Friday

November 21, 2014

November 21, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

with a cart of unknown mass, could you still determine whether its total energy is conserved? explain your reasoning
*Tuesday, November 18, 2014 at 5:10pm*

**physics 9th grade **

What is the impulse that must be applied to stop a 90-kilogram running back on a field at a speed of 4.5 meters per second. (Hint:remember the relationship of impulse and change in momentum)
*Tuesday, November 18, 2014 at 4:54pm*

**physics**

Chapter 18, Problem 13 Two point charges are fixed on the y axis: a negative point charge q1 = -26 μC at y1 = +0.17 m and a positive point charge q2 at y2 = +0.35 m. A third point charge q = +9.5 μC is fixed at the origin. The net electrostatic force exerted on the ...
*Tuesday, November 18, 2014 at 4:32pm*

**physics**

Background pertinent to this problem is available in Interactive LearningWare 18.3. A uniform electric field exists everywhere in the x, y plane. This electric field has a magnitude of 5700 N/C and is directed in the positive x direction. A point charge -5.4 × 10-9 C is ...
*Tuesday, November 18, 2014 at 4:31pm*

**physics**

A 2-kilogram ball is accelerated from rest to a speed of 8 m/sec. What is the ball`s change in momentum? Looking for? Given? Relationship?(formula) Solution?
*Tuesday, November 18, 2014 at 3:47pm*

**Physics**

A 8.34kg lump of clay travels east on frictionless ice at a speed of 2.40 m/s. A .170 kg hockey puck travels northward and collides with the clay. After the collision, both objects stick together, and move off at a speed of 2.59 m/s in a direction of 23.9* north of east. What ...
*Tuesday, November 18, 2014 at 3:47pm*

**physics**

An Olympic diver falls from rest from the platform 10m high. At what velocity does the diver hit the water is acceleration in 9.8m/s^2. Do I assume "rest" means a initial velocity of 0? Could the formula be: d= (vf^2-vi^2)/2(a) ? as in d=10, a=9.8 vi=0 vf = √(d...
*Tuesday, November 18, 2014 at 3:28pm*

**physics**

Jake's momentum is 100kg*m/sec when he walks at 2 m/sec. What is his mass?
*Tuesday, November 18, 2014 at 3:26pm*

**Physics**

A glass block has a refractive index of 1.49. What is the critical angle for the block?
*Tuesday, November 18, 2014 at 1:22pm*

**physics**

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 301 K receives 67.9 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
*Tuesday, November 18, 2014 at 1:17pm*

**physics**

The R-factor for housing insulation gives the thermal resistance in units of ft2 °F h/BTU. A good wall for harsh climates, corresponding to about 10 in of fiberglass, has R = 39 ft2 °F h/BTU. a) Determine the thermal resistance (in m2 K/W) in SI units. Yanlýþ...
*Tuesday, November 18, 2014 at 1:16pm*

**Physics **

A piece of red glass is heated till it glows in dark.the colour of glowing glass would be?
*Tuesday, November 18, 2014 at 9:58am*

**Physics**

A red flower seen in the light of mercury vapour lamp through a green filter will appear?
*Tuesday, November 18, 2014 at 9:55am*

**physics**

A red flower seen in the light of mercury vapour lamp through a green filter wil appear in what colour?
*Tuesday, November 18, 2014 at 9:36am*

**physics**

Nd/Na = -V.g.hd(beta-beta1)/KT NdNa: No of particules(mole) V: Volume g: gravitational acceleration hd: distance beta: densities(mass/volume) k: Boltzman constant (joules/kelvin) T: absolute temperature(kelvin) volume = L3 gravitational acceleration L/T2 1joule = 1kgm2/S2
*Tuesday, November 18, 2014 at 9:02am*

**Physics**

A 0.50 kg ball is moving with a velocity of 8.0 m/s along a horizontal floor. It hits another ball with a mass of 0.80 kg and moving at 10.0 m/s in the opposite direction. If the first ball bounces back with a velocity of 12 m/s, with what velocity and in what direction will ...
*Tuesday, November 18, 2014 at 7:07am*

**physics**

In an experiment to verify Newton's law of cooling, the temperature of hot water in a calorimeter T/oC is plotted against time t/min. Which of the following is true about the graph? a. the graph is linear and parallel to the T-axis b. the slope of the graph is positive c. ...
*Tuesday, November 18, 2014 at 6:19am*

