Sunday

October 26, 2014

October 26, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**PHYSICS**

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. (a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates. kV/m (b) What is the surface charge ...
*Monday, October 14, 2013 at 1:45pm*

**physics**

A football is thrown upward at a 30 degree angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
*Monday, October 14, 2013 at 1:30pm*

**physics**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F⃗ = −C1rv⃗ , where C1 is a constant. At time t = 0, a small ball of mass m is projected into a liquid so that it initially...
*Monday, October 14, 2013 at 1:12pm*

**physics **

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F⃗ = −C1rv⃗ , where C1 is a constant. At time t = 0, a small ball of mass m is projected into a liquid so that it initially...
*Monday, October 14, 2013 at 12:46pm*

**physics **

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F⃗ = −C1rv⃗ , where C1 is a constant. At time t = 0, a small ball of mass m is projected into a liquid so that it initially...
*Monday, October 14, 2013 at 12:46pm*

**physics**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F⃗ = −C1rv⃗ , where C1 is a constant. At time t = 0, a small ball of mass m is projected into a liquid so that it initially...
*Monday, October 14, 2013 at 11:48am*

**Physics**

a race car driver on a straight track starts the tryout from rest at t = 0 and x = 0. the car accelerates with an acceleration given by a(t) = 0.25t (m/s^2). how far eill the car travel in 12 secs?
*Monday, October 14, 2013 at 11:21am*

**physics**

A small bead of mass m is constrained to move along a frictionless track as shown. The track consists of a semicircular portion of radius R followed by a straight part. At the end of the straight portion there is a horizontal spring of spring constant k attached to a fixed ...
*Monday, October 14, 2013 at 8:51am*

**PHYSICS (HELP)**

A small bead of mass m is constrained to move along a frictionless track as shown. The track consists of a semicircular portion of radius R followed by a straight part. At the end of the straight portion there is a horizontal spring of spring constant k attached to a fixed ...
*Monday, October 14, 2013 at 7:50am*

**PHYSICS**

In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds the paper above the floor, measures the distance between the hole and the floor, and finally measures the length of the light's image on the ...
*Monday, October 14, 2013 at 7:33am*

**Physics**

A small bead of mass m is constrained to move along a frictionless track as shown. The track consists of a semicircular portion of radius R followed by a straight part. At the end of the straight portion there is a horizontal spring of spring constant k attached to a fixed ...
*Monday, October 14, 2013 at 4:29am*

**physics**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F⃗ = −C1rv⃗ , where C1 is a constant. At time t = 0, a small ball of mass m is projected into a liquid so that it initially...
*Monday, October 14, 2013 at 4:03am*

**physics**

A major-league pitcher can throw a baseball in excess of 46.2 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 18.9 m away from the point of release?
*Monday, October 14, 2013 at 2:23am*

**physics**

An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that a person inside is stuck to the wall and does not slide down when the floor drops away. The acceleration of gravity is 9.8 m/s2 .Given g = 9.8 m/s2, the coefficient μ...
*Monday, October 14, 2013 at 12:26am*

**physics**

Pete slides a crate up a ramp at an angle of 25◦ by exerting a 290 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is 0.28. How much work did Pete do when the crate was raised a vertical distance of 2.24 m? Answer in units of J
*Monday, October 14, 2013 at 12:25am*

**Physics**

A drag racer starts her car from rest and accelerates at 9.2 m/s2 for the entire distance of 631 m. How long did it take the car to travel this distance? Answer in units of s
*Sunday, October 13, 2013 at 11:47pm*

**Physics**

A cart loaded with bricks has a total mass of 25.4 kg and is pulled at constant speed by a rope. The rope is inclined at 30.6 ◦ above the horizontal and the cart moves 18.4 m on a horizontal ﬂoor. The coeﬃcient of kinetic friction between ground and cart is...
*Sunday, October 13, 2013 at 11:42pm*

**PHYSICS**

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. (a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates. kV/m (b) What is the surface charge ...
*Sunday, October 13, 2013 at 11:28pm*

