Thursday

March 5, 2015

March 5, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**AP physics**

A particle of mass 3.00 kg is projected vertically upward with an initial velocity of 20.0 m/s. Neglecting air resistance, the particle’s kinetic energy when it is 20 m above the initial position is:
*Thursday, December 11, 2014 at 10:40pm*

**physics**

A 75 kg person escapes from the burning building by jumping from the window 25 m above a catching net air resistance exerts a 95 N force on the person during the fall apply Newton second law find the acceleration during the fall find the velocity and free body diagram
*Thursday, December 11, 2014 at 10:18pm*

**physics**

A 590 kg racing car completes one lap in 14.3 seconds around a circular track with a radios of 45.0 meters. The car moves at constant speed. (A) what is the acceleration of the car? (B) what force must the track exert on the tires to produse this acceleration?
*Thursday, December 11, 2014 at 9:09pm*

**Physics- Is my work right?**

A ball moving at +3.0 m/s along a table rolls off a table and lands on the ground 2.0 m away. How high was the table? h = 9.8 × (2/3)² / 2 = 2.2 m
*Thursday, December 11, 2014 at 7:54pm*

**vy? in Physics**

During what time interval does vy become zero? So I can't really understand what vy means, I know its a abbreviation but I need help on this problem that has a cannon shooting a cannonball horizontally and it has 3 points; the first being 1s, then 2s, then 3s which is when...
*Thursday, December 11, 2014 at 7:51pm*

**Physics help**

A soccer player kicks a soccer ball at +10.0 m/s at an angle of 60°. What are the horizontal and vertical components of velocity of the kick? So I got; vx = +8.66 m/s and vy = +5.00 m/s but I feel like I might have gotten the + and - wrongs..Did I mess up on them or did I ...
*Thursday, December 11, 2014 at 7:42pm*

**physics**

Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement?
*Thursday, December 11, 2014 at 7:06pm*

**Physics**

A 30 ohm resistor is connected to a 1.5 V battery. How much power is dissipated by the resistor? I'm confused of the formula to use here.
*Thursday, December 11, 2014 at 6:12pm*

**Physics**

A 4 ohm resistor and 10 ohm resistor are connected in series. If this circuit is connected to a 12 V battery, how much current will flow through the circuit?
*Thursday, December 11, 2014 at 5:49pm*

**Physics**

A ladder of mass M and length 6 m rests against a frictionless wall at an angle of 50 degrees to the horizontal. The coefficient of static friction between the ladder and the floor is 0.5. What is the maximum distance along the ladder a person of mass 11M can climb before the ...
*Thursday, December 11, 2014 at 3:57pm*

**PHYSICS**

An airplane accelerates down a runway at 3.20 m/s 2 for 32.8 s until is finally lifts off the ground. Determine the distancetraveled before takeoff.
*Thursday, December 11, 2014 at 3:54pm*

**Physics**

A 80.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1320 N. If the diver comes to rest 5.1 m below the water's surface, what is the total distance between the diving board and the diver's ...
*Thursday, December 11, 2014 at 1:02pm*

**physics**

An 56.0 N box of clothes is pulled 5.2 m up a 30.0° ramp by a force of 104 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy.
*Thursday, December 11, 2014 at 12:46pm*

**PHYSICS**

2.- A man of 73 kg has a volume of 75 l, of which 5 l correspond to the lungs. (a) Calculate the volume of the lungs when going in apnea underwater to a depth of 10 m, assuming that the density of sea water is 103 kg/m3 . (b) At that depth, will the total forces acting on him ...
*Thursday, December 11, 2014 at 10:39am*

**physics**

A mover has to move a heavy sofa of mass 66 kg to the second floor of the house. As he pulls on the rope tied to the sofa he makes sure that the rope is parallel to the surface of the ramp, which is at 30.0° to the horizontal. If the coefficient of kinetic friction between...
*Thursday, December 11, 2014 at 10:34am*

**physics**

An 56.0 N box of clothes is pulled 5.2 m up a 30.0° ramp by a force of 104 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy. J
*Thursday, December 11, 2014 at 9:05am*

**physics**

A child and sled with a combined mass of 45.0 kg slide down a frictionless hill that is 8.79 m high. If the sled starts from rest, what is its speed at the bottom of the hill? m/s
*Thursday, December 11, 2014 at 8:24am*

**physics**

A plane designed for vertical takeoff has a mass of 8.2 ✕ 103 kg. Find the net work done by all forces on the plane as it accelerates upward at 10.5 m/s2 through a distance of 25.4 m after starting from rest. J
*Thursday, December 11, 2014 at 7:15am*

