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August 1, 2014

August 1, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A cylindrical bucket has a small hole at the bottom. The water exiting the hole has velocity v. What is the depth, h, of the water in the bucket? h=
*Saturday, December 14, 2013 at 6:39am*

**physics**

A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 2.0 m. Find ...
*Saturday, December 14, 2013 at 6:32am*

**physics**

Have a hoop (15kg) with a radius of 1.5m. Angular speed is 5 rad/s. What is the total KE possessed by the hoop? The hoop begins to climb an incline which is at a 15 degree angle. Measured along the incline, how far up the incline does it rool before stopping if the incline has...
*Saturday, December 14, 2013 at 12:51am*

**physics**

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc and the floor. What ...
*Friday, December 13, 2013 at 7:06pm*

**physics**

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc and the floor. What ...
*Friday, December 13, 2013 at 7:05pm*

**physics-important fast**

A 1532.9 kg car traveling with a speed of 12.7 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.4 m?
*Friday, December 13, 2013 at 2:01pm*

**physics**

Suppose you are riding a stationary exercise bicycle, and the electronic meter indicates that the wheel is rotating at 9.1 rad/s and that you have been riding for a "distance" of 8.6 x 103m. The wheel has a radius of 0.45 m. For how many minutes have you been riding ...
*Friday, December 13, 2013 at 1:48pm*

**Physics-urgent**

A speeder is driving down the road at a constant 20 m/s, he passes a patrolman parked on the roadside. The patrolman waits 3 seconds, then pursues the speeder, accelerating at a constant 4.0 m/s. How long does it take the patrolman to catch the speeder? How far has he traveled...
*Friday, December 13, 2013 at 11:20am*

**physics**

A 1.13 kg skateboard is coasting along the pavement at a speed of 4.28 m/s when a 0.93 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination?
*Thursday, December 12, 2013 at 11:58pm*

**pHYSICS HELP!**

A tennis player places a 44 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.064 kg tennis ball horizontally with a velocity of 35.2 m/s toward the north. What is the final velocity of the machine?
*Thursday, December 12, 2013 at 11:44pm*

**physics**

When the net force that acts on a hockey puck is 12 N, the puck accelerates at a rate of 48 m/s2. Determine the mass of the puck.
*Thursday, December 12, 2013 at 11:24pm*

**Physics**

A ball has an initial velocity of -23m/s. If the ball has a new velocity of 76m/s after 27 seconds, what is the ball acceleration
*Thursday, December 12, 2013 at 11:23pm*

**PHYSICS HELP!**

An 88.5 kg fullback moving east with a speed of 5.5 m/s is tackled by a 94.0 kg opponent running west at 2.90 m/s, and the collision is perfectly inelastic. (a) Calculate the velocity of the players just after the tackle. m/s (b) Calculate the decrease in kinetic energy during...
*Thursday, December 12, 2013 at 10:40pm*

**physics HELP!**

A 4.0 g coin sliding to the right at 26.0 cm/s makes an elastic head-on collision with a 12.0 g coin that is initially at rest. After the collision, the 4.0 g coin moves to the left at 13 cm/s. (a) Find the final velocity of the other coin. cm/s (b) Find the amount of kinetic ...
*Thursday, December 12, 2013 at 10:39pm*

**PHYSICS HELP!**

A 73.5 kg ice skater moving to the right with a velocity of 2.64 m/s throws a 0.18 kg snowball to the right with a velocity of 23.8 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*Thursday, December 12, 2013 at 10:38pm*

**physics**

A 0.20 kg baseball moving at +25.20 m/s is slowed to a stop by a catcher who exerts a constant force of -387 N. A)How long does it take this force to stop the ball? B)How far does the ball travel before stopping?
*Thursday, December 12, 2013 at 10:37pm*

**physics**

A tight uniform string with a length of 1.80 m is tied down at both ends and placed under a tension of 100 N. When it vibrates in its third harmonic, the sound given off has a frequency of 79.0Hz . Part A What is the mass of the string?
*Thursday, December 12, 2013 at 10:30pm*

**Physics-science**

what is the heat required in kilo calories to covert 2kg of ice at 0 c completely into stream at 100c
*Thursday, December 12, 2013 at 8:12pm*

