Physics - September 2007

explain

2007-09-09 07:55:06 · 1 answers · asked by chelseaaa 1

The hare and the tortoise are at the starting line together. When the gun goes off, the hare moves off at a constant speed of 15 meters per second. (Ignore the acceleration required to get the animal to this speed.) The tortoise starts more slowly, but accelerates at the rate of 4 meters per second squared. How long will it be before the tortoise passes the hare?

2007-09-09 07:49:23 · 2 answers · asked by Brian 4

An electron, starting from rest and moving with a constant acceleration, travels 2 cm in 11 ms. What is the magnitude of this acceleration in km/s^2?

2007-09-09 07:47:16 · 2 answers · asked by student 1

If a block of dry ice were put into a sealed container of liquid oxygen, will the dry ice stay permanently solid?

Also, will the dry ice keep the liquid oxygen liquid? Thx.

2007-09-09 07:33:22 · 4 answers · asked by delta dawn 4

2007-09-09 07:28:00 · 2 answers · asked by lil missy 2

can anybody explain to me what is physics? plz add informin details!

2007-09-09 07:13:00 · 16 answers · asked by ajaz 1

why is it not possible to travel faster then light

2007-09-09 07:01:56 · 9 answers · asked by some people are rude 2

The charge distribution is an open-ended cylindrical shell of charge q, radius R, and length H (a cylindrical side with no ends). The Gaussian surface S is a cylindrical shell with radius r and length h, with r > R. Determine the net electric flux given that q = 8Q, R = 5L, H = 4L, r does not apply, and h = 3L (type the integer value, along with the sign, without typing units Q/e0):


Please help me..

2007-09-09 06:59:47 · 2 answers · asked by NOne N 1

2007-09-09 06:51:59 · 3 answers · asked by LUCKY3 6

A fish swimming in a horizontal plane has velocity vi = (4.00 i - 3.00 j) m/s at a point in the ocean whose displacement from a certain rock is ri = (10.0 i + 4.00 j) m. After the fish swims with constant acceleration for 15.0 s, its velocity is v = (16.0 i - 5.00 j) m/s.
Q: What direction of acc with respect to vector i? Where is fish at t=20 s? What direction is ti moving?

2007-09-09 06:39:06 · 1 answers · asked by ひいらぎ 5

2007-09-09 06:36:36 · 5 answers · asked by king c 1

A car starts from rest and travels for 4.9 s with a uniform acceleration of +1.2 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.2 m/s2. The breaks are applied for 1.70 s.
How far has the car gone from its start?

2007-09-09 06:32:17 · 2 answers · asked by ? 1

A bus slows down uniformly from 69.7 km/h (19.4 m/s) to 0 km/h in 24 s. How far does it travel before stopping?

2007-09-09 06:31:39 · 3 answers · asked by ? 1

A sailboat starts from rest and accelerates at a rate of 0.23 m/s2 over a distance of 406 m.
(a) Find the magnitude of the boat's final velocity.
(b) Find the time it takes the boat to travel this distance.

2007-09-09 06:30:16 · 3 answers · asked by ? 1

2007-09-09 06:19:43 · 2 answers · asked by Anonymous

2007-09-09 06:18:51 · 2 answers · asked by Anonymous

2007-09-09 06:17:19 · 3 answers · asked by Anonymous

2007-09-09 06:16:41 · 3 answers · asked by Sophia 1

Starting from a pillar, you run 220 m east (the +x direction) at an average speed of 4.0 m/s, and then run 280 m west at an average speed of 8.0 m/s to a post.

Calculate your average velocity from pillar to post

I already tried taking the diferance in the distance covered and the differance in time covered and I got -3 m/s.. which is wrong.. But what I did was i diveded 220/4 to get 55 seconds and then 280/8 to get 35 seconds . then I toook the 280-220/35-55 to get -3 m/s but its wrong

2007-09-09 06:15:02 · 1 answers · asked by Walachka 3

imagine, u r inside, an empty train compartment, while the train is traveling at a very high velocity in vaccum. now u jump up inside the compartment. wen u get down would u be exactly at the same place u jumped from or not. if so why?

2007-09-09 06:13:31 · 5 answers · asked by Anonymous

nutritional caloric content of a 10 gallon tank of gas? (3.8 L = 1 gal)

2007-09-09 05:56:53 · 1 answers · asked by Varun S 1

At time t1, the dot P painted on the rim of the wheel is the point of contact between the wheel and the floor, as shown in th figure below. At a later time t2, the wheel has rolled through two and a half revolutions.
What is the magnitude of the displacement of P?
What is the angle (relative to the floor) of the displacement of P?

2007-09-09 05:45:57 · 6 answers · asked by Wonder 2

2007-09-09 05:02:06 · 13 answers · asked by awi v 1

Just get the light going with another light source then shine it at the panel then hey perment light? perpetual energy?

2007-09-09 04:58:26 · 15 answers · asked by Rick K 2

A biologist is studying the growth of rats in an orbiting space station. To determine a rat's mass, she puts it in a 305 g cage, attaches a spring scale, and pulls so the scale reads 0.46 N. If the resulting acceleration of the rat and cage is 0.35 m/s2, what is the rat's mass?

2007-09-09 04:57:13 · 1 answers · asked by dsgdh 2

A 4000 kg jet touches down at 240 km/h on the deck of an aircraft carrier, and immediately deploys a parachute to slow itself down. If the plane comes to a stop in 155 m, what is the average force of air on the parachute? Assume the parachute provides essentially all the stopping force.

2007-09-09 04:55:14 · 1 answers · asked by dsgdh 2

A hawk is flying horizontally at 20.0 m/s in a straight line, 240 m above the ground. A mouse it has been carrying struggles free from its grasp. The hawk continues on its path at the same speed for 2.00 s before attempting to retrieve its prey. To accomplish the retrieval, it dives in a straight line at constant speed and recaptures the mouse 3.00 m above the ground.
Q: Assume no air resis, find diving speed. And what angle with horz during decent.

I got the time the mouse had until the hawk caught him again: 6.96 seconds

2007-09-09 04:43:20 · 1 answers · asked by ひいらぎ 5

A meterstick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with those two fingers. You can calculate your reaction time from the distance the meterstick falls, read directly from the point where your fingers grabbed it.

If the measured distance is 18.1 , what is the reaction time?

The correct answer involves the variable g.

2007-09-09 04:39:40 · 1 answers · asked by M C 1

2007-09-09 04:36:02 · 2 answers · asked by Victor Dang(520) c 1

A small map shows Pittsburgh to be 343 miles in a direction 23° north of east from Louisville. The same map shows that Detroit is 209 miles in a direction 48° west of north from Pittsburgh. Assume a flat earth and use the given information to find the displacement from Louisville to Detroit.

What is the magnitude and the direction?

2007-09-09 04:09:54 · 3 answers · asked by dazedandconfused 2