**College Physics**

Tarzan swings on a vine from a cliff to rescue Jane, who is standing on the ground surrounded by snakes. His plan is to push off the cliff, grab Jane at the lowest point of his swing, and carry them both to the safety of a nearby tree (see figure). Tarzan's mass is 76.1 kg...
*Sunday, October 13, 2013 at 11:20pm*

**physics**

Mario, a hockey player, is skating due south at a speed of 5.4 m/s relative to the ice. A teammate passes the puck to him. The puck has a speed of 10.0 m/s and is moving in a direction of 27° west of south, relative to the ice. What are the magnitude and direction (...
*Sunday, October 13, 2013 at 10:51pm*

**physics**

The 850 kg piano is being pushed across the floor with an applied force of 283 N [forward] and a force of friction of 271 N [backwards]. If the normal force balances the force of gravity, draw a free body diagram for the piano.
*Sunday, October 13, 2013 at 10:15pm*

**physics**

Determine the force of gravity on an 850 kg piano.
*Sunday, October 13, 2013 at 10:13pm*

**physics**

Your town is installing a fountain in the main square. If the water is to rise 20 m above the fountain, how much pressure must the water have as it moves slowly toward the nozzle that sprays it up into the air? Assume atmospheric pressure equal to 100,000 Pa.
*Sunday, October 13, 2013 at 10:03pm*

**physics **

If you fill a container with air at room temperature (400 K), seal the container, and then heat the container to 500 K, what will the pressure be inside the container? Assume atmospheric pressure equal to 100,000 Pa.
*Sunday, October 13, 2013 at 10:02pm*

**Physics pls anyone can help me? its urgent**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F = -c_1*r*v , where c_1 is a constant. At time t = 0, a small ball of mass is projected into a liquid so that it initially has a horizontal ...
*Sunday, October 13, 2013 at 8:37pm*

**College Physics**

Although they don’t have mass, photons—traveling at the speed of light—have momentum. Space travel experts have thought of capitalizing on this fact by constructing solar sails—large sheets of material that would work by reflecting photons. Since the ...
*Sunday, October 13, 2013 at 8:21pm*

**physics**

A 660 kg car is being pushed along a flat parking lot at a constant speed of 1.52 m/s. The coefficient of friction between the road and the car is 0.31. What force is being used to push the car?
*Sunday, October 13, 2013 at 5:44pm*

**physics**

In the first 3.8 seconds of a bobsled run, the 57 kg sled is pushed until it reaches a speed of 1.1 m/s. The flat surface has a coefficient of friction of 0.06. What is the acceleration of the sled in this time? What constant force is exerted by the bobsled team?
*Sunday, October 13, 2013 at 5:32pm*

**Physics Urgent please help**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F = -c_1*r*v , where c_1 is a constant. At time t = 0, a small ball of mass is projected into a liquid so that it initially has a horizontal ...
*Sunday, October 13, 2013 at 5:28pm*

**College Physics**

The electron-volt, eV, is a unit of energy (1eV = 1.602 ·10–19 J, 1 MeV = 1.602 ·10–13 J). Since the unit of momentum is an energy unit divided by a velocity unit, nuclear physicists usually specify momenta of nuclei in units of MeV/c, where c is the ...
*Sunday, October 13, 2013 at 5:23pm*

**physics**

A ball is thrown downward from a window 16.5 m from the ground with a velocity of 3.6 m/s. What is the velocity of the ball the moment it hits the ground? Round your answer to 2 decimal places.
*Sunday, October 13, 2013 at 5:21pm*

**physics**

A ball is thrown downward from a window 16.5 m from the ground with a velocity of 3.6 m/s. What is the velocity of the ball the moment it hits the ground? Round your answer to 2 decimal places.
*Sunday, October 13, 2013 at 5:21pm*

**PHYSICS**

The roller coaster in the figure below starts with a velocity of 17 m/s. One of the riders is a small girl of mass 31 kg. Find her apparent weight when the roller coaster is at locations B and C. At these two locations, the track is circular, with the radii of curvature given ...
*Sunday, October 13, 2013 at 4:05pm*