**Physics**

a 60-kg student travelling in a car with a constant velocity has a kinetic energy of 1.2 *10^4 J. What is the speedometer reading of the car in km/h?
*Thursday, December 11, 2014 at 4:25am*

**Physics**

An 85.7N box of clothes is pulled 26.2m up a 31.7 degree ramp by a force of 112N that points along the ramp. The acceleration of gravity is 9.81 m/s^2 How high does it rise above the point of release? What i got as the equation is Einitial +- work = Efinal
*Thursday, December 11, 2014 at 1:01am*

**PHYSICS**

A 209 kg block is released at height h = 3.3 m as shown. The track is frictionless except for a portion of length 7 m. The block travels down the track, hits a spring of force constant k = 1545 N/m, and compresses it 1.9 m from its equilibrium position before coming to rest ...
*Wednesday, December 10, 2014 at 11:53pm*

**Physics**

An 82.9 N box of clothes is pulled 28.2 m up a 20.7◦ ramp by a force of 117 N that points along the ramp. The acceleration of gravity is 9.81 m/s^2. If the coefficient of kinetic friction between the box and ramp is 0.29, calculate the change in the box’s kinetic ...
*Wednesday, December 10, 2014 at 11:50pm*

**physics**

A student, late for class, ran up some stairs between landings, which are 11.3 m apart. The student’s mass is 62 kg and it took 6.02 s to do the run. What is the average power that the student generated during the run?
*Wednesday, December 10, 2014 at 11:45pm*

**Physics**

An 85.7N box of clothes is pulled 26.2m up a 31.7 degree ramp by a force of 112N that points along the ramp. The acceleration of gravity is 9.81 m/s^2 How high does it rise above the point of release? What i got as the equation is Einitial +- work = Efinal
*Wednesday, December 10, 2014 at 11:27pm*

**Physics **

A thin, 8.3 m long copper rod in a uniform magnetic field has a mass of 68 g. When the rod carries a current of .343 A, it floats in the magnetic field. What is the field strength of the magnetic field?
*Wednesday, December 10, 2014 at 9:56pm*

**Physics **

Calculate the force on an electron that is 3.8e-6 m from a proton.
*Wednesday, December 10, 2014 at 9:46pm*

**Physics**

A 10 ohm resistor and a 20 ohm resistor are connected in parallel. What is the equivalent resistance of this setup? What formula do I use for this?
*Wednesday, December 10, 2014 at 9:41pm*

**Physics**

Aluminum has a resistivity of 2.7*10-8 Ùm. What would be the resistance of 100 m of aluminum wire with a cross-sectional area of 2*10-4 m2?
*Wednesday, December 10, 2014 at 8:13pm*

**Physics**

A 0.340 kg block on a vertical spring with a spring constant of 4.09 × 103 N/m is pushed downward, compressing the spring 0.0700 m. When released, the block leaves the spring and travels upward vertically. The acceleration of gravity is 9.81 m/s2 . How high does it rise ...
*Wednesday, December 10, 2014 at 8:11pm*

**Physics**

Knowing the temperature at the surface of the Earth to be 72 F, find the temperature at the surface of Venus.
*Wednesday, December 10, 2014 at 6:57pm*

**Physics **

A 15.3 kg block is dragged over a rough, horizontal surface by a constant force of 130 N acting at an angle of 26.4◦ above the horizontal. The block is displaced 16 m, and the coefficient of kinetic friction is 0.1. Find the work done by the 130 N force. The acceleration...
*Wednesday, December 10, 2014 at 6:22pm*

**Physics >.<**

A big truck has a mass of 5,000kg. It is moving down the road at a velocity of 15m/s. As it approaches a stop sign, the driver tries to stop, but the truck slides on ice and hits a car (mass = 500kg) that is stopped. After the collision, they move separately, the truck ...
*Wednesday, December 10, 2014 at 5:35pm*

**Physics**

How can you demonstrate that water is denser than ice without weighing them? What is the principle involved?
*Wednesday, December 10, 2014 at 5:31pm*

**physics**

what is retardation
*Wednesday, December 10, 2014 at 4:45pm*

**physics**

if a 175 g stationary hockey puck is struck with a force of 405 N east through a displacement of 245 mm east while in contact with a stick, determine the velocity of the puck as it leaves the stick.
*Wednesday, December 10, 2014 at 4:02pm*

**physics**

A round pipe of varying diameter carries petroleum from a wellhead to a refinery. At the wellhead the pipe's diameter is 56.3 cm (0.563 m) and the flow speed of the petroleum is 13.5 m/s. At the refinery the petroleum flows at 5.65 m/s. What is the volume flow rate of the ...
*Wednesday, December 10, 2014 at 3:17pm*

