Physics - October 2007

When you take your 1200 kg car out for a spin, you go around a corner of radius 58.1 m with a speed of 15.8 m/s. The coefficient of static friction between the car and the road is 0.69. Assuming your car doesn't skid, what is the force exerted on it by static friction?

Please help. Neither I nor my study group can figure this one out.

2007-10-12 06:29:44 · 3 answers · asked by Anonymous

2007-10-12 06:13:00 · 8 answers · asked by Charlotte 2

A steep cliff west of Lydia's home reflects a 995 kHz radio signal from a station that is 74 km due east of her home. If there is destructive interference, what is the minimum distance of the cliff from her home? Assume there is a 180° phase shift when the wave reflects from the cliff.
in m

2007-10-12 06:05:45 · 2 answers · asked by romaine_style 1

The radio telescope at Arecibo, Puerto Rico, has a reflecting spherical bowl of 300 m diameter. Radio signals can be received and emitted at various frequencies with appropriate antennae at the focal point of the reflecting bowl. At a frequency of 200 MHz, what is the angle between two stars that can barely be resolved?
answer in mrad

2007-10-12 06:04:01 · 3 answers · asked by romaine_style 1

Does the force of kinetic friction depend on the weight of the block? Does the coefficient of kinetic friction depend on the weight of the block?

2007-10-12 05:58:55 · 6 answers · asked by Natiphy2007 1

2007-10-12 05:49:06 · 2 answers · asked by Mary C 1

A 150 kg chunk of coal has a speed of 0.55 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.

2007-10-12 05:46:14 · 1 answers · asked by Anonymous

What does it mean when a variabvle in a physics text is written in bold?

2007-10-12 05:22:56 · 4 answers · asked by RogerDodger 1

2007-10-12 05:20:34 · 7 answers · asked by Anonymous

Is it possible, even theoretically, to bend or otherwise manipulate the fabric of space-time other than by the gravity effect of a mass?

2007-10-12 05:10:36 · 3 answers · asked by juicy_wishun 6

When you take your 1200 kg car out for a spin, you go around a corner of radius 54.6 m with a speed of 15.3 m/s. The coefficient of static friction between the car and the road is 0.91. Assuming your car doesn't skid, what is the force exerted on it by static friction?

2007-10-12 04:48:29 · 1 answers · asked by Anonymous

A car goes around a curve on a road that is banked at an angle of 30.0°. Even though the road is slick, the car will stay on the road without any friction between its tires and the road when its speed is 22.0 m/s. What is the radius of the curve?

2007-10-12 04:41:52 · 1 answers · asked by Anonymous

When Skylab reentered the Earth's atmosphere on July 11, 1979, it broke into a myriad of pieces. One of the largest fragments was a 1680 kg lead-lined film vault, and it landed with a estimated speed of 120 m/s. What was the kinetic energy of this film vault when it landed?

2007-10-12 04:40:55 · 1 answers · asked by Anonymous

The ampere is a constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed 1 meter apart in a vacuum, would produce between these conductors a force equal to 2×10–7 newton per meter of length.

IN THIS, WHAT DO U MEAN BY "NEGLIGIBLE CIRCULAR CROSS SECTION" ?

2007-10-12 04:28:00 · 1 answers · asked by Anonymous

2007-10-12 03:32:32 · 6 answers · asked by Hermione 2

A sky diver of mass 80.0 kg (including parachute) jumps off a plane and begins her descent.
Throughout this problem use 9.80 m/s^2 for the magnitude of the acceleration due to gravity.

For an object falling through air at a high speed , the drag force acting on it due to air resistance can be expressed as

F = Kv^2

where the coefficient K depends on the shape and size of the falling object and on the density of air. For a human body, the numerical value for K is about 0.250 kg/m.

Using this value for K, what is the terminal speed v-terminal of the sky diver?
Express you answer in meters per second.

B) When the parachute is fully open, the effective drag coefficient of the sky diver plus parachute increases to 60.0 kg/m. What is the drag force F(drag) acting on the sky diver immediately after she has opened the parachute?

C) What is the terminal speed v(terminal) of the sky diver when the parachute is opened?
Express your answer in meters per second.

2007-10-12 03:29:44 · 1 answers · asked by Nick S 1

I'm having this question in Resonance tube experiment.

2007-10-12 03:25:06 · 2 answers · asked by Hermione 2

2007-10-12 03:17:52 · 4 answers · asked by John S2005 3

A 5.50 g bullet is fired horizontally into a 1.10 kg wooden block resting on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.200. The bullet remains embedded in the block, which is observed to slide 0.230 m along the surface before stopping. What was the initial speed of the bullet?

2007-10-12 03:15:01 · 2 answers · asked by KT 1

a sling has a length of 0.6m and can revolve at 8rps. What is the centripetal acceleration of the stone at 8 rps?

2007-10-12 03:12:25 · 1 answers · asked by Moth 3

A 15.0 kg block is attached to a very light horizontal spring of force constant 550 N/m and is resting on a smooth horizontal table. Suddenly it is struck by a 3.00 kg stone traveling horizontally at 8.00 m/s to the right, whereupon the stone rebounds at 2.00 m/s horizontally to the left. Find the maximum distance that the block will compress the spring after the collision.

2007-10-12 03:11:52 · 2 answers · asked by KT 1

How do I find mass and density if the only measurements I have are length, diameter, and weight?

2007-10-12 02:53:48 · 3 answers · asked by leobvious 1

How would you go about solving this problem?

"An object with a mass of 3.45 kd is pulled up a slope that is 36 meters long to a height of 3 meters. There is no friction and the acceleration is constant. The speed at the bottom of the slope is 3.5 m/s and the speed at the top of the slope is 5.5 m/s. The average power developed by the motor pulling the object is...?"

Any help is greatly appreciated.

2007-10-12 02:35:41 · 2 answers · asked by emuhlee15 2

2007-10-12 02:31:35 · 7 answers · asked by Stuart 2

A Lufthansa A320 accelerates from rest to liftoff speed of 72.8 m/s in 28.3 s. Each of the plane's two jet engines provides a forward force (thrust) of 111 kN.

(a) What is the mass of the plane?
kg
(b) How far does it travel down the runway before liftoff?
m

part a I got 1.1326e4 kg and part b is 1030.1m. part I solved mult times and all of the solutions I got are wrong, but part b is correct. any ideas on how to find the mass of the engine? thanks!

2007-10-12 01:31:19 · 2 answers · asked by Anonymous

NaNo is here, RF could be the alternative? (beam me-up, spock)

2007-10-12 01:27:53 · 3 answers · asked by Anonymous

I know it has something to do with disfiguration of the ball and the potential energy, although I dont have a good explanation to why

2007-10-12 00:58:17 · 10 answers · asked by Anonymous

in what direction do you see the change to be at higher shear rate?

2007-10-11 23:56:17 · 2 answers · asked by oopsy 1

relating periods and sizes of orbits..

2007-10-11 23:52:57 · 3 answers · asked by imnotyours 1

A 10 meter long beam is supported on the ends. It has a mass of 980 kg, and 2 loads: load 1 is placed 2 meters from the left end and is 1500 kg in mass, load 2 is placed 4 meters from the right end and is 3500 kg in mass.
Frleftend=___N
Frrightend=___N

2007-10-11 19:30:17 · 2 answers · asked by Kiwi K 1