**physics**

a block is pushed up against the wall. Let the mass of the block be m = 2.8 kg, the coefficient of kinetic friction between the block and the wall be µ = 0.56, and θ = 61◦ . Suppose F = 73 N. The acceleration of gravity is 9.8 m/s 2 Find the force of friction...
*Tuesday, November 18, 2014 at 12:04am*

**physics**

In a house the temperature at the surface of a window is 20.1 °C. The temperature outside at the window surface is 2.72 °C. Heat is lost through the window via conduction, and the heat lost per second has a certain value. The temperature outside begins to fall, while ...
*Monday, November 17, 2014 at 11:09pm*

**physics**

A copper pipe with an outer radius of 0.010 m runs from an outdoor wall faucet into the interior of a house. The temperature of the faucet is 3.3°C, and the temperature of the pipe, 3.0 m from the faucet, is 25°C. In fifteen minutes, the pipe conducts a total of 270 J ...
*Monday, November 17, 2014 at 11:00pm*

**physics**

An express subway train passes through an underground station. It enters at t = 0 with an initial velocity of 23.5 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. The station in 215 m long. (a) How long is the nose of the train in the station? (b) How fast is ...
*Monday, November 17, 2014 at 10:19pm*

**physics**

Save Two children hang by their hands from the same tree branch. The branch is straight, and grows from the tree trunk at an angle of 27 degrees above the horizontal. One child, with a mass of 39 kg is hanging 1.50 m along the branch from the tree trunk. The other child, with...
*Monday, November 17, 2014 at 9:12pm*

**Physics**

A motor pushes a boat through the water with the force of 2100 N; the water creates a resistance force of 1800 N. What is the acceleration of 1200 kg boat? (Do I use force equals mass times acceleration? 2100=1200a) If it starts from rest how far will it move in 10 seconds? (...
*Monday, November 17, 2014 at 8:33pm*

**physics**

Find the force (in newton) required to lift a mass of 26 kg load with a wheelbarrow (2nd class lever) with the load at 0.75 m from the fulcrum and being lifted at 1.7 m from the fulcrum, assuming ideal conditions.
*Monday, November 17, 2014 at 8:15pm*

**Physics**

A woman is swimming when she hears the underwater sound wave from an exploding ship across the harbor. She immediately lifts her head out of the water. The sound wave from the explosion propagating through the air reaches her 4.00 s later. How far away is the ship? Assume that...
*Monday, November 17, 2014 at 7:01pm*

**Physics**

A woman is swimming when she hears the underwater sound wave from an exploding ship across the harbor. She immediately lifts her head out of the water. The sound wave from the explosion propagating through the air reaches her 4.00 s later. How far away is the ship? Assume that...
*Monday, November 17, 2014 at 6:00pm*

**physics**

A railway flat car is rushing along a level frictionless track at a speed of 45m/s. Mounted on the car and aimed forward is a cannon that fires 65 kg cannon balls with a muzzle speed of 625m/s. The total mass of the car, the cannon, and the large supply of cannon balls on the ...
*Monday, November 17, 2014 at 5:39pm*

**Chemistry Physics**

How many Btu of heat are required to melt 33.0 lb of ice at 32°F and to raise the temperature of the melted ice to 72°F?
*Monday, November 17, 2014 at 5:36pm*

**College Physics**

A 1.45kg mass oscillates according to the equation x=0.650cos8.10t, where x is in meters and t is in seconds.Determine the amplitude, frequency, total energy, and the potential and kinetic energy at x=0.370
*Monday, November 17, 2014 at 3:02pm*

**physics**

A point mass m starts from rest and slides down the surface of a frictionless solid sphere of radius r. Find the angle at which the mass flies off the sphere
*Monday, November 17, 2014 at 1:05pm*

**physics**

A circus performer decides to take his human cannonball act to the extreme. After being shot from a cannon, he soars over three ferris wheels and into a net. Assume that he is launched with a speed of 26.5m/s at an angle of 53.0 degrees, what angle does he make with the ...
*Monday, November 17, 2014 at 12:47pm*