**physics**

Over a certain region of space, the electric potential is V = 5x - 6x2y + 2yz2. Find the expression for the x component of the electric field over this region. (Use x, y, and z as necessary.) Find the expression for the y component of the electric field over this region. Find ...
*Sunday, October 13, 2013 at 4:04pm*

**Physics**

A cart of mass m1 = 12 kg slides down a frictionless ramp and is made to collide with a second cart of mass m2 = 21 kg, which then heads into a vertical loop of radius 0.26 m, but the carts stick together after the collision.Find the height h from which cart 1 would need to ...
*Sunday, October 13, 2013 at 3:37pm*

**Physics**

A cart of mass m1 = 12 kg slides down a frictionless ramp and is made to collide with a second cart of mass m2 = 19 kg, which then heads into a vertical loop of radius 0.23 m. Determine the height h from which cart 1 would need to start to make sure that cart 2 completes the ...
*Sunday, October 13, 2013 at 3:33pm*

**Physics**

A vintage sports car accelerates down a slope of θ = 16.6°. The driver notices that the strings of the fuzzy dice hanging from his rear-view mirror are perpendicular with respect to the roof of the car. What is the acceleration of the car?
*Sunday, October 13, 2013 at 3:31pm*

**Physics**

A certain orthodontist uses a wire brace to align a patient's crooked tooth as in the figure below. The tension in the wire is adjusted to have a magnitude of 12.40 N. Find the magnitude of the net force exerted by the wire on the crooked tooth.
*Sunday, October 13, 2013 at 2:48pm*

**Physics**

A 0.0122-kg bullet is fired straight up at a falling wooden block that has a mass of 2.17 kg. The bullet has a speed of 813 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the ...
*Sunday, October 13, 2013 at 2:27pm*

**physics**

In this problem, we will carry out some steps of the quantum factoring algorithm for N=91. (a) What is the period k of the periodic superposition set up by the quantum factoring algorithm if it chooses x=8? I.e. what is the period of f(j)=8j(mod91) (b) Using your answer to (a...
*Sunday, October 13, 2013 at 11:55am*

**physics**

Suppose we ran m steps of Grover's algorithm on some function f (which has one marked element y) and the resulting superposition was exactly |y⟩. If we run for m+1 additional steps (i.e. total of 2m+1 steps from the initial state), what is the resulting ...
*Sunday, October 13, 2013 at 11:52am*

**physics**

Consider the Hamiltonian H=Z⊗3 acting on 3 qubits. What is the ground energy of the system? (I.e. the lowest eigenvalue of H?) What is the dimension of the ground energy subspace? (I.e. multiplicity of that eigenvalue?)
*Sunday, October 13, 2013 at 11:51am*

**physics**

A glass plate whose index of refraction is 1.67 is immersed in a liquid. The surface of the glass is inclined at an angle of 29.0° with the vertical. A horizontal ray in the glass is incident on the interface. When the liquid is a certain alcohol, the incident ray arrives ...
*Sunday, October 13, 2013 at 9:00am*

**Physics**

A boat propelled so as to travel with a speed of 0.5m/s in still water, moves directly (in a straight line) across a river that is 60m wide. The river flows with a speed of 0.30m/s. How long in seconds does it take the boat to cross the river?
*Sunday, October 13, 2013 at 3:32am*

**physics**

Five equal negative point charges -q are placed symmetrically around a circle of radius R. Calculate the electric potential at the center of the circle. Note: Assume a reference level of potential V = 0 at r = ∞.
*Sunday, October 13, 2013 at 2:23am*

**physics**

(a) Find the potential at a distance of 0.920 cm from a proton. (Note: Assume a reference level of potential V = 0 at r = ∞.) V (b) What is the potential difference between two points that are 0.920 cm and 2.00 cm from a proton? V (c) Repeat parts (a) and (b) for an ...
*Sunday, October 13, 2013 at 2:23am*

**Physics -URGENT-**

A 2 kg mass accelerates at 5.7 m/s 2 in a direction 19◦ north of east. One of the two forces acting on the mass has a magnitude of 17.1 N and is directed north. Determine the magnitude of the second force. Answer in units of N
*Sunday, October 13, 2013 at 1:21am*