**Physics**

Suppose 2.7 centimeters of rain at 15 degrees Celsius falls on a rectangular field of dimensions 2.1 kilometers by 1.1 kilometers. The amount of energy released when water vapor condensed and cooled to form this rain is equivalent to how many Hiroshima-size atomic bombs? One ...
*Thursday, December 12, 2013 at 7:15pm*

**Physics**

A chunk of metal with a mass of 81.1 grams and a specific heat of 153 joules per kilogram·kelvin is heated to 95.7 degrees Celsius and placed in 144 milliliters of water at 19.5 degrees Celsius. What are the final temperatures of the metal and the water?
*Thursday, December 12, 2013 at 7:13pm*

**physics**

How much tangential force must be exerted to stop a rotating solid disk (radius = 1.50 feet) weighing 480 lbs in 12.0 seconds? The disk is initially rotating at 600 RPM.
*Thursday, December 12, 2013 at 7:02pm*

**physics**

A missile is fired horizontally with an initial velocity of 300 m/s from the top of a cliff 200.0 meters high. a. How long does it take the missile to reach the bottom the cliff? b. How far from the base of the cliff does the missile strike the ground?
*Thursday, December 12, 2013 at 6:07pm*

**physics**

an auto, moving too fast on a horizontal stretch of mountain road, slides off the road, falling into deep snow 43.9 meters below the road and 87.7 meters beyond the edge of the road. a. How long did the auto take to fall? b. How fast was it going when it left the road?
*Thursday, December 12, 2013 at 6:05pm*

**physics**

An airplane traveling 1001 meters above the ocean at 35 m/s is to drop a box of supplies to shipwrecked victims below. a. How many seconds before being directly overhead should the box be dropped?
*Thursday, December 12, 2013 at 6:05pm*

**Physics, HELP**

AN auto, moving too fast on a horizontal stretch of mountain road, slides off the road, falling into deep snow 43.9 meters below the road and 87.7 meters beyond the edge of the road. a. How long did the auto take to fall? b. How fast was it going when it left the road?
*Thursday, December 12, 2013 at 5:49pm*

**physics. HELP**

Phil jumps off a high-diving platform with a horizontal velocity if 2.8 m/s and lands in the water 2.6 seconds later. a. How high is the platform b. How far out from where he jumped does he land?
*Thursday, December 12, 2013 at 5:47pm*

**physics**

The area of a span that is unaffected by an applied force is
*Thursday, December 12, 2013 at 5:44pm*

**Physics**

A 13g bullet traveling 330 m/s penetrates a 2.0 kg Block of wood and emerges going 270 m/s . If the block is stationary on a frictionless surface when hit how fast does it move after the bullet emerges?
*Thursday, December 12, 2013 at 5:35pm*

**physics**

If a board spans two bricks and carries a load of 10kg, where on the board does tension occur?
*Thursday, December 12, 2013 at 5:33pm*

**physics**

An object that deforms when a force is applied to it and returns to its original form when the force is no longer applied is said to be
*Thursday, December 12, 2013 at 5:30pm*

**Physics... HELP**

A toy car runs off the edge of a table that is 1.225 meters high. If the car lands 0.400 meters from of the table, a. How long does it take for the car to fall? b. What is the horizontal velocity of the car?
*Thursday, December 12, 2013 at 4:12pm*

**physics**

A dart player throws a dart horizontally at a speed of of 12.4 m/s. The dart hits the board 0.32 meters below the height from which it was thrown. How far away is the player from the board?
*Thursday, December 12, 2013 at 4:10pm*

**physics**

A missile is fired horizontally with an initial velocity of 300 m/s from the top of a cliff 200.0 meters high. a. How long does it take the missile to reach the bottom the cliff? b. How far from the base of the cliff does the missile strike the ground?
*Thursday, December 12, 2013 at 4:08pm*

**Physics Classical Mechanics**

A person of mass m2= 85.0 kg is standing on a rung, one third of the way up a ladder of length d= 4.0 m. The mass of the ladder is m1= 15.0 kg, uniformly distributed. The ladder is initially inclined at an angle θ= 40.0∘ with respect to the horizontal. Assume that ...
*Thursday, December 12, 2013 at 1:48pm*

**Physics**

A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 30.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 3.0 m. Find ...
*Thursday, December 12, 2013 at 1:06pm*

