Physics - September 2007

ground. If they are initially d = 9.0 km apart, how long will it be before they reach each other?

_min?

2007-09-19 14:52:39 · 2 answers · asked by sportmatic23 1

a) What is the coefficient of static friction between the box and the floor?
b)If the 40.0 N force continues, the box accelerates at 0.70 m/s^2. What is the coefficient of kinetic friction?

2007-09-19 14:39:13 · 1 answers · asked by J L 2

Here is the entire question:

A canon, located 60 meters from the base of a vertical 25 meter tall cliff, shoots a 15 kilogram shell at 43 degrees above the horizontal toward the cliff.

I found the minimum muzzle velocity for the shell to clear the top of the cliff to be 32.6 m/s.

Under these conditions, how far does the shell land past the edge of the cliff?


Thanks a lot for your time!

2007-09-19 14:29:36 · 1 answers · asked by abc123 1

For the vectors given in Fig. 3-32 (|A| = 60.0 and = 60.0°), determine the following.

Figure 3-32
http://www.webassign.net/giancoli5/3_35alt.gif

(a) A - B + C
Magnitude:___
Direction:___ ° (counterclockwise from the +x axis is positive)
(b) A + B - C
Magnitude:___
Direction:___ ° (counterclockwise from the +x axis is positive)
(c) C - A - B
Magnitude:___
Direction:___ ° (counterclockwise from the +x axis is positive)

2007-09-19 14:25:20 · 2 answers · asked by t_steckbeck 1

2007-09-19 14:15:11 · 2 answers · asked by susyandhensy 1

A sled powered by a rocket engine starts from rest on a frozen lake, accelerates at 13.0 m/s~2 (meters per second squared). At point A, the engine shuts down and sled moves with constant velocity V until point B. The sled travels a total distance of 5.30x10~3 m(5.30 times ten to the third meters) and the total time is 90.0 seconds. Find A, B, and V.

Please, if you can help solve this problem, tell me how you did it, so I can solve other problems like it. Thank you!

2007-09-19 14:14:23 · 2 answers · asked by Rennix 2

does the focusofthelightoutweighthedispersion--yes---duh!!--sorry., but can it be used somhow(don't know how to spell sumhow)(at 9 I.q 140 what happd)if inside a beem of luesance l meant light does phisical law still apply---any studys?

2007-09-19 14:11:50 · 2 answers · asked by dantedemitre 2

The balloon leaves the thrower's hand with a speed of 6.30 m/s. Air resistance may be ignored, so the water balloon is in free fall after it leaves the thrower's hand.

What is its speed after falling for a time 1.85 s?
How far does it fall in a time of 1.85 s?
What is the magnitude of its velocity after falling a distance 11.3 m?

2007-09-19 14:01:46 · 1 answers · asked by Anonymous

If you are standing at a street corner, can anyone explain the reason that the sound of a car coming toward you sounds different than after it passes you? The same is true for police sirens and motorcycles etc., but why is this?

2007-09-19 13:43:27 · 4 answers · asked by Boomer 5

A block of mass m is released from rest at a height R above a horizontal surface. The acceleration due to gravity is g. The block slides along the inside of a frictionless circular hoop of radius R.

Which one of the following expressions gives the speed of the mass at the bottom of the hoop?

a. zero m/s^2
b. v^2 = 2gR
c. v^2=(g^2)/R
d. v = mgR
e. v = mg/2R

2007-09-19 13:10:08 · 2 answers · asked by lil_britt0737 1

Emily takes a trip, driving with a constant velocity of 85.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 66.8 km/h to the north, how long does the trip take?

2007-09-19 13:06:47 · 1 answers · asked by Pauly Walnuts 2

For the vectors given in Fig. 3-32 (|A| = 64.0 and = 58.0°), determine the following.

Figure 3-32
http://www.webassign.net/giancoli5/3_35alt.gif
(a) A - B + C
Magnitude
Direction ° (counterclockwise from the +x axis is positive)
(b) A + B - C
Magnitude
Direction ° (counterclockwise from the +x axis is positive)
(c) C - A - B
Magnitude
Direction ° (counterclockwise from the +x axis is positive)

2007-09-19 12:56:40 · 1 answers · asked by oxblackout12 1

Mike is cutting the grass using a human-powered lawn mower. He pushes the mower with a force of 45 N directed at an angle of 41° below the horizontal direction. Calculate the work that Mike does on the mower in pushing it 9.1 m across the yard.

