Question 4: Solving Math Problems: A Guide for Students

In summary: When a person is travelling at a fast speed, time will go by slower for them... ...and vice versa. This is called the "rule of thumb".
  • #1
eassam
10
0
I was given this and i need help please!

Question 1:
A person has a trip to of 144km to make.
How long will the trip take at a speed of 144 km/h?
How long will it take a speed of 2km/h?
Construct a table showing the time taken (in hours) to complete the journey at 8 different speeds.
Draw a graph of speed versus time-with speed on the horizontal axis and the time on the vertical axis.
What is the rule connecting speed and time?

Question 2:
On a hot day a deer is standing in a narrow railroad tunnel, 80 metres from the west end of the tunnel.
The deer sees a train approaching the tunnel from the west. the train is traveling at a constant speed - a speed that is 10 times as fast as the deer can run.
The deer thinking quickly, realizes that if she runs towards the train she will emerge from the tunnel when the train is 20 metres from the tunnel. However if she runs away from the train, she will be hit just as she reaches the end of the tunnel.
How long is the tunnel?

Question 3:
Kym was about to get her maths test results. She was excited because her mother Irene had promised to give her 70 cents for every question she got right and Kym had to give back 30 cents for every question she got wrong. Kym came home all excited nad said to her mum "mum you owe me $12.00".

How many possible questions were in the test?
You should come out with atleast three answers.

These are the questions can any1 help, if u give the answer please try to give the working out as well. :blushing:
 
Physics news on Phys.org
  • #2
eassam said:
I was given this and i need help please!
Post your work. How far have you gotten, and where are you having trouble?
Question 1:
A person has a trip to of 144km to make.
How long will the trip take at a speed of 144 km/h?
How long will it take a speed of 2km/h?
Can you answer these two?

You need to figure out the relationship between speed and time before you can answer Question 2.

Question 3: Can you find the two equations you need to solve this?
 
  • #3
i haven't started yet! i need help badly!
 
  • #4
Well, people will help you, but we aren't allowed to do your homework for you.
How many hours do you think it will take to travel 144km at a speed of 144km per 1 hour? After 1 hour, how far will you have travelled?
How many hours do you think it will take to travel 144km at a speed of 2km per 1 hour? After 1 hour, how far will you have travelled?
 
  • #5
and i thought u wud give me answers!
 
  • #6
Here are the rules for homework help: https://www.physicsforums.com/showthread.php?t=28. If you decide to put in some effort, people here can help you through the problems.
 
  • #7
eassam said:
and i thought u wud give me answers!

Well, you were wrong- we don't dislike you so much we would sabotage your education! If you cannot do questions like this- that depend on a fundamental understanding of what something like "kilometers per hour" means then your teacher needs to know that in order to help you. Don't try to trick your teacher into thinking you know things you don't!
 
  • #8
i can do these questions mate but i need help in how to do working out and then do the answers!
 
  • #9
can sum1 provide sum equations?
 
  • #10
q1: How long will the trip take at a speed of 144 km/h? 1 hour
How long will it take a speed of 2km/h? 72 hours

is this right?
 
  • #11
i think q2 is 200 m
 
  • #12
q3 i have no clue what to do?
for q1 Draw a graph of speed versus time-with speed on the horizontal axis and the time on the vertical axis how do i do this? also What is the rule connecting speed and time? how do i find this?
 
  • #13
eassam said:
q1: How long will the trip take at a speed of 144 km/h? 1 hour
How long will it take a speed of 2km/h? 72 hours

is this right?

Yes.

eassam said:
i think q2 is 200 m

How did you get the answer?

eassam said:
q3 i have no clue what to do?
for q1 Draw a graph of speed versus time-with speed on the horizontal axis and the time on the vertical axis how do i do this? also What is the rule connecting speed and time? how do i find this?

You need to find the the amounts of questions answered wrong and right. The situation is constarained by the money condition. Can you form an equation that illustrates the situation based on this?

Speed and time are related to each other by acceleration which tells you how the speed changes as time passes. In general the relation is v(t)=v_0+at where v_0 is the initial speed, a the acceleration and t the time. Think about how the speed changes with time in your assignment. What kind of curves do you think speed vs time should form?
 
  • #14
first two questions are pretty easy...

they can be done by just looking at them and thinking...well the third question can be done easily by some trial and error method...but it doesn't give us two equations that could solve 2 unknowns...1 equation is...X*70-Y*30=1200...can u frame one more eqaution?
 
  • #15
thanks for the help guys can u be more specific please?

inha what do u get for q2? i got it by 20*10=200
what can i do instead?

nomorevishnu what wud u get for q2?
is the equation tested?
 
  • #16
For Question 2, first try to figure out where the train is. Draw a line and label points the train, west end of tunnel, deer, and east end of tunnel, in that order. The distance from the deer to the west end of the tunnel is 80m- label it. When the deer reaches the west end of the tunnel, it will have traveled 80m. How far will the train have traveled in this time (speed of train = 10 times speed of deer)?
 
  • #17
don't worry guys i ahve figured every thing out by myself thanks for the help provided!
 

What is "Investigation Homework"?

Investigation Homework is a type of homework assignment that requires students to conduct research and gather evidence to answer a specific question or solve a problem.

Why is "Investigation Homework" important?

"Investigation Homework" is important because it encourages students to think critically, develop research skills, and apply knowledge to real-world situations. It also allows students to take ownership of their learning and explore topics of interest.

How is "Investigation Homework" different from traditional homework?

"Investigation Homework" differs from traditional homework in that it requires students to actively engage in the learning process by conducting research, analyzing data, and drawing conclusions. It also typically involves a longer time frame and more open-ended questions compared to traditional homework.

What are some tips for completing "Investigation Homework" successfully?

To complete "Investigation Homework" successfully, it is important to carefully read and understand the assignment instructions, conduct thorough research, organize and analyze the gathered information, and present the findings in a clear and concise manner. It is also helpful to start early and seek guidance from teachers or peers if needed.

How can "Investigation Homework" benefit students?

"Investigation Homework" can benefit students in many ways. It can enhance their critical thinking skills, improve their research abilities, and foster a deeper understanding of the subject matter. It also allows students to develop self-directed learning skills and prepares them for future academic and professional endeavors.

Similar threads

  • Introductory Physics Homework Help
Replies
14
Views
2K
  • Introductory Physics Homework Help
Replies
3
Views
774
  • Introductory Physics Homework Help
Replies
8
Views
4K
  • Introductory Physics Homework Help
Replies
5
Views
636
  • Introductory Physics Homework Help
Replies
5
Views
2K
  • Sci-Fi Writing and World Building
Replies
7
Views
986
  • Introductory Physics Homework Help
Replies
2
Views
3K
  • Calculus and Beyond Homework Help
Replies
3
Views
1K
  • Introductory Physics Homework Help
Replies
1
Views
3K
  • Introductory Physics Homework Help
Replies
4
Views
2K
Back
Top