**Physics**

An infinitely long wire carries a current I=100A. Below the wire a rod of length L=10cm is forced to move at a constant speed v=5m/s along horizontal conducting rails. The rod and rails form a conducting loop. The rod has resistance of R=0.4ohms. The rails have neglibible ...
*Thursday, December 12, 2013 at 8:29am*

**Physics**

A straight copper wire that is 1 milimeter in diameter carries a current of 20 miliamps. Whas the magnitude of the largest magnetic field created by this wire in Tesla?
*Thursday, December 12, 2013 at 8:28am*

**Physics**

Two thin, infinitely long, parallel wires are lying on the ground a distance d=3cm apart. They carry a current Io=200A going into the page. A third thin, infinitely long wire with mass per unit length λ=5g/m carries current I going out of the page. What is the value of ...
*Thursday, December 12, 2013 at 8:28am*

**Physics**

Two thin, infinitely long, parallel wires are lying on the ground a distance d=3cm apart. They carry a current Io=200A going into the page. A third thin, infinitely long wire with mass per unit length λ=5g/m carries current I going out of the page. What is the value of ...
*Thursday, December 12, 2013 at 8:27am*

**Physics **

Problem 3- A 12 kg stone slides down a snow-covered hill, leaving point A with a speed of 10 m/s . There is no friction on the hill between points A and B, but there is friction on the level ground at the bottom of the hill, between B and the wall. After entering the rough ...
*Thursday, December 12, 2013 at 4:58am*

**Physics **

Problem 2- A 350 kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the figure. a) How fast is the roller coaster moving at point B? b) How hard does it press against the track at point B?
*Thursday, December 12, 2013 at 4:58am*

**Physics **

Problem 1- In one day, a 85 kg mountain climber ascends from the 1440 m level on a vertical cliff to the top at 2360 m . The next day, she descends from the top to the base of the cliff, which is at an elevation of 1310 m . a) What is her gravitational potential energy on the ...
*Thursday, December 12, 2013 at 4:57am*

**physics- multiple choice**

1. Two forces are applied to a box on a frictionless surface. One force is 40 N [S]. The second force is 70 N [N30ºW]. What is the overall net force? a) 40.6 N [S59.5ºE] b) 110 N c) 40.6 N [N59.5ºW] d) 40.6 N [S30.5ºW] 2. When drawing free body diagrapms, ...
*Thursday, December 12, 2013 at 2:21am*

**physics**

A magnetic field is uniform in a region of radius 10 cm, and increasing at 0.02 Tesla/second.
*Thursday, December 12, 2013 at 1:36am*

**Physics**

A 275 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. a) Calculate the magnitude of the force exerted by the man. b) Calculate the work...
*Wednesday, December 11, 2013 at 9:02pm*

**Physics**

A 275 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. a) Calculate the magnitude of the force exerted by the man. b) Calculate the work...
*Wednesday, December 11, 2013 at 9:01pm*

**Math - Precalculus - Parametric Equations/Geometry**

A hockey puck of diameter 3 inches is spinning around its center at a speed of 3 counterclockwise rotations per second. The center of the puck is traveling at a speed of 24 inches per second at an angle of 45 degrees to the positive real axis. (a) At time t=0, the center of ...
*Wednesday, December 11, 2013 at 5:07pm*

**Physics**

Find the tension T2 of the box hanging from the rope if 1 = 25°, 2 = 65°, T1 = 60.58 newtons, and W = 143.4 newtons.
*Wednesday, December 11, 2013 at 1:53pm*

**PHYSICS I NEED HELP**

Consider free protons following a circular path in a uniform magnetic field with a radius of 1 meter. At t = 0, the magnitude of the uniform magnetic field begins to increase at 0.001 Tesla/second. Enter the tangential acceleration of the protons in meters/second^2: positive ...
*Wednesday, December 11, 2013 at 12:26pm*

**Physics..**

A container of gas is at a pressure of 1.3x10^5 Pa and a volume of 6.0m^3. How much work is done by the gas if it expands at constant pressure to twice its initial volume? Please help me I really dont know what to do,,,
*Wednesday, December 11, 2013 at 12:00pm*

**Physics **

A music is played causing 82 dB. A baby cries causing 72 dB annoying the people around him by 123.7 m. What is the sound intensity level?
*Wednesday, December 11, 2013 at 11:36am*

**Physics **

A skydiver falls in air reaching terminal velocity, he shouts to his friend at 2000 Hz. His friend receives it at 2355 Hz, what is the divers speed?
*Wednesday, December 11, 2013 at 11:34am*