**physics**

Calculate the speed of an electron that is accelerated through the potential difference of 123 V.
*Saturday, October 12, 2013 at 11:59pm*

**physics**

An electron moving parallel to the x axis has an initial speed of 3.66 ✕ 106 m/s at the origin. Its speed is reduced to 1.40 ✕ 105 m/s at the point x = 2.00 cm. Calculate the potential difference between the origin and that point. ΔV =
*Saturday, October 12, 2013 at 11:57pm*

**Physics**

A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
*Saturday, October 12, 2013 at 11:39pm*

**Physics**

A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
*Saturday, October 12, 2013 at 11:39pm*

**Physics**

A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
*Saturday, October 12, 2013 at 11:38pm*

**physics **

A. A particle is traveling without friction up and down hills and valleys. If its initial potential energy is 6 J and its initial kinetic energy is 78 J, what is its total energy, E? E: J B. If at a later point its potential energy is -14 J, what is its kinetic energy K at ...
*Saturday, October 12, 2013 at 11:12pm*

**Quantum Physics**

We will carry out some steps of the quantum factoring algorithm for N=91 (a) What is the period k of the periodic superposition set up by the quantum factoring algorithm if it chooses x=8? I.e. what is the period of f(j)=8j(mod91) (b) Using your answer to (a), find a ...
*Saturday, October 12, 2013 at 10:36pm*

**Quantum Physics**

Suppose you are given an endless supply of qubits in the state 12√|00⟩+eiϕ2√|10⟩. To estimate the phase angle ϕ, you run Fourier sampling (i.e. Hadamard on each qubit followed by a standard basis measurement) on this state repeatedly...
*Saturday, October 12, 2013 at 10:35pm*

**Quantum Physics**

Suppose you are given an endless supply of qubits in the state (1/√2)|00>+(e^iϕ/√2)|10>. To estimate the phase angle ϕ, you run Fourier sampling (i.e. Hadamard on each qubit followed by a standard basis measurement) on this state repeatedly. ...
*Saturday, October 12, 2013 at 8:24pm*

**physics**

a javelin thrower wished to obtain a record of throwing 100 m on a flat level ground. if he hurls the javelin at 45 degrees from the horizontal, what initial speed must the javelin have?
*Saturday, October 12, 2013 at 7:02pm*

**physics**

An oil drop ‘B’ has charge 1.6 × 10−19 C and mass 1.6 × 10−14 kg. If the drop is in equilibrium position, let 10 k be the potential diff. between the plates. [The distance between the plates is 100 mm] Then what is the value of k.
*Saturday, October 12, 2013 at 4:27pm*

**physics**

for the hydrulic lift shown,what must be the radio of the diameter of the vessel at the car to the diameter of the vessel where the force F,is applied so that a 1.52x10^3 gr car can be lifted with a force F,of just 0.125kN?
*Saturday, October 12, 2013 at 12:26pm*

**physics**

If you accelerate due to gravity (free fall), your acceleration is -9.8 m/s2. In some fields, particularly aviation, this is referred to as 1 g of acceleration. If you were accelerating at 2.5 g, what would be your average acceleration? If you started from rest, what would be ...
*Saturday, October 12, 2013 at 12:21pm*

**Physics**

can someone help i'm stuck on two questions??? 23. On a velocity-time graph, when is the object not moving? when the slope is a straight line rising to the right when the slope is a straight line falling to the right when the slope is a line curving upward to the right at ...
*Saturday, October 12, 2013 at 10:21am*

**Physics**

While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 61-kg person develops a power of 75 W during a race, how fast is the person running?
*Saturday, October 12, 2013 at 10:00am*

**Physics-Help Please!**

a 25gram bullet is fired upward through a .36kg block. the block goes up 17cm in the air and the bullet goes up 24m into the air. What is the initial velocity of the bullet?
*Saturday, October 12, 2013 at 9:25am*

