Physics - September 2007

Ok I have to come up with a conclusion to my theory that you can make a hot dog tarvel through time in a microwave. So I put a hot dog in the microwave and watched spin around for several mins in hopes that it would travel through the vectors time.

2007-09-06 18:58:23 · 8 answers · asked by Andrew G 1

You shoot an arrow into the air. Two seconds later (2.00 s) the arrow has gone straight upward to a height of 30.0 m above its launch point. (a) What was the arrow's initial speed? (b) How long did it take for the arrow to first reach a heightof 15.0 above its launch point?

2007-09-06 18:37:30 · 1 answers · asked by Anonymous

is a building's height a vector? because it's going in an upward direction right...? unless there are slanted buildings... or is that just considered scalar?

2007-09-06 18:24:56 · 4 answers · asked by C Y 2

A person jogs eight complete laps around a quarter-mile track in a total time of 12.5min. Calculate the average speed and the average velocity in m/s?

Speed / velocity/ acceleration/ distance/ displacement
are confusing me soooooooooo much!

2007-09-06 16:26:25 · 1 answers · asked by Anonymous

I need help finding the speed of an object if I was given the distance covered (160 km) and the average speed of the object (67.0 km/h). The objects speed during the first half of the distance is 88.0 km/h. Could anyone please explain how to find the speed of the second half of the distance?

Thanks. =)

2007-09-06 16:26:00 · 1 answers · asked by Anonymous

Can someone please help me figure out if my answer is correct.

Question:
What is the echo time if I snare a drum in the hall outside the room which is 80 meters long. The average echo time was 10 milliseconds. Use Echo Ranging formula to prove or disprove my findings, remember this echo was heard in air.

My answer:
I wrote formula d= r x t
d= 160m ( because 80x 2) the sound must travel back
t= 10 ms = 0.01 seconds
c = 16000m/s ( answer)

Under ideal conditions, this appears to be wrong. As the speed of sound in air travels 344m/s in dry air (temperature of 20 °C (68 °F)). So either the time or the distance measurements are incorrect.

2007-09-06 16:03:07 · 1 answers · asked by julie p 1

what is pressure energy,heat energy,potential energy, and kinetic energy?
I am confused between those terms?Please explain me the difference?
Does pressure energy is potential energy?In what way?
Is heat energy related to potential energy and kinetic energy?In what way?
Is potential energy is there for steam?
Thanking you!!!

2007-09-06 15:59:16 · 1 answers · asked by C P 1

is speed distance or time??

2007-09-06 15:45:07 · 7 answers · asked by Anonymous

2007-09-06 15:38:12 · 1 answers · asked by ags101 2

A rock is thrown vertically upward with a speed of 18.0m/s from the roof of a building that is 70.0m above the ground. Assume free fall.

In how many seconds after being thrown does the rock strike the ground?

What is the speed of the rock just before it strikes the ground?

2007-09-06 15:36:09 · 2 answers · asked by ! 2

b)would its exhaust heat the surrounding air? c)would it vibrate?Would any of its fuel go unused?Explain.

2007-09-06 15:07:16 · 3 answers · asked by Anonymous

2007-09-06 15:07:06 · 1 answers · asked by kamal 1

After a ball rolls off the edge of a horizontal table at time t = 0, its velocity as a function of time is given by the following equation.

vector v=1.9i m/s-9.8tj m/s^2


The ball's displacement away from the edge of the table, during the time interval of 0.390 s during which it is in flight, is given by the following integral.

change of vector r = integral from 0 to .390 S of vector vdt

To perform the integral, you can use the calculus theorem below.

integral of A + Bf(x) dx = integral Adx + B integral of f(x) dx

You can think of the units and unit vectors as constants, represented by A and B. Do the integration to calculate the displacement of the ball.

find i hat

and find j hat

2007-09-06 14:46:42 · 1 answers · asked by surfing86 2

After a ball rolls off the edge of a horizontal table at time t = 0, its velocity as a function of time is given by the following equation.

vector v=1.9 im/s-9.8tj m/s^2


The ball's displacement away from the edge of the table, during the time interval of 0.390 s during which it is in flight, is given by the following integral.

change of vector r = integral from 0 to .390 S of vector vdt

To perform the integral, you can use the calculus theorem below.

integral of A + Bf(x) dx = integral Adx + B integral of f(x) dx

You can think of the units and unit vectors as constants, represented by A and B. Do the integration to calculate the displacement of the ball.

find i hat

and find j hat

2007-09-06 14:44:51 · 2 answers · asked by surfing86 2

2007-09-06 14:25:05 · 2 answers · asked by Teresa 1

plz i need help getting some answers to my review so i can study them for my quiz this monday i thank you for helpin me learn

2007-09-06 14:15:10 · 3 answers · asked by curiousadult 6

is there a specific word ?