**Physics **

A simple harmonic pendulum has a period of 3.19 s and initial speed of 2.12 m/s. Find the length.
*Wednesday, December 11, 2013 at 11:33am*

**Physics **

A rocket is fired with 9.37 km/hr, find the maximum altitude. (no air resistance)
*Wednesday, December 11, 2013 at 11:32am*

**Physics **

Two organ pipes are imitating a sound of 12 Hz, one of them is 12 m long. What is the length of the other pipe?
*Wednesday, December 11, 2013 at 11:29am*

**Physics Classical Mechanics**

A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 2.0 m. Find ...
*Wednesday, December 11, 2013 at 7:53am*

**Physics Classical Mechanics**

A hydrometer is a device that measures the density of a liquid. The one shown in the figure has a cylindrical bulb of radius R attached to a cylindrical stem of radius r and length l. When placed in a liquid, the device floats as shown in the figure with a length h of stem ...
*Wednesday, December 11, 2013 at 7:52am*

**Physics Classical Mechanics**

A U-tube open at both ends to atmospheric pressure P0 is filled with an incompressible fluid of density ρ . The cross-sectional area A of the tube is uniform and the total length of the column of fluid is L . A piston is used to depress the height of the liquid column on ...
*Wednesday, December 11, 2013 at 7:52am*

**Physics Classical Mechanics**

Attach a solid cylinder of mass M and radius R to a horizontal massless spring with spring constant k so that it can roll without slipping along a horizontal surface. If the system is released from rest at a position in which the spring is stretched by an amount x0 what is the...
*Wednesday, December 11, 2013 at 7:52am*

**Physics Classical Mechanics**

A bar of mass m and negligible height is lying horizontally across and perpendicular to a pair of counter rotating rollers as shown in the figure. The rollers are separated by a distance D. There is a coefficient of kinetic friction μk between each roller and the bar. ...
*Wednesday, December 11, 2013 at 7:51am*

**Physics**

Moe, Larry, and Curly stand in a line with a spacing of d = 1.40m . Larry is 3.00m in front of a pair of stereo speakers 0.800m apart, as shown in the figure(Figure 1) . The speakers produce a single-frequency tone, vibrating in phase with each other. What are the two lowest ...
*Wednesday, December 11, 2013 at 4:03am*

**Physics**

A horizontal pipe contains water at a pressure of 120kPa flowing with a speed of 1.4m/s . The pipe narrows to one-half its original diameter. a) what is the speed of the water? b) what is the pressure of the water? I tried using the continuity equation A1V1=A2V2, then V2= (A1/...
*Wednesday, December 11, 2013 at 4:01am*

**Physics**

In the hydraulic system shown in the figure, the piston on the left has a diameter of 4.5cm and a mass is 3.0kg. If the density of the fluid is 710kg/m^3 , what is the height difference h between the two pistons in m? I checked the other similar questions like this and tried ...
*Wednesday, December 11, 2013 at 3:57am*

**Physics**

In the hydraulic system shown in the figure, the piston on the left has a diameter of 4.5cm and a mass is 3.0kg. If the density of the fluid is 710kg/m^3 , what is the height difference h between the two pistons in m? I checked the other similar questions like this and tried ...
*Wednesday, December 11, 2013 at 3:56am*

**Physics**

A cylindrical container 1.5m tall contains mercury to a certain depth, d. The rest of the cylinder is filled with water. If the pressure at the bottom of the cylinder is two atmospheres, what is the depth d? I used this equation: 2atm = 1atm + (density of water* gravity* ...
*Wednesday, December 11, 2013 at 3:52am*

**PHYSICS PLZ**

A very large loop of metal wire with radius 1 meter is driven with a linearly increasing current at a rate of 200 amps/second. A very small metal wire loop with radius 5 centimeter is positioned a small distance away with its center on the same axis (the loops are coaxial). ...
*Wednesday, December 11, 2013 at 1:00am*

**physics**

An airplane with a speed of 46.4 m/s is climbing upward at an angle of 44° counterclockwise from the positive x axis. When the plane's altitude is 700 m the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath ...
*Tuesday, December 10, 2013 at 9:14pm*

**physics**

in other terms of units, what is a joule equal to? a)N*m b)N/m c)W/s d)s/W e)N*s
*Tuesday, December 10, 2013 at 8:22pm*

