Physics - September 2007

Tarzan, who weighs 820 N, swings from a cliff at the end of a 20 m vine that hangs from a high tree limb and initially makes an angle of 22 degrees with the vertical. assume than an x axis extends horizontally away from the edge of the cliff and the y axis extends upward. Immediately after Tarzan steps off the cliff the tension in the vine is 760 N. Just then, what are (a) the force on him from the vine in unit vector notation and the net force on him (b) in unit-vector notation and as (c) a magnitude and (d) an angle relative to the positive direction of the x axis? What are the (e) magnitude and (f) angle of Tarzan's acclereation just then.

I'm completely lost on what to do.

2007-09-18 14:52:46 · 1 answers · asked by keeptheuroalive 2

2007-09-18 14:51:34 · 1 answers · asked by schuggyt 1

A cylindrical container with a cross-sectional area of 65.2cm^2 holds a fluid of density 806 kg/m^3. At the bottom of the container the pressure is 116 kPa.

What is the depth of the fluid?

What equation do i have to use to figure depth out

2007-09-18 14:41:45 · 1 answers · asked by Anonymous

What is the normal force of the pool bottom on the rock (in Newtons)?

2007-09-18 14:39:58 · 2 answers · asked by ryoukai_chang 1

A 0.37 kg particle moves in an xy plane according to x(t) = - 16 + 2 t - 2 t3 and y(t) = 19 + 5 t - 4 t2, with x and y in meters and t in seconds. At t = 0.6 s, what are (a) the magnitude and (b) the angle (relative to the positive direction of the x axis) of the net force on the particle, and (c) what is the angle of the particle’s direction of travel?

2007-09-18 14:39:21 · 1 answers · asked by keeptheuroalive 2

A soccer player kicks a rock horizontally off a 38.0 m high cliff into a pool of water. If the player hears the sound of the splash 3.4 s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.

2007-09-18 14:33:29 · 2 answers · asked by Anonymous

One of the fastest recorded pitches in major-league baseball, thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h (Fig. P3.22). If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 60.5 ft away

2007-09-18 14:29:46 · 1 answers · asked by Anonymous

In the javelin throw at a track and field event, the javelin is launched at a speed of 31 m/s at an angle of 36° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angle to be reduced from 36° at launch to 19°?

2007-09-18 14:23:08 · 3 answers · asked by Anonymous

I don't understand this...PLEASE PLEASE HELP!!! thanks

A train travels between stations 1 and 2. The engineer of the train is instructed to start from rest at station 1 and accelerate uniformly between points A and B, then coast with a uniform velocity between points B and C, and finally accelerate uniformly between points C and D until the train stops at station 2. The distances AB, BC, and CD are all equal, and it takes 5.00 min to travel between the two stations. Assume that the uniform accelerations have the same magnitude, even when they are opposite in direction.
a) How much of this 5.00 min period does the train spend between points A and B?
b) How much of this 5.00 min period does the train spend between points B and C?

2007-09-18 14:20:58 · 1 answers · asked by lilcbcgurl 1

When it has reached a height of 590 m, its engines suddenly fail so that the only force acting on it is now gravity.

What is the maximum height this rocket will reach above the launch pad?
How much time after engine failure will elapse before the rocket comes crashing down to the launch pad?
How fast will it be moving just before it crashes?

2007-09-18 14:20:23 · 1 answers · asked by Anonymous

I don't understand these...PLEASE HELP!!! thanks

Two cars are traveling along a straight line in the same direction, the lead car at 25 m/s and the other car at 35m/s. At the moment the cars are 45m apart, the lead driver applies the brakes, causing the car to have an acceleration of –2.0m/s(squared).
a) How long does it take for the lead car to stop?
b) Assume that the driver of the chasing car applies the brakes at the same time as the driver of the lead car. What must the chasing car’s minimum negative acceleration be to avoid hitting the lead car?
c) How long does it take the chasing car to stop?

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at 13.0m/s(squared). At t1 the rocket engine is shut down and the sled moves with constant velocity v until t2. The total distance traveled by the sled is 5300 m and the total time is 90.0s. Find t1, t2, and v

2007-09-18 14:19:39 · 1 answers · asked by lilcbcgurl 1

What is the container's volume?


What is the pressure if the temperature is raised to 150 degrees Celsius?

