Physics - October 2007

There is a simple sled at the top of a frictionless inclined plane that makes an angle of 32 degrees from the horizontal. Working in the metric system, calculate

(a) the component of the acceleration of gravity parallel to the slope and

(b) the component of acceleration of gravity perpendicular to the slope.

How do I do this? Thanks.

2007-10-09 18:09:44 · 1 answers · asked by labelapark 6

A skateboarder heads down a tunnel, a distance of .8 km, after starting from rest at the top of the tunnel. Assuming a slope of 4 degrees and a frictionless surface, calculate the maximum possible speed at the end of the tunnel (a) in m/sec and (b) mph.

2007-10-09 18:08:05 · 3 answers · asked by labelapark 6

2007-10-09 17:38:22 · 6 answers · asked by Anz 1

Was he born a quadriplegic or did he suffer an injury then become quadriplegic?

For a project, Thanks.

2007-10-09 16:07:33 · 4 answers · asked by Paper.Milk 3

The 65.0 kg pilot sits on a scale. Take g = 10.0 m/s2.

1.On the first loop, the jet comes within 665 m of the ground. The pilot notices that her scale reading at the top of the loop is 325 N. How long does it take to complete this loop?

I know that radius is approx. 1276, but I do not know how to find acceleration when the pilot is right-side up and up-side down.


Thanks in advance!

2007-10-09 15:59:00 · 1 answers · asked by Chris C 2

At 70 mi/hr, a motorcyclist traveling up a 25 degree ramp can jump how many cars at 6 ft per car?

Thanks.

2007-10-09 15:50:56 · 1 answers · asked by labelapark 6

An arrow is launched upwards at an angle of 55 degrees from the horizontal at a speed of 75 m/s. How do I calculate

1. the maximum height to which the arrow rises
2. how long it is in the air before it hits the ground
3. how far away does it land from the launching point?

Thanks.

2007-10-09 15:43:25 · 1 answers · asked by labelapark 6

http://highered.mcgraw-hill.com/tbern/public_html/0072976985/chap3/sect0/prob8/q.html

in the previous picture:

an athlete is exercising while wearing a 5 lb weigh at his ankle (A)

determine the moment of the weight about the knee joint at B

there are other unknowns but I don't need them just this part which I need

2007-10-09 15:21:54 · 1 answers · asked by Anonymous

a guy wire runs from the top of a telephone pole 56 ft high to the ground and pulls on the pole with a force of 290 lbs what is the horizontal pull on the top of the pole?explain!!!!!!

2007-10-09 14:59:29 · 1 answers · asked by Vanessa C 2

interval between the perception of a signal to stop and the application of the brakes.) If an automobile can slow down with an acceleration of 12.0 ft/s^2, compute the total distance covered in coming to a stop after a signal is observed (a) from an initial velocity of 15.0mi/h (in a school zone) and (b) from an initial velocity of 55.0 mi/h.

I was confused about this one. is the problem saying that the the final velocity will be 0 or do I have to figure this out. anyone please help me figure out how to solve this, I would really appreciate it a lot !

2007-10-09 14:44:10 · 2 answers · asked by Anonymous

2007-10-09 14:42:11 · 2 answers · asked by Anonymous

A rock falls from the top of a mountain and it's speed is 70.56m/s and the acceleration of gravity is 9.8m/s^2. How can I find the height of the mountain?

2007-10-09 14:24:48 · 3 answers · asked by <3DA<3 1

A worker pushes horizontally on a 35kg crate with a force of magnitude 110N. The coefficient of static friction between the floor and the crate is 0.37. The crate does not move at this point. Suppose that a second worker pulls directly upward on the crate to help out. What is the least vertical pull that will allow the first worker's 110N push to move the crate. At this point I have found the static frictional force and the maximum frictional force. The difference of the 2 is 16.91 N

2007-10-09 14:20:15 · 1 answers · asked by ndini 2

If you were on the moon. the acceleration of gravity would be 1.6 m/s^2. if you through a ball up at 40m/s, how long would it take for the ball to reach its maximum hieght?


what would happen to the distance an object on the moon falls compared to the distance an object falls on the Earth? compare something that fell for 5 sec and 10 sec


i really need help!! plz include steps so i can try to figure out how you did it!! thanks!

2007-10-09 14:14:54 · 1 answers · asked by Catherine 2

Calculate the resultant velocity of an airplane that normally flies at 200 km/h if it encounters a 50 km/h tail wind. If it encounters a 50 km/h headwind.

Plzz help? what do i do?

2007-10-09 14:08:40 · 1 answers · asked by Anonymous 4

A test vehicle on a track goes through photo gates spaced 25 m apart at the following times: 2.00 sec, 3.30 sec, 4.30 sec

a) Plot the position versus time of the vehicle.

b) Plot the average speed of the vehicle in the time intervals versus time.



Next Q) A rally driver has to maintain a constant speed between checkpoints. She arrives at these points at the following times

26 mi at 31 min 12 sec

48 mi at 57 min 24 sec

87 mi at 1 hr 43 min 15 sec

105 mi at 2 hr 8 min and 49 sec

a) What is the most probable (i.e. average) speed that she is trying to maintain?

b) What is her largest deviation from this average speed?



This is the hard one) What is the acceleration of a vehicle that charges its velocity from 100 km/h to a dead stop in 10 s?