**Physics**

a backpack has a massof 8kg.it is lifted and given 54.9 joules of gravitstional potential energy. how high is it lifted? accelerationdue to gravity is g=98 m/s^2.
*Monday, November 17, 2014 at 12:33pm*

**Physics **

AN astronaut on the Moon has a mass (including his spacesuit and equipment) of 180 kg. the acceleration due to gravity on the Moon is 1.6 m/s2 (seconds squared). a) calculate his weight on the moon. the astronaut climbs 100m to the top of the crater . b) by how much does his ...
*Monday, November 17, 2014 at 10:43am*

**physics**

Objects of masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.48. The object m1 is held at rest on the floor, and m2 rests on a fixed incline of θ = 36.0°. The objects are released from rest, and...
*Sunday, November 16, 2014 at 11:41pm*

**physics**

A solid disk rotates in the horizontal plane at an angular velocity of 0.040 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.13 kg·m2. From above, sand is dropped straight down onto this rotating disk, so ...
*Sunday, November 16, 2014 at 11:16pm*

**Physics**

For the situation: "A moving crate slides to a halt on a rough surface" Does temperature increase, decrease, or not change? Are work and heat positive, negative, or zero? Does thermal energy increase, decrease, or not change? My answer key says temperature increases...
*Sunday, November 16, 2014 at 11:03pm*

**Thank Jiskha tutors**

I really appreciate all that you tutors do for us, I know we may be a bit demanding sometimes XD but we really love how you guys are always there to help us out. Coming from experience, I've had some past teachers that aren't as willing to help us when we do not ...
*Sunday, November 16, 2014 at 9:37pm*

**physics**

What is the kinetic energy in MeV of a π–meson that lives 1.80×10-16 s as measured in the laboratory, and 0.840×10-16 s when at rest relative to an observer, given that its rest energy is 135 MeV?
*Sunday, November 16, 2014 at 9:28pm*

**physics**

To create artificial gravity, the space station is rotating at a rate of 0.80 rpm. The radii of the cylindrically shaped chambers have the ratio rA/rB = 3.80. Each chamber A simulates an acceleration due to gravity of 10.0 m/s2.
*Sunday, November 16, 2014 at 9:09pm*

**Physics**

A 1200 kg car pulls an 820 kg trailer over a rough road. The force of friction acting on the trailer is 650 N [backwards]. Calculate the force that the car exerts on the trailer if (a) the trailer is moving at a constant velocity of 30 km/h [forward] (b) the trailer is moving ...
*Sunday, November 16, 2014 at 8:59pm*

**physics**

Suppose we wish to use a 4.0 m iron bar to lift a heavy object by using it as a lever. If we place the pivot point at a distance of 0.5 m from the end of the bar that is in contact with the load and we can exert a downward force of 640 N on the other end of the bar, find the ...
*Sunday, November 16, 2014 at 8:45pm*

**physics **

A 70.3-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.07 x 10-2 m3 and is completely submerged under the water. The volume of the person's body that is underwater is 6.49 x 10-2 m3. What is the density of the life jacket?
*Sunday, November 16, 2014 at 7:59pm*

**Physics question**

What are some examples of vector calculations in travel in the real world. I can't really think of some that have to go with travel. I can see how vector calculations could happen in sports..But I cant really see how in travel. Can you help me?
*Sunday, November 16, 2014 at 7:48pm*

**physics**

A ball with radius 12cm rolls on a level surface, and the translational speed of the center of mass is 0.35 m/s. What is the angular speed about the center of mass if the ball rolls without slipping?
*Sunday, November 16, 2014 at 7:45pm*

**Physics**

A 25 kg box is being pulled across a surface. The coefficient of kinetic friction between the box and the surface is 0.55. a) if the box is moving at a constant speed, what is the pulling force? b)If the pulling force is 350 N, what is the NET force acting on the box? c)If the...
*Sunday, November 16, 2014 at 7:10pm*

**physics**

a 7 kg ball is thrown into the air from ground level with an initial velocity of 24m/s. Determine the ball's maximum height. Use conservation of energy. help!!!
*Sunday, November 16, 2014 at 7:09pm*

**Physics**

A ball is thrown horizontally from the top of a building 45.9 m high. The ball strikes the ground at a point 121 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the initial velocity of ...
*Sunday, November 16, 2014 at 6:40pm*