2007-09-18 14:17:37 · 2 answers · asked by ryoukai_chang 1

does anyone know how to do this?...im really confused and don't know how!thanks


A professional race-car driver buys a car that can accelerate at 5.9 m/s(squared). The racer decides to race against another driver in a souped-up stock car. Both start from rest, but the stock-car driver leaves 1.0s before the driver of the sports car. The stock car moves with a constant acceleration of 3.6 m/s(squared).
a)Find the time it takes the sports-car driver to overtake the stock-car driver.
bFind the distance the two drivers travel before they are side by side.
c)Find the velocities of both cars at the instant they are side by side

2007-09-18 14:15:51 · 1 answers · asked by lilcbcgurl 1

but only one is shown. It also shows the acceleration of the box.
(a) Find the second force in unit-vector notation.
( N) i + ( N) j
(b) Find the second force as a magnitude and direction.
N, ° (counterclockwise from the +x-axis is positive)

2007-09-18 14:09:29 · 2 answers · asked by Wonder 2

A 920 kg car is pulling a 290 kg trailer. Together, the car and trailer have an acceleration of 2.24 m/s2 in the forward direction. Neglecting frictional forces on the trailer, determine the following (including sign).

(c) the force exerted by the trailer on the car
____N
(d) the resultant force exerted by the car on the road
magnitude
____N
direction
____° measured from the left of vertically downwards

I am having trouble with these problems; can someone please explain how to do them\? thank you

2007-09-18 13:57:57 · 1 answers · asked by redblitz528 1

1. An airplane has a mass of 29,000 kg and takes off under the influence of a constant net force of 45,000 N. What is the net force that acts on the plane's 80 kg pilot????
Why? How?

2. During a circus performance, a 71kg human cannonball is shot out of a 15m long cannon. If the human cannonball spends 0.82 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.

2007-09-18 13:57:07 · 1 answers · asked by gimp4102 1

A jet accelerates from 15.98 m/s to 34.05 m/s in 12.90 seconds. The displacement (to the nearest meter) of the jet during this time interval is:

2007-09-18 13:50:09 · 2 answers · asked by ags101 2

In the sum A+B =C ,vector A has a magnitude of 13.5 m and is angled 38.0° counterclockwise from the +x direction, and vector C has a magnitude of 14.0 m and is angled 13.4° counterclockwise from the -x direction.

What are (a) the magnitude and (b) the angle (relative to +x) of B? State your angle as a positive number.

2007-09-18 13:48:31 · 1 answers · asked by Anonymous

Two trains, one traveling at 64.00 km/h and the other at 128.00 km/h, are headed toward one another along a straight, level track. When they are 736 m apart, each engineer sees the other's train and applies the brakes. What acceleration do the two trains need to have to stop exactly in a distance of 736 m?

2007-09-18 13:43:27 · 3 answers · asked by Ryan 1

A red car moving at 44.7 mph passes a blue car moving at 30.7 mph. (Use 1609 meters = 1 mile when converting to meters/second.) Seeing a stopped car in his lane up ahead, the driver of the red car applies the brakes just as he passes the blue car which causes the red car to slow down to a stop by losing 4.36 m/s every second.



(a) How much time (in seconds) passes before the two cars are side-by-side once again?
s




(b) When the cars are finally side-by-side, how do their average speeds compare for the time you calculated above? Please explain fully.

2007-09-18 13:39:34 · 1 answers · asked by ags101 2

A world-class sprinter can burst out of the blocks to essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. What is the average acceleration of this sprinter and how long does it take her to reach that speed? Please show/explain work clearly.

2007-09-18 13:32:09 · 1 answers · asked by nirmal 1

2007-09-18 13:20:27 · 1 answers · asked by Anonymous

Convert each other the following time measurements to its equivalent in seconds.

a. 58 ns
b. o.o46 Gs
c. 9270 ms
d. 12.3 ks

2007-09-18 13:20:15 · 1 answers · asked by cahill_hooker 2

2007-09-18 13:05:42 · 2 answers · asked by Anonymous

One-dimensional motion.

2007-09-18 13:03:46 · 2 answers · asked by Anonymous

A car starts from rest and accelerates for 8.6 seconds with an acceleration of 2.8 m/s^2
How far does it travel in meters?

2007-09-18 13:00:47 · 4 answers · asked by fatiimaq08 3

Okay there is a sharp turn going down the road toward my house. Everytime I turn on it I must slow down. Can someone please tell me the physics of this. Does this have to do with Angular momentum? Friction? I have no clue and I decided to do a project on it just because I have nothing else. Thanks for the answers. God bless!

2007-09-18 12:58:22 · 6 answers · asked by Albondigas 2

2007-09-18 12:55:55 · 5 answers · asked by yeah! yeah! yeah! 1964 1

A skydriver jumps from a helicopter hovering at high altitude. If there were no air resistance, how fast would she be falling 12s after jumping?

2007-09-18 12:54:46 · 1 answers · asked by Anonymous

Even If you only know one that would help aLOT! Thankyou soo much

2007-09-18 12:52:26 · 2 answers · asked by Anonymous