2007-09-19 12:56:12 · 3 answers · asked by lil_britt0737 1

A 14.7 g sample of sodium carbonate is added to a solution of acetic acid weighing 18.2 g. The two substances react, releasing carbon dioxide gas to the atmosphere. After reaction, the contents of the reaction vessel weighs 25.4 g. What is the mass of carbon dioxide given off during the reaction?


I got 8.0, is that correct. . . .significant figures play a major role in the correct anwser

2007-09-19 12:28:00 · 1 answers · asked by brettmhannan 1

a pilot tries to drop a bag of flour from an airplane flying horizontally at 55.56m/s onto a target on the ground 250m below. with what velocity must he throw the flour up or down if he is foced to release it when he is 500m horizontally from the target.

2007-09-19 12:23:02 · 2 answers · asked by Anonymous

Please explain.

2007-09-19 12:12:05 · 1 answers · asked by Anonymous

I wanna know the Michelson-Morley experiment, what is, how was it made, and its relevance, thank u.

2007-09-19 12:08:40 · 5 answers · asked by dabino 4

what formula is used to solve this problem?

2007-09-19 12:07:33 · 1 answers · asked by Anonymous

Explain and show calculations.
1. Whats the frequency in vibrations per second of a 100 hertz wave?

2. The Sears building sways back and forth at a vibration frequency of about 0.1 Hz. Whats the period of its vibration?

3. A water wave vibrates up and down 2 times each second and the distance between wave crests is 1.5 meters.

a) whats the frequency of the wave?

b) whats the wavelength of the wave?

c) whats the speed of the wave?

4. Whats the wavelength of a 340 Hz sound wave when the speed of sound in air is 340 meters per second?

( period = seconds/cycle , frequency = cycle/second)

2007-09-19 11:47:30 · 1 answers · asked by ... 2

thrown at an angle of 29.0° with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically?

2007-09-19 11:40:59 · 1 answers · asked by hockeywinger14 1

While riding on an elevator descending with a constant speed of 2.4 m/s, you accidentally drop a book from under your arm.
(a) How long does it take for the book to reach the elevator floor, 1.2 m below your arm?
s
(b) What is the book's speed relative to you when it hits the elevator floor?
m/s

2007-09-19 11:38:20 · 1 answers · asked by jkopinto 1

Standing at the edge of a cliff 36.0 m high, you drop a ball. Later, you throw a second ball downward with an initial speed of 8.0 m/s.
(a) The speeds of both balls increase when they reach the base of the cliff. Is the increase of the first ball's speed greater than, less than, or the same as that of the second ball?
greater than
less than
the same as



(b) Verify your answer to part (a) with a calculation. (v) of each.
v = ? m/s (first ball)
v = ? m/s (second ball)

2007-09-19 11:37:00 · 1 answers · asked by jkopinto 1

ground at an angle of 49 degrees With what speed, in SI units, must the animal leave the ground to reach that height?
m/s

2007-09-19 11:36:25 · 1 answers · asked by hockeywinger14 1

Ok if you are just going to say it sounds far fetched so it cant be true dont continually repost that if someone else has. i have heard of this hallow earth theory. it does sound far fetched however has this ever actually been investigated? It is hard to go up to the north and south poles (where then entrance is supposedly. Has anyone ever investigated it i know its been linked with hitler has anyone else?

thanks

2007-09-19 11:23:28 · 4 answers · asked by Footballer54 3

2007-09-19 11:16:14 · 6 answers · asked by lifescircle 5

another name for convention?

2007-09-19 11:10:28 · 2 answers · asked by Anonymous

2007-09-19 11:06:25 · 4 answers · asked by lolabarry 2

I need to know why also. Please help!!!

2007-09-19 11:05:09 · 4 answers · asked by diamond latina 2

2007-09-19 10:59:05 · 5 answers · asked by jevaughn campbell 1

What is the net resistance of the circuit connected to the battery in Fig. 19-41? Each resistance has R = 1.8 k.

Click on the link below. It will bring up the figure of 19-41. There are 12 V in this problem.

http://i24.photobucket.com/albums/c39/immeteen/19_33.gif

2007-09-19 10:49:06 · 4 answers · asked by Jessie L 2