Question

A swimmer is working on decreasing the time it takes him or her to do laps. The swimmer works from swimming 1.5 m in 30 s to 1.8 m in 30 s. What is the difference in velocities of this swimmer
@willie579
@ilikenachose99

Answer 1

Do you know what the equation for velocity is?

Answer 2

v=time/distance=v

Answer 3

@ilikenachos99 There. :P

Answer 4

lol

Answer 5

Not quite. Velocity equals distance over time. You are given the distance and time in two situations so you should be able to solve this. For example for the first one the velocity would be 1.5/30. Then find the second velocity and subtract them from each other

Answer 6

Does this make sense?

Answer 7

makes sense for me.

Answer 8

ummmmmmmm not really

Answer 9

ok so 1.5m/30s=0.05m/s. for the second equation 1.8m/30s=0.06m/s. So the difference between the velocities is 0.06m/s-0.05m/s which equals 0.01m/s

Answer 10

ohhh youu do both

Answer 11

Yep! I hoped this helped

Answer 12

You create a wave by whipping a rope up and down. What is the speed of the wave if the wavelength is 2 meters (m) and the time is 0.5 seconds (sec)?

0.25 m/sec
4.0 m
4.0 m/sec
0.25 sec
can you explain this one because you cant add in this one

Answer 13

Sure. So speed is still distance over time. In this problem the distance is 2 meters and the time is 0.5 seconds. So 2m/0.5 sec=4m/sec. Does this make sense?

Answer 14

yahh so you just need the equations right?

Answer 15

yes all you need to do is apply the equation Velocity=distance (m)/time (sec) and you will be able to solve all of these kinds of problems

Answer 16

noah are you from hawaii

Answer 17

umm yes why

Answer 18

It is easier to stop a slow-moving train than it is to stop a fast-moving train. This is an example of which law of motion?

Newton’s first law of motion
Newton’s third law of motion
Newton’s second law of motion
Newton’s fourth law of motion

@langenstroer

Answer 19

Newtons first law: an object that is at rest stays at rest and an object in motion stays in motion unless an external force is applied--clearly not this one because in this case we are applying an external force
Newtons second law: the greater the mass the greater the force needed to stop the object. This is the write answer because even though the mass is the same the velocity is greater which means a greater force is needed to stop the object moving faster. ----RIGHT ANSWER
Newtons third law: for every action there is an equal and opposite reaction-not it because this force is not equal to the force moving the car
Newtons fourth law: does not exist there is no fourth law

Answer 20

oh i new he had no forth law.

and since the force is needed to be stoped because its bigger and need to slow it down yeah

Answer 21

How will the mass of a rocket change when it has reached outer space?

The rocket will have more mass.
The rocket will have less mass.
The rocket’s mass will not change.
It depends on how far out in space the rocket travels.
is this one A
@langenstroer

Answer 22

Nope. So the mass of the rocket will not change as it goes into outer space. It will technically have the same mass because the mass of an object never changes. However the weight of the object will change because the change in gravity. So the answer is C