**Physics**

a): Two 50 g ice cubes are dropped into 200 g of water in a thermally insulated container. If the water is initially at 25 degree Celsius, and the ice comes directly from a freezer at -15 degree Celsius, what is the final temperature at thermal equilibrium? b): What is the ...
*Tuesday, December 10, 2013 at 6:10pm*

**Physics**

A pair of constant forces of magnitude F = 11.1 N is applied to opposite sides of the axle of a top, as shown in the figure. The diameter of the axle is d = 8.67 mm. The angle è, which has a value of 36.1°, describes the steepness of the top's sloping sides. The...
*Tuesday, December 10, 2013 at 5:50pm*

**ap physics**

A spherical comet of mass m and diameter is d, travelling at velocity v enters a cloud of stationary cosmic meteoroids (small rocks). The average density of the cloud is p. When a meteoroid impacts the comet it adheres to its surface. As a result the comet slows down and after...
*Tuesday, December 10, 2013 at 4:01pm*

**physics**

A runner of mass m = 48 kg and running at 3.7 m/s runs as shown and jumps on the rim of a playground merry-go-round which has a moment of inertia of 378 kg·m2 and a radius of 2 meters. Assuming the merry-go-round is initially at rest, what is its final angular velocity ...
*Tuesday, December 10, 2013 at 3:33pm*

**Physics**

A car with a total mass of 1.48 103 kg has wheels of radius 33.5 cm and moment of inertia 0.810 kg · m2. (a) Find the car's translational kinetic energy when the car is moving at a speed of 30.0 m/s. (b) Find the car's rotational energy when the car is moving at...
*Tuesday, December 10, 2013 at 3:16pm*

**Physics**

Two spheres of masses m = 1.09 g and m' = 1.03*10^2 kg are isolated from all other bodies and are initially at rest, with their centers a distance r = 14 cm apart. One minute later, the smaller sphere has moved 0.500 mm toward the larger sphere. Compute the acceleration ...
*Tuesday, December 10, 2013 at 1:55pm*

**physics**

A vertical scale on a spring balance reads from 0 to 220N . The scale has a length of 15.0cm from the 0 to 220N reading. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.45Hz . Part A Ignoring the mass of the spring, what is the mass m of ...
*Tuesday, December 10, 2013 at 1:54pm*

**Physics**

The equation of motion for an oscillator in vertical SHM is given by y=(0.60m)sin[(130rad/s)t]. Part A What is the amplitude of this motion? Part B What is the frequency of this motion? Part C What is the period of this motion?
*Tuesday, December 10, 2013 at 1:48pm*

**Physics**

Ice of mass 51.5 g at -10.2° C is added to 218 g of water at 13.5° C in a 111 g glass container of specific heat 0.200 cal/g-°C at an initial temperature of 24.9° C. Find the final temperature of the system.
*Tuesday, December 10, 2013 at 1:48pm*

**Physics**

A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. If the walls are at 13.8° C and the rate of radiation is 96.0 kcal/h (a typical basal metabolic rate), what is the ...
*Tuesday, December 10, 2013 at 1:47pm*

**Physics**

Help!!!! Please!!! The coefficient of performance of a refrigerator is defined as the ratio of heat extracted from the refrigeration compartment to the work required to operate the refrigerator. A certain refrigerator has a coefficient of performance of 4 and requires 515 W of...
*Tuesday, December 10, 2013 at 1:37pm*

**Ap Physics 1**

The 1800 kg tractor exerts a force of 17500N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0.210 m/s2, what is the mass of the airplane? (b) Calculate the force exerted by the tractor on the airplane, ...
*Tuesday, December 10, 2013 at 9:53am*

**physics Classical Mechanics**

A stick of length l =70.0cm rests against the wall. The coefficient of static friction between stick and wall and between the stick and the floor are equal. The stick will slip off the wall if placed at an angle greater than theta = 41 degrees. What is the the coefficient of ...
*Tuesday, December 10, 2013 at 9:46am*

**Physics Classical Mechanics**

Thanks to everyone who helped me out. I got through.
*Tuesday, December 10, 2013 at 9:40am*

**Ap Physics 1**

The 1800 kg tractor exerts a force of 1.75 104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0.210 m/s2, what is the mass of the airplane? (b) Calculate the force exerted by the tractor on the airplane...
*Tuesday, December 10, 2013 at 9:37am*