2007-09-06 14:08:02 · 5 answers · asked by Anonymous

A) If a flea can jump straight up to a height of 0.490 m, what is its initial speed as it leaves the ground? (Take the free fall acceleration to be g = 9.80 m/s^2)

B) How long is it in the air? (Take the free fall acceleration to be g = 9.80 m/s^2)

I need some help figuring this problem out. What formulas do I need to use? Thanks!

2007-09-06 14:05:56 · 2 answers · asked by Anonymous

I need some help on the third part of this question.

A Honda Civic travels in a straight line along a road. Its distance x from a stop sign is given as a function of time t by the equation x(t)= alpha t^{2}- beta t^{3}, where alpha = 1.56 m/s^2 and beta = 4.80×10−2 m/s^3.

Calculate the average velocity of the car for the time interval t=0 to t_1 = 2.00 s
Answer = 2.93 m/s

Calculate the average velocity of the car for the time interval t=0 to t_2 = 3.99 s.
Answer = 5.46 m/s

Calculate the average velocity of the car for the time interval t_1 = 2.00 s to t_2 = 3.99 s.
This is the part I need help figuring out.....

2007-09-06 13:55:35 · 1 answers · asked by Anonymous

1.What is the momentum of a 39.2 N bowling ball with a velocity of 7.0 m/s?


2.On earth where the acceleration due to gravity is 9.80 m/s2, in Newtons, how much does a 60.0 kg person weigh?

3.An object has a volume of 75.0 cm3 and a density of 14.9 g/cm3. What is the mass of this object in grams?

4.A braking force of 3,000.0 N accelerates a car from 57.8 m/s to rest in 8.2 seconds. What is the mass (in kilograms) of the car?

5.If the Sun is a distance of 1.5 × 1011 m from Earth, how long does it take sunlight (in seconds) to reach Earth if it moves at 3.0 × 108 m/s?

2007-09-06 13:47:07 · 1 answers · asked by miss_su_09 1

Your friend has slipped and fallen. To help her up, you pull with a force F, as the drawing shows. The vertical component of this force is 115 newtons, and the horizontal component is 165 newtons

A) Find The Magnitude
B) Find The Angle


2.) An ocean liner leaves New York City and travels 53.0° north of east for 215 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the following directions?
(a) due east


(b) due north

2007-09-06 13:42:53 · 1 answers · asked by yummy_girlscout 1

How can I solve problems like this?

A car accelerates from rest at -3.00 m/s2.

a. What is the velocity at the end of 5.0 s?
b. What is the displacement after 5.0 s?

How can I work this kind of problem? What do I need to remember for solving problems that inlcudes acceleration and velocity? If any1 help, help will be really appreciated.

2007-09-06 13:30:42 · 1 answers · asked by Man0fWzdom 3

vi=initial sleep
a=acceleration
t=time
note that it is negative acceleration.

2007-09-06 13:22:45 · 1 answers · asked by shaggy 1

How many sig figs does 7.00 have?

2007-09-06 13:21:36 · 1 answers · asked by Anonymous

In other words, if someone dropped an object in midair and it didn't fall to the ground would scientific theories like the theory of gravity need to be re-examined (obviously not rejecting the observed effects and behaviors we are already accustomed to witnessing, but to expand our understanding of how gravity works and eliminating the notion that an object of any mass must ALWAYS fall to the ground when dropped). Or would we just categorize it as "supernatural" and unrelated to existing scientific understanding and current models?

2007-09-06 13:14:20 · 5 answers · asked by whitehorse456 5

2007-09-06 13:08:34 · 2 answers · asked by Anonymous

You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 3.1° above the horizontal. Approximately how far (in kilometers) are you from the base of the arch?


The gondola ski lift at Keystone, Colorado, is 2880 m long. On average, the ski lift rises 14.0° above the horizontal. How high is the top of the ski lift relative to the base?

2007-09-06 13:06:56 · 3 answers · asked by yummy_girlscout 1

a plane cruising at 264m/s accelerates at 19m/s2 for 4.5s. what is the final velocity? how far will it have traveled in that time?

2007-09-06 13:05:00 · 1 answers · asked by Anonymous

Turner's treadmill starts with a velocity of -2.6m/s and speeds up at regular intervals during a half-hour workout. after 37min. the treadmill has a velocity of -8.4m/s. what is the average acceleration of the treadmill during this period?

2007-09-06 13:02:38 · 1 answers · asked by Anonymous

A truck starting from rest (not moving) along a straight road has an acceleration of 1.7 m/s squared.

How far has it gone after
1.2 s?
2.4 s?
3.6 s?

2007-09-06 12:56:45 · 2 answers · asked by Anonymous