**physics**

A 6.110 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is μs = 0.455 and the coefficient of kinetic friction is μk = 0.255. At time t = 0, a force F = 16.8 N is applied horizontally to the block. State the ...
*Wednesday, December 10, 2014 at 2:50pm*

**physics**

A stunt man 60kg jumps down straight down at bozs below 10m from a balcony and he's going down at a speed of 50km/h. What is the force exerted on the boxs?
*Wednesday, December 10, 2014 at 1:02pm*

**physics**

A 145-g baseball travels at 35 m/s toward a baseball player's bat (the bat is the object of reference) and rebounds in the opposite direction at 40 m/s
*Wednesday, December 10, 2014 at 12:09pm*

**Physics**

An 11 kg object moves down a 25 degree incline at a constant speed. what is the magnitude of the coefficient of friction? I have m=11.0kg incline = 25 deg but i feel like I am missing one more number in order to calculate
*Wednesday, December 10, 2014 at 11:08am*

**physics**

Consider a system of a cliff diver and the earth. The gravitational potential energy of the system decreases by 21,000 J as the diver drops to the water from a height of 32.0 m. Determine her weight in newtons.
*Wednesday, December 10, 2014 at 10:45am*

**Physics**

A 1250 kg car traveling at 20 m/s suddenly runs out of gas while approaching the valley shown in the figure below. What will be the car's speed as it coasts into the gas station on the other side of the valley? (Assume that no energy is loss to friction.) file://dd-s-1/...
*Wednesday, December 10, 2014 at 9:24am*

**Physics**

Silver pellets with a mass of 1.0 g and a temperature of 85°C are added to 200 g of water at 18°C. How many pellets must be added to increase the equilibrium temperature of the system to 24°C?
*Wednesday, December 10, 2014 at 1:52am*

**physics**

A 2 kg lab cart is sliding across across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.0 seconds and in what direction? Update 2: what i don't...
*Wednesday, December 10, 2014 at 12:37am*

**physics**

A wheel is spinning with constant angular velocity the ratio of speed of a point on the end of rim to the speed of point halfway between the centre and the end point of rim is:........?
*Wednesday, December 10, 2014 at 12:27am*

**Physics**

Sir can you help me to solve this question on Physics Two persons p and q are standing 100m away from a high wall and seperated by distance d. P claps and q hears two sound (direct and echo) with a time difference of 0.2sec. Find the distance between p and q
*Tuesday, December 9, 2014 at 11:49pm*

**physics**

A 1543.1 kg car is traveling at 25.1 m/s when the driver takes his foot off the gas pedal. It takes 5.7 s for the car to slow down to 20 m/s. How large is the net force slowing the car? Answer in units of N
*Tuesday, December 9, 2014 at 11:34pm*

**physics**

An archer puts a 0.39 kg arrow to the bowstring. An average force of 196.3 N is exerted to draw the string back 1.28 m. The acceleration of gravity is 9.8 m/s 2 . Assuming no frictional loss, with what speed does the arrow leave the bow? Answer in units of m/s
*Tuesday, December 9, 2014 at 10:59pm*

**physics**

an ice skater starts her spin with her arms stretched straight out. She then pulls her armsin close to her body. Assume her moment of inertia when her arms are stretched out is 3.0 kg-m sqaured and it is 2.0 kg-m squared when she pulls them in tight. If she starts her spin at ...
*Tuesday, December 9, 2014 at 10:53pm*

**Physics**

Musicians can use beats to tune their instruments. One flute is properly tuned and plays the musical note A at exactly 440Hz. A second player sounds the same note and hears that her flute is slightly "flat" (that is, at too low of a frequency). Playing at the same ...
*Tuesday, December 9, 2014 at 10:21pm*

**physics **

A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...
*Tuesday, December 9, 2014 at 9:51pm*

**Physics HELP!**

A 50-g mass is attached to a spring and undergoes simple harmonic motion. Its maximum acceleration is 15m/s2 and its maximum speed is 3.5m/s . Determine the angular frequency. Determine the spring constant. Determine the amplitude of the motion. how do I find these things?
*Tuesday, December 9, 2014 at 9:11pm*

**physics **

A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...
*Tuesday, December 9, 2014 at 9:09pm*

**physics**

An amusement park ride consists of a rotating circular platform 8.09 m in diameter from which 10 kg seats are suspended at the end of 2.19 m mass less chains. When the system rotates, the chains make an angle of 14.8 ◦ with the vertical. The acceleration of gravity is 9....
*Tuesday, December 9, 2014 at 8:09pm*