**Physics Urgent please help**

Consider an ideal spring that has an unstretched length l_0 = 3.5 m. Assume the spring has a constant k = 36 N/m. Suppose the spring is attached to a mass m = 8 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x_0 = 1.9 m ...
*Saturday, October 12, 2013 at 4:11am*

**physics**

The mass of an unloaded car is 800 kg. The body of the car will sink 6 cm after getting in 5 persons of total mass of 500 kg. How much is the time of period of vibration of the unloaded car and loaded with passengers?
*Saturday, October 12, 2013 at 2:19am*

**Physics**

A charge of 1nC is added to a spherical soap bubble with a radius of 3.0cm. What is the electric field strength just outside of the bubble? What is the electric field strength just inside of the bubble? The field experienced by each charge in the skin of the bubble is the ...
*Friday, October 11, 2013 at 11:48pm*

**physics**

A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 20.0 m. She pushes in a direction 28.0° below the horizontal. A 54.0-N frictional force opposes the motion of the cart.
*Friday, October 11, 2013 at 9:53pm*

**physics**

In an automatic clothes dryer, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.36 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an angle of è ...
*Friday, October 11, 2013 at 9:25pm*

**physics**

Judy, by chance, spots a potted plant falling outside the window at 3.14 m/s.Further down the same building, Judy’s boyfriend clocks the pot at 53 m/s.How far apart are the friends? The acceleration of gravity is 9.8m/s2.
*Friday, October 11, 2013 at 9:20pm*

**physics**

Pilots of high-performance fighter planes can be subjected to large centripetal accelerations during high-speed turns. Because of these accelerations, the pilots are subjected to forces that can be much greater than their body weight, leading to an accumulation of blood in the...
*Friday, October 11, 2013 at 9:10pm*

**Physics**

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to six times her weight as she goes through the dip. If r = 22.0 m, how fast is the roller coaster ...
*Friday, October 11, 2013 at 9:00pm*

**Physics**

The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground is 0.94, determine ...
*Friday, October 11, 2013 at 5:06pm*

**physics**

The drawing shows a wire tooth brace used by orthodontists. The topmost tooth is protruding slightly, and the tension in the wire exerts two forces vector T and vector T ' on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 24.0...
*Friday, October 11, 2013 at 4:53pm*

**Physics**

The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 59000 N. The lift force vector L generated by the rotating blade makes an angle of 21.0° with respect to the vertical.
*Friday, October 11, 2013 at 4:45pm*

**physics**

A boat of mass 120 kg floats in a stream. You push on the boat with a pole, exerting a force of (175 i hat - 145 j hat) N. The boat moves through a displacement dvec = (23.0 i hat - 8.0 j hat) m along a straight line.
*Friday, October 11, 2013 at 4:43pm*

**Physics**

If the visible part of an ice berg is 50mx50m in area and 20m is above the surface, what is the height, h? I tried using FB=FG but I don't get anywhere. Can anyone help me out?
*Friday, October 11, 2013 at 3:57pm*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
*Friday, October 11, 2013 at 3:34pm*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
*Friday, October 11, 2013 at 3:32pm*

**Physics**

A small bead of mass m is constrained to move along a frictionless track as shown. The track consists of a semicircular portion of radius R followed by a straight part. At the end of the straight portion there is a horizontal spring of spring constant k attached to a fixed ...
*Friday, October 11, 2013 at 3:31pm*

**physics**

In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 42 m/s (around 90 mi/h) in a time of 7.3 s. The mass of the car and riders is 5700 kg. Find the average net force exerted on the car and riders by the ...
*Friday, October 11, 2013 at 2:51pm*

**physics**

It is important to be as far away from the cliff as possible before opening the parachute. How far from the cliff is this jumper when she opens her chute?
*Friday, October 11, 2013 at 2:27pm*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N?
*Friday, October 11, 2013 at 1:41pm*

**motion,physics**

Model rockets are lightweight rockets powered by very small engines. A typical model rocket has a mass of 5g.Similarly, a typical "class C" model rocket engine can produce a total impulse of 10 Newton-seconds. We usually launch model rockets vertically, but if I ...
*Friday, October 11, 2013 at 10:55am*