**physics grade 11**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Sunday, November 16, 2014 at 5:22pm*

**physics**

A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 22.7 m/s. At the same time, it has a horizontal velocity of 58.9 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s At what angle with the ...
*Sunday, November 16, 2014 at 5:03pm*

**Physics**

A brick of mass 2.3 kg is lifted to a height of 1.9 m. How much gravitational potential energy is added to the brick? Acceleration due to gravity is g = 9.8 m/s2.
*Sunday, November 16, 2014 at 4:58pm*

**Physics**

What is the kinetic energy in MeV of a π–meson that lives 1.80×10-16 s as measured in the laboratory, and 0.840×10-16 s when at rest relative to an observer, given that its rest energy is 135 MeV?
*Sunday, November 16, 2014 at 4:43pm*

**physics**

An air puck of mass 0.278 kg is tied to a string and allowed to revolve in a circle of radius 1.25 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 0.45 kg is tied to it. The suspended mass ...
*Sunday, November 16, 2014 at 1:48pm*

**physics**

A roller coaster cart of mass m = 201 kg starts stationary at point A, where h1 = 27.7 m and a while later is at B, where h2 = 7.1 m. The acceleration of gravity is 9.8 m/s 2. What is the potential energy of the cart relative to the ground at A? Answer in units of J. (201*27.7...
*Sunday, November 16, 2014 at 1:44pm*

**physics**

A basketball player shoots the ball from a height of 2.22 m above the floor at a horizontal distance of 1 m from the basket which is 3.05 m above the floor. If she shoots the ball at an angle of 42° above the horizontal, what initial speed must she throw the basketball so ...
*Sunday, November 16, 2014 at 11:50am*

**physics**

You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around the same coil have to ...
*Sunday, November 16, 2014 at 11:12am*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Sunday, November 16, 2014 at 11:05am*

**Physics**

The pistons of a hydraulic press have radii of 2.00cm and 12.00cm, respectively. A) What force must be applied to the smaller piston to exert a force of 5250N on the larger piston? B) What is the pressure in (N/cm2) on each piston? C) What is the mechanical advantage of the ...
*Sunday, November 16, 2014 at 10:53am*

**Physics**

You have a tanker that is filled with olive oil, which total mass = 200 kg. The tanker is in the shape of a rectangular box w/vertical sides and a horizontal cross-sectional area 0.9 m^2. How deep a swimming pool do you need so that the tanker doesn't hit the bottom?
*Sunday, November 16, 2014 at 12:53am*

**physics**

On the moon, the acceleration due to gravity is only 1.6 m/s/s. If someone on earth can throw a baseball 24.2 m high, how high could he throw it on the moon?
*Saturday, November 15, 2014 at 11:34pm*

**physics**

A straight horizontal wire carries a current of 3.55 μA. A proton is moving above the wire in a direction parallel to it but opposite to the direction of the conventional current in the wire, at a constant velocity of 8.00×106 m/s. Assume that the force of gravity ...
*Saturday, November 15, 2014 at 10:08pm*

**Physics**

an airplaine is flying at constant speed of 500 km/h on a straight line at 33000 feet above sea level. what is the net force acting on the airplane?
*Saturday, November 15, 2014 at 7:27pm*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Saturday, November 15, 2014 at 5:34pm*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Saturday, November 15, 2014 at 5:33pm*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Saturday, November 15, 2014 at 5:29pm*

**Physics**

A copper wire that has been heated to 520 degrees Celsius for pliability is plunged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire
*Saturday, November 15, 2014 at 2:56pm*

**Physics **

If the speed of the wave is 330 per sec calculate the wavelength
*Saturday, November 15, 2014 at 1:40pm*

**Physics**

How do i calculate (a) Ep of 1100,310m (b)then calculate the Ep when it is 50m above not 310m
*Saturday, November 15, 2014 at 1:38pm*

**Physics**

Your teacher placed a 4.5 kg block at the position marked with a “ +” (horizontally, 0.5 m from the origin) on a large incline outlined on the graph below and let it slide, starting from rest. Find the horizontal distance from the bottom (right-hand) edge of the ...
*Saturday, November 15, 2014 at 1:28pm*