**physics**

A golf ball rolled off the edge of a table that has a height of 1.25 m and lands 0.48 m away from the table. The golf ball took 0.505 s to hit the ground 0.48 m from the table. What was the horizontal velocity, to the nearest hundredth m/s, of the ball as it rolled off the ...
*Tuesday, December 9, 2014 at 7:47pm*

**Physics**

A player passes a 0.600-kg basketball down court for a fast break. The ball leaves the player's hands with a speed of 8.20m/s and slows down to 7.30m/s at its highest point.Ignoring air resistance, how high above the release point is the ball when it is at its maximum height?
*Tuesday, December 9, 2014 at 7:47pm*

**Physics**

A ball of mass m is attached to a spring with a spring constant k. The system is attached to a thin vertical axis as shown in Figure 4. In its equilibrium vertical position the spring length is L. The axis starts to rotate with a constant angular frequency ω. Find the ...
*Tuesday, December 9, 2014 at 2:59pm*

**physics**

help me thjuis site bloowssssssss
*Tuesday, December 9, 2014 at 1:03pm*

**physics**

Hahahahahahaha ha????
*Tuesday, December 9, 2014 at 11:57am*

**physics**

an airplane flies 200km from city a to city b east,then 200km south from city b to c,and finally 100km northwest to city d.how far is it from city a to city d.in what direction must the airplane head to return directly to city a from city d?
*Tuesday, December 9, 2014 at 10:08am*

**physics**

a fisherman noticed that his boat was lifted by the wter waves about once evry two seconds. He looked at the waves wnd estimated the length of a wave to be a 6cm. He also estimated the vertical distance between the highest point snd the lowest point of the wave to be 0.5m find...
*Tuesday, December 9, 2014 at 7:10am*

**physics**

A particle of mass 0.2kg is found to stretch a certain spring by 5.0 cm. a. What is the force constant of the spring? b. By how much will a 1kg mass stretch the spring.
*Tuesday, December 9, 2014 at 7:04am*

**physics**

A 17.9 kg block is dragged over a rough, horizontal surface by a constant force of 119 N acting at an angle of 30◦ above the horizontal. The block is displaced 40.7 m, and the coefficient of kinetic friction is 0.111. what is the final speed
*Tuesday, December 9, 2014 at 1:07am*

**physics**

A 17.9 kg block is dragged over a rough, horizontal surface by a constant force of 119 N acting at an angle of 30◦ above the horizontal. The block is displaced 40.7 m, and the coefficient of kinetic friction is 0.111. what is the final speed
*Tuesday, December 9, 2014 at 12:53am*

**physics**

The stone was thrown through a distance of 80 cm the act of throwing takes approximately 0.064 s. determine the launch velocity of the stone
*Tuesday, December 9, 2014 at 12:34am*

**general physics**

An axle of a mass of 10 kg, length 10 cm and radius .1 m is free to rotate about the axis which runs the length of the axle, throuhh it's center. A chain of mass 4kg is fastened to the axle at one end, wound exactly 6 times around the axle, and a rock of mass 1.8 kg ...
*Tuesday, December 9, 2014 at 12:01am*

**physics**

Assuming 100% transfer of energy in the system, please calculate maximum KE (Kinetic Energy) that the rocket has if the rocket were to again a height of 25 meters. Rocket mass = 0.5 kilograms, and gravity = 9.8 m/s^2
*Monday, December 8, 2014 at 11:18pm*

**physics**

Both drawings show the same square, each of which has a side of length L = 0.86 m. An observer O is stationed at one corner of each square. Two loudspeakers are located at corners of the square, as in either drawing 1 or drawing 2. The speakers produce the same single-...
*Monday, December 8, 2014 at 10:42pm*

**physics I**

A lost shipping container is found resting on the ocean floor and completely submerged. The container is 5.4 m long, 2.3 m wide, and 2.4 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface. When ...
*Monday, December 8, 2014 at 8:35pm*

**Physics**

A 2.3 × 103 kg car accelerates from rest under the action of two forces. One is a forward force of 1141 N provided by traction between the wheels and the road. The other is a 947 N resistive force due to various frictional forces. How far must the car travel for its ...
*Monday, December 8, 2014 at 8:29pm*

**AP physics**

A 2.84 × 103 kg car requires 5.4 kJ of work to move from rest to some final speed. During this time, the car moves 20.4 m. Neglecting friction, find a) the final speed.
*Monday, December 8, 2014 at 8:20pm*