**physics**

An elevator in a tall building is allowed to reach a maximum speed of 3.61 m/s going down. What must the tension be in the cable to stop this elevator over a duration of 3 seconds if the elevator has a mass of 1370 kg including occupants?
*Friday, October 11, 2013 at 10:43am*

**physics**

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...
*Friday, October 11, 2013 at 9:46am*

**Physics**

A 2.5 kg block sits on an inclined plane with a 30 degree inclination. A light cord attached to the block passes up over a light frictionless pulley at the top of the plane and is tied to a second 2.5 kg mass freely hanging vertically. The coefficients of static and kinetic ...
*Friday, October 11, 2013 at 8:13am*

**PHYSICS**

Model rockets are lightweight rockets powered by very small engines. A typical model rocket has a mass of 5g.Similarly, a typical "class C" model rocket engine can produce a total impulse of 10 Newton-seconds. We usually launch model rockets vertically, but if I ...
*Friday, October 11, 2013 at 7:56am*

**physics**

what are imp. long questions of 7th chapter of 9 e.m of physics of bise lahore.
*Friday, October 11, 2013 at 7:39am*

**Physics**

a safety harness is connected to a cable with a report breaking stress of 800MNm2. what mass could be hung from a harness if the diameter of the cable was 6mm. how do I work this out?
*Friday, October 11, 2013 at 5:23am*

**physics**

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...
*Friday, October 11, 2013 at 4:40am*

**Physics**

I really don't get why I am getting this question wrong? Please can you explain to me how to do this question step by step so that I can understand it please? :( i have been stuck on this question for quite a while now. Determine the stopping distances for an automobile ...
*Friday, October 11, 2013 at 3:45am*

**Physics**

I really don't get why I am getting this question wrong? Please can you explain to me how to do this question step by step so that I can understand it please? :( i have been stuck on this question for quite a while now. Determine the stopping distances for an automobile ...
*Friday, October 11, 2013 at 3:04am*

**Physics**

I really don't get why I am getting this question wrong? Please can you explain to me how to do this question step by step so that I can understand it please? :( i have been stuck on this question for quite a while now. Determine the stopping distances for an automobile ...
*Friday, October 11, 2013 at 2:49am*

**Physics**

I really don't get why I am getting this question wrong? Please can you explain to me how to do this question step by step so that I can understand it please? :( i have been stuck on this question for quite a while now. Determine the stopping distances for an automobile ...
*Friday, October 11, 2013 at 2:36am*

**physics**

For a scene in a movie, a stunt driver drives a 1.50×10^3kg SUV with a length of 4.00m around a circular curve with a radius of curvature of 0.333 km. The vehicle is to be driven off the edge of a gully 10.0 m wide, and land on the other side 2.96 m below the initial ...
*Friday, October 11, 2013 at 12:58am*

**physics**

a train goes into a tunnel at 20m/s and emerges from itat 55m/s. the tunnel is 1500m long.assuming constant acceleration the time for which the train moves in tunnel is
*Friday, October 11, 2013 at 12:55am*

**PHYSICS!!**

I've tried this problem again and again using conservation of momentum and energy but I am not having any luck: A ball of mass 0.300kg that is moving with a speed of 8.0m/s collides head-on and elastically with another ball initially at rest. Immediately after the ...
*Friday, October 11, 2013 at 12:06am*

**Physics**

You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. The soccer ball is kicked at 41° from the edge of the building with an initial velocity of 21 m/s and lands 59 meters away from the wall. How tall is the ...
*Thursday, October 10, 2013 at 11:50pm*

**AP physics c**

A helicopter lifts a 63 kg astronaut 10 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? Incorrect: Your answer is incorrect. J (b) How much work is done on ...
*Thursday, October 10, 2013 at 10:38pm*

**physics**

Suzie (of mass 76 kg) is roller-blading down the sidewalk going 12 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 1.9 seconds. What is Suzie’s average acceleration
*Thursday, October 10, 2013 at 10:12pm*

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