A ball on the end of a string is whirled around

in a horizontal circle of radius 0.394 m. The

plane of the circle is 1.22 m above the ground.

The string breaks and the ball lands 2.56 m

away from the point on the ground directly

beneath the ball's location when the string

breaks.

The acceleration of gravity is 9.8 m/s².

Find the centripetal acceleration of the ball

during its circular motion.

Answer in units of m/s²./n015

10.0 points

A rowboat crosses a river with a velocity of

0.6 m/s at an angle 41° North of West relative

to the water./n41°

0.6 m/s

Water's frame of reference

The river is 519 m wide and carries a current

of 0.89 m/s due East.

Shore's frame

of reference

W

0.89 m/s

S

Us

E

+

m

519

When the boat reaches the opposite bank,

how far East or West (downstream "+" or

upstream "_") from its starting point (on the

opposite bank) does it land.

Note: In your answer, take an Eastward

displacement to be positive and a Westward

displacement to be negative.

Answer in units of m./n016 10.0 points

A bee wants to fly to a flower located due

North of the hive on a windy day. The wind

blows from East to West at speed 6 m/s. The

airspeed of the bee (i.e., its speed relative to

the air) is 14.6 m/s.

In which direction should the bee head in

order to fly directly to the flower, due North

relative to the ground?

Answer in units of East of North.

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