**physics**

a movie last 2 hours. during that time what is the angular displacement of each of the following? a.the hour hand b.the minute hand c.the second hand
*Monday, December 8, 2014 at 7:46pm*

**physics help please please please!!!**

A spaceship lands on a new planet. the crew decides to measure the speed of sound in the planets atmosphere. taking a tube with a length of 50 cm, they find that one resonant frequency occurs at 2,520 Hz, and the next resonant frequency at 2,940 hz. what is the speed of the ...
*Monday, December 8, 2014 at 7:06pm*

**physics**

A movie lasts 2 hours. During that time, what is the angular displacement of each of the following? a.the hour hand b.the minute hand c.the second hand
*Monday, December 8, 2014 at 6:57pm*

**statics/physics**

The uniform 10-kg ladder in the figure rests against the smooth wall at B, and the end A rests on the rough horizontal plane for which the coefficient of static friction is 0.3. determine the angle of inclination of the ladder and the normal reaction at b if the ladder is on ...
*Monday, December 8, 2014 at 5:26pm*

**Physics**

A weight of 690 N is held by two cables. The left-hand cable had tension T2 and makes an angle of 41◦ with the ceiling. The right-hand cable had tension T1 and makes an angle of 42◦ with the ceiling. What is the tension in the cable labeled T1 slanted at an angle ...
*Monday, December 8, 2014 at 5:10pm*

**Physics**

Consider the 690 N weight held by two cables. The left-hand cable had tension T2 and makes an angle of 41◦ with the ceiling. The right-hand cable had tension T1 and makes an angle of 42◦ with the ceiling.
*Monday, December 8, 2014 at 4:28pm*

**physics**

A 75-g piece of aluminum at 89 °C is dropped in 1.0 L of water at 1.3 101 °C, which is in an insulated beaker. Assuming that there is negligible heat loss to the surroundings, determine the equilibrium temperature of the system
*Monday, December 8, 2014 at 3:54pm*

**Physics**

A box of books weighing 337 N is shoved across the floor by a force of 467 N exerted downward at an angle of 35° below the horizontal. (a) If μk between the box and the floor is 0.56, how long does it take to move the box 4.00 m starting from rest? 2.518 s (b) What is...
*Monday, December 8, 2014 at 10:56am*

**Physics **

A hockey puck is hit on a frozen lake and starts moving with a speed of 13.80 m/s. Exactly 5.1 s later, its speed is 7.80 m/s. (a) What is the puck's average acceleration? m/s2 (b) What is the coefficient of kinetic friction between the puck and the ice?
*Monday, December 8, 2014 at 9:13am*

**Physics**

A 2.84 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 1.92 m in 1.90 s. (a) Find the magnitude of the acceleration of the block. m/s2 (b) Find the coefficient of kinetic friction between the block and the incline. (...
*Monday, December 8, 2014 at 8:59am*

**Physics**

A box of books weighing 337 N is shoved across the floor by a force of 467 N exerted downward at an angle of 35° below the horizontal. (a) If μk between the box and the floor is 0.56, how long does it take to move the box 4.00 m starting from rest? s (b) What is the ...
*Monday, December 8, 2014 at 8:34am*

**Physics**

A 2.0 kg mass starts from rest and slides down an inclined plane 7.9 ✕ 10-1 m long in 0.64 s. What net force is acting on the mass along the incline? N
*Monday, December 8, 2014 at 8:25am*

**physics**

Two forces are applied to a car in an effort to accelerate it, as shown below. The first force, F1 = 400 N, is applied at an angle α = 32° to the forward dashed line. The second force, F2 = 536 N, is applied at an angle β = 10° to the forward dashed line. (a...
*Monday, December 8, 2014 at 7:29am*

**Physics**

In one of your rigorous workout sessions, you lost 140 g of water through evaporation. Assume that the amount of work done by your body was 3.8 105 J and that the heat required to evaporate the water came from your body. (a) Find the loss in internal energy of your body (due ...
*Monday, December 8, 2014 at 2:20am*

**Physics**

Suppose 0.015 kg of steam (at 100.00 °C) is added to 0.20 kg of water (initially at 14.0°C). The water is inside an aluminum cup of mass 40 g. The cup is inside a perfectly insulated calorimetry container that prevents heat exchange with the outside environment. Find ...
*Monday, December 8, 2014 at 2:19am*

**Physics**

When a 34-m-long metal pipe is heated from 13 °C to 39 °C, it lengthens by 2.56 cm. Determine the linear expansion coefficient. I tried to start by taking the difference of temperature times the length of the pipe and finally divide 2.56 by the number i got before but ...
*Monday, December 8, 2014 at 1:57am