Question

@princeharryyy

Answer 1

1. What is the shortest possible time in which a bacterium could travel a distance of 8.4 cm across a Petri dish at a constant speed of 4.5 mm/s? 18 seconds

84/4.5=18

2. A child is pushing a shopping cart at a speed of 1.5 m/s. How long will it take this child to push the cart down an aisle with a length of 9.7 m? 6.4 seconds

9.7/1.5=6.4666

3. does knowing the distance between two objects give you enough information to locate the objects? Explain. No, you need to know the direction and magnitude as well.

4. The figure shows position-time graphs of the straight-line movement of tow brown bears in a wildlife preserve. Which bear has the greater average velocity over the entire period? Which bear has the grater velocity at t=8.0 min? Is the velocity of bear A always positive? Is the velocity of bear B ever negative?

Bear B has the greater average velocity over the entire period. (Bear B went a further distance). Bear A has a greater velocity at t=8.0. (Bear A has a steeper slope).

Answer 2

first one is wrong. see the units are different.

Answer 3

one is in cm other in mm

Answer 4

convert mm into cm and solve

Answer 5

1mm = 0.1 cm so 4.5 mm/s = 0.45cm/s
>> 84/0.45=186.6667 seconds

Answer 6

second one is right :)

Answer 7

third one is right :)

Answer 8

avg velocity of bear A over entire period= (1700-0)/(60-0) = 1700/60 =28.33,
avg velocity of bear B over entire period= (2700-100)/(60-0) = 2600/60 =43.33

Bear B has greater overall average velocity

Answer 9

Which bear has the grater velocity at t=8.0 min?

>> A at 8 => around 500/8 = 62.5
B at 8 => around 200/8 = 25 Bear A has greater velocity at t=8

Answer 10

Is the velocity of bear A always positive?
No it isn't

Answer 11

Is the velocity of bear B ever negative?
No, Never.

Answer 12

and yes hold on, your answer of question 1 is 84/4.5 = 18.66667 s that was correct
or 8.4/0.45 = 18.6667 I wrote that 84 by mistake. But, 18.66667 s is the right answer

Answer 13

Sorry about that, my bad*

Answer 14

that's all I guess. :)

Answer 15

thank you!!

Answer 16

:)