**Physics**

A copper wire that has been heated to 520 degrees Celsius for pliability is plunnged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire
*Saturday, November 15, 2014 at 1:24pm*

**Physics**

A 1.50 X 10^2g piece of brass(specific heat capacity 3.80 X 10^2 J(kgC) is submerged in 400 mL of water at 27.7 Degrees Celsius. What is the original temperature of the brass if the mixture has a temperature of 28.0 degrees Celsius
*Saturday, November 15, 2014 at 1:22pm*

**physics**

In the figure, a 4.3 kg block is accelerated from rest by a compressed spring of spring constant 660 N/m. The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction μk = 0.260. The ...
*Saturday, November 15, 2014 at 1:03pm*

**physics**

A 50.0 g sample of lead starts at 22 degrees Celsius and is heated until it absorbs 8.7 X 10^2 of energy. Find the final temperature of the lead
*Saturday, November 15, 2014 at 12:05pm*

**physics**

What is the velocity of a car that move 5 metre in 5 seconds
*Saturday, November 15, 2014 at 11:29am*

**Physics**

The speed of a transverse wave on a stretched string can be changed by adjusting the tension of the string. A stationary wave pattern is set up on a stretched string using an oscillator set at a frequency of 650 Hz. How must the wave be changed to maintain the same stationary ...
*Friday, November 14, 2014 at 11:20pm*

**Physics**

A force, F = (6x̂ + 7y hat) N, is applied to an object at a point whose position vector with respect to the pivot point is r = (7x̂ + 7y hat + 7ẑ) m. Calculate the torque created by the force about that pivot point.
*Friday, November 14, 2014 at 11:14pm*

**Physics**

Determine the moment of inertia for three children weighing 64.0 lb, 44.0 lb and 83 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft.
*Friday, November 14, 2014 at 11:14pm*

**physics**

consider the 666 N weight held by two cables shown below. The left hand cable and tension 530 N and makes an angle of theta2 with the ceiling. The right hand cable had tension 390 N and makes an angle of theta1 with the ceiling. What is the angle theta1 which the right hand ...
*Friday, November 14, 2014 at 8:24pm*

**physics **

A 50.0 g sample of lead starts at 22 degrees Celsius and is heated until it absorbs 8.7 X 10^2 of energy. Find the final temperature of the lead
*Friday, November 14, 2014 at 8:11pm*

**physics**

A child pulls a 13 kg sled across the snow at a constant 1.6 m/s [N] applying a force of 51 N [N 25 deg U]. How much work have they done after pulling for 44 m? Round answers to the nearest whole number. m=13kg Vcon=1.6m/s F=51N d=44 cos theta=25 W=Fdcostheta? I don't know...
*Friday, November 14, 2014 at 5:11pm*

**Physics**

The graph shows the temperature versus time relationship for 2kg of particular substance. The substance is in the solid state at a temperature of 20 degrees Celsius b) If 200 joules of heat is added during the time interval B(20 degrees Celsius) to C(80 degrees Celsius), what ...
*Friday, November 14, 2014 at 5:01pm*

**physics**

135.2 J of heat energy are transferred to 24.75 g of mercury. By how much does the temperature increase? (in K) Specific heat of the mercury is 140 J/kg·°C. How much heat is needed to raise the temperature of 24.75 g of water by the same amount? Specific heat of the...
*Friday, November 14, 2014 at 4:45pm*

**Physics**

The graph shows the temperature versus time relationship for 2 kg of particular substance. The substance is in the solid state at a room temperature of 20 degrees Celsius. - The 100 joules of heat is needed to completely change the substance from a solid to a liquid state, ...
*Friday, November 14, 2014 at 3:59pm*

**physics**

using 6400 km as the radius of earth, calculate how high above earth's surface you would have to be in order to weigh 1/16th of your current weight.
*Friday, November 14, 2014 at 3:07pm*

**PHYSICS (please help)**

Three masses are connected by a string. M1 = 1.0kg M2 = 2.0kg M3 = 3.0kg Mass one and two are on a table while mass three hangs off the edge of the table (there is a pulley). Find the tension in the string connecting m1 and m2. Assume the table is frictionless and the masses ...
*Friday, November 14, 2014 at 12:34pm*