**Physics **

A sonar generator on a submarine produces periodic ultrasonic waves at a frequency of 2.60MHz . The wavelength of the waves in seawater is 5.90×10−4m . When the generator is directed downward, an echo reflected from the ocean floor is received 11.0s later. Part A ...
*Tuesday, December 10, 2013 at 4:06am*

**PHYSICS!!!!!!!! HELP!!!!!!!**

Can someone give me an example of a problem where you have to find electric field and magnetic field using an electron gun?
*Tuesday, December 10, 2013 at 12:35am*

**Physics**

what is the accuracy percent of 11 divided by 267 times 100?
*Monday, December 9, 2013 at 9:04pm*

**physics**

A 0.67-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.10 to 0.21 m (relative to its unstrained length), the speed of the sphere decreases from 5.35 to 4.55 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
*Monday, December 9, 2013 at 8:17pm*

**Physics**

if 2.7j of work is done in raising a 180g apple how far is it lifted
*Monday, December 9, 2013 at 5:55pm*

**physics**

A ball is thrown horizontally from the top of a building 150 meters high. The ball strikes the ground 56 meters horizontally from the point of release. What is the speed of the ball just before it strikes the ground?
*Monday, December 9, 2013 at 5:35pm*

**physics**

A ball is thrown horizontally from the top of a building 150 meters high. The ball strikes the ground 56 meters horizontally from the point of release. What is the speed of the ball just before it strikes the ground?
*Monday, December 9, 2013 at 5:35pm*

**physics**

A ball is thrown horizontally from the top of a building 150 meters high. The ball strikes the ground 56 meters horizontally from the point of release. What is the speed of the ball just before it strikes the ground?
*Monday, December 9, 2013 at 5:35pm*

**Physics**

At 1.5 km from the transmitter, the peak electric field of a radio wave is 350 mV/m. (a) What is the transmitter’s power output, assuming it broadcasts uniformly in all directions ? (b) What is the peak electric field 10 km from the transmitter ?
*Monday, December 9, 2013 at 5:26pm*

**physics**

A block of mass m= 3 kg is initially at rest on a horizontal surface. At time t=0, we begin pushing on it with a horizontal force that varies with time as F(t)=βt2, where β= 0.6 N/s2. We stop pushing at time t1=5 s [F(t)=0 for t>t1]. (a) First, assume the surface ...
*Monday, December 9, 2013 at 2:43pm*

**Physics(Help!!!!!!)**

A stick of length l = 65.0 cm rests against a wall. The coefficient of static friction between stick and the wall and between the stick and the floor are equal. The stick will slip off the wall if placed at an angle greater than Î¸ = 39.0 degrees. What is the ...
*Monday, December 9, 2013 at 1:56pm*

**Physics(Help!!!!)**

A person of mass m2= 85.0 kg is standing on a rung, one third of the way up a ladder of length d= 3.0 m. The mass of the ladder is m1= 15.0 kg, uniformly distributed. The ladder is initially inclined at an angle Î¸= 35.0âˆ˜ with respect to the ...
*Monday, December 9, 2013 at 1:54pm*

**PHYSICS(HELP)**

A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= ...
*Monday, December 9, 2013 at 10:00am*

**physicS IMP PLS**

Consider a rocket in space that ejects burned fuel at a speed of Vex = 1.5 km/s with respect to the rocket. The rocket burns 5% of its mass in 280 seconds. (a) What is the speed V of the rocket after a burn time of 140 seconds (in m/s)? (b) What is the instantaneous ...
*Monday, December 9, 2013 at 6:34am*

**physics(URGENT!!!!!)**

8.01xers Can anybody help with the falling ruler. I submission left(
*Monday, December 9, 2013 at 3:08am*

**Physics(URGENT!!!!)**

A ruler stands vertically against a wall. It is given a tiny impulse at Î¸=0âˆ˜ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that Ï‰(Î¸=0&...
*Monday, December 9, 2013 at 1:57am*

**Physics**

Really need help with this asap plz~ there is a 4kg wooden block on top of a wooden ramp forming an angle of 37 degrees above surface.The block is placed 1.2 m up on the ramp and the ramp is connected to another wooden flat board.So when the block slides down, it continues a ...
*Sunday, December 8, 2013 at 11:18pm*

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