2007-10-09 14:08:32 · 1 answers · asked by Anonymous

Two bulbs of resistances R1 and R2 such that R1 > R2. They are connected in series. Which is brighter? What would be the case if they were connected in parallel?


~So far what I put is that in the series, the one with the least resistance would be the most brightest because it has more current flowing through it (I=V/R)

~If in parallel, I am not sure


Can you please explain to me the correct answer without using any equations. I am very confused.

2007-10-09 14:05:42 · 3 answers · asked by Anonymous

A student determined to test the law of gravity for himself walks off a skyscraper 900ft tall, stopwatch in hand and starts to feefall (velocity initial equals 0 ). Five seconds later superman arrives at the scene and dives off the roof to save him.
A. what must be supermans initial velocity if he is to catch the student just before he hits the ground?
B. What must be the height of the building so that even superman can not save him? (assume supermans acceleration to be that of a free falling body)

PLease HElp!!

2007-10-09 14:05:37 · 1 answers · asked by bubblebee 2

Consider a steady flow of air through the diffuser portion of an axisymmetric wind tunnel. The air speed along the center line decreases from a value of 10 m/s at x=0 to 5 m/s at x=2 meters. The wall of the diffuser is a conical surface whose radius at the entrance is 1.0 meter.

What is an expression for the centerline speed as a function of x?

What is the acceleration along the centerline at x=1 meter?

2007-10-09 14:04:47 · 1 answers · asked by Anonymous

I need to write a hypothesis and procedure on this question but I don't quite see how I can. Any ideas?

2007-10-09 13:43:35 · 12 answers · asked by Anonymous

I know the formula to find current, which is I=q/t, but I need to find t, knowing I and q.

What is the formula?

2007-10-09 13:38:15 · 1 answers · asked by Anonymous

A man carelessly leaves his car on neutral on a 29.5 degree inclined plane on the edge of a cliff. The car rolls of the plane/ falls of the cliff with a velocity of 20 m/s. The ocean below the cliff is 12.6 meters from the edge of the cliff/incline. The accleration og gravity is 9.8m/s2 and air resistance is negligible. How far from the base of the cliff is the car when it hits the ocean ( in meters)

2007-10-09 13:37:32 · 1 answers · asked by Handiman 3

I need a website that explains the physics behind shuffleboard. Does anybody know of any, or can they find any?

2007-10-09 13:31:37 · 2 answers · asked by Cheezer H 1

the velocity of a car is reduced by 40.0 m/s for every second that brakes are applid. If the car i initially moving at the rate of 60.0 m/s how long will it take the car to stop?

what formula do i use ?

thanks =)

2007-10-09 13:28:05 · 1 answers · asked by mya<33 1

Figured id take a shot. If anyone can help with the physics problem it would be much appreciated!Thanks

Two circuits (the figure below) are constructed using identical, ideal batteries (emf = ) and identical lightbulbs (resistance = R). If each bulb in circuit 1 dissipates 5.0 W of power, how much power does each bulb in circuit 2 dissipate? Ignore changes in the resistance of the bulbs due to temperature changes.

-----------------
l---------------l
l---------------l
-----(+)--------l
----(-)---------R
l--------------l <----- Circuit 1
l--------------l (Resistors are in series)
l--------------R
l --------------l
__________________
l---------------l---------------l
l-----(+)-------l--------------l <---- circuit 2
l---(-)----------l---------------l (Resistors are in parallel)
l------ Resistor---- Resistor
l---------------l---------------l
l---------------l---------------l

2007-10-09 13:18:31 · 2 answers · asked by fikltheyr 1

2007-10-09 13:13:06 · 1 answers · asked by Anonymous

2007-10-09 13:06:35 · 1 answers · asked by funnypun 2

A 1.52 kg bottle of vintage wine is lying horizontally in the rack. The two surfaces on which the bottle rests are 90.0° apart, and the right surface makes an angle of 45° with respect to the ground. Each surface exerts a force on the bottle that is perpendicular to the surface. What is the magnitude of each of these forces?
____

2007-10-09 13:03:01 · 1 answers · asked by Marianna E 1

Two identical massless springs are hung from a horizontal surface. A block of mass 1.5kg is suspended from the pair of springs. The accel of grav is 9.81 m/s^2.
When the block is in equilibrium, each spring is stretched an additional 0.54m.
The force constant for EACH spring is?

I tried working this out myself, but would like other feedback.

F = (k)(x)
The only force acting on the springs is the weight of the block.
And x is given, 0.54m, by the stretching of the strings.

(1.5kg)(9.81m/s^2) = (k)(0.54m)

thus k = 27.25 BUT here is where i became confused, as their are two springs, would the force constant be half?? (seeing how the question is "What's the force constant of EACH spring?")

so, k1 = 27.25/2 = 13.625

Feedback Please!

2007-10-09 13:02:00 · 1 answers · asked by Anonymous

The drawing shows a large cube (mass = 22 kg) being accelerated across a horizontal frictionless surface by a horizontal force P. A small cube (mass = 2.8 kg) is in contact with the front surface of the large cube and will slide downward unless P is sufficiently large. The coefficient of static friction between the cubes is 0.71. What is the smallest magnitude that P can have in order to keep the small cube from sliding downward?
____N

2007-10-09 13:00:31 · 1 answers · asked by Marianna E 1