**physics**

a boom 4.7 meters,10000 kg, 20 degree angle, find torqe on the pivot i fond force=10000x9.81= 98100 N perpindiclar force = 33552 N torqe = 4.7x33552 = 167695 Nm i am told this is wrong
*Friday, November 14, 2014 at 11:49am*

**physics **

How much heat must be added to 20 grams of water at 100 degrees Celsius to convert it to steam? My work Q = (20)(4.18 x 10^3)(100) = 8360000 J Is that the correct answer?
*Friday, November 14, 2014 at 11:31am*

**physics **

216J if energy is required to raise the temperature of aluminium from 15 degrees Celsius to 35 degrees Celsius. Calculate the mass of the aluminium. My work I keep getting 0.012 but it is not right I know the formula is Q= m x C x T
*Friday, November 14, 2014 at 10:55am*

**PHYSICS**

A 75 kg window cleaner uses a 10 kg ladder that is 7.2 m long. He places one end on the ground 4.5 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 5.2 m up along the ladder when the window breaks. Neglect friction between the ladder ...
*Friday, November 14, 2014 at 10:16am*

**Physics**

A 75 kg window cleaner uses a 10 kg ladder that is 7.2 m long. He places one end on the ground 4.5 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 5.2 m up along the ladder when the window breaks. Neglect friction between the ladder ...
*Friday, November 14, 2014 at 10:13am*

**physics**

Calculate the potential energy of a 9.00 g bullet traveling 4.00 m above the ground at 50.0 m/s with respect to the ground
*Friday, November 14, 2014 at 9:23am*

**Physics**

A 1180 kg car rounds a circular turn of radius 19.1 m. If the road is flat and the coefficient of static friction between the tires and the road is 0.67, how fast can the car go without skidding? m/s
*Friday, November 14, 2014 at 9:04am*

**Physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 8.2 m long. His speed at the bottom of the swing is 7.2 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have ...
*Friday, November 14, 2014 at 8:45am*

**physics**

a 6.3 kg watermelon is placed at one end of a 7.6 m, 201 n scaffolding supported by two cables. one supporting cable is at the opposite end of the scaffolding, and the other is 1.1 m from the watermelon
*Friday, November 14, 2014 at 2:15am*

**Physics**

The two masses (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in the figure are released from rest, with m1 at a height of 0.91 m above the floor. When m1 hits the ground its speed is 1.0 m/s. Assume that the pulley is a uniform disk with a radius of 12 cm. ...
*Friday, November 14, 2014 at 1:56am*

**physics**

A piece of putty of mass m = 0.75 kg and velocity v = 2.5 m/s moves on a horizontal frictionless surface. It collides with and sticks to a rod of mass M = 2 kg and length L = 0.9 m which pivots about a fixed vertical axis at the opposite end of the rod as shown. What fration ...
*Friday, November 14, 2014 at 1:43am*

**Physics**

Mary if riding her bike at a constant velocity of 10.2m/s. Suddenly someone jumps in front of her, 6 meters ahead of her. The coefficient of friction is 0.35, and her total mass is 130kg. She slams the breaks with 800N of force. Will she be able to stop in time? I heard that ...
*Thursday, November 13, 2014 at 11:27pm*

**Physics**

A force of 12.7 N pulls horizontally on a 1.4-kg block that slides on a rough, horizontal surface. This block is connected by a horizontal string to a second block of mass m2 = 2.32 kg on the same surface. The coefficient of kinetic friction is µk = 0.22 for both blocks...
*Thursday, November 13, 2014 at 10:29pm*

**Physics**

A block is placed on a frictionless ramp at a height of 14.5 m above the ground. Starting from rest, the block slides down the ramp. At the bottom of the ramp, the block slides onto a frictionless horizontal track without slowing down.At the end of the horizontal track, the ...
*Thursday, November 13, 2014 at 10:22pm*

**Physics**

The radius of the aorta is about 1.2cm , and the blood passing through it has a speed of about 50cm/s . Coefficient of viscosity for the whole blood (37∘) is n = 4×10^−3 Pa⋅s. Calculate the pressure drop per cm along the aorta.
*Thursday, November 13, 2014 at 9:44pm*

**physics**

The block of mass 1.43443 kg has an acceleration of 3.6 m/s^2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s^2 and the surface is frictionles
*Thursday, November 13, 2014 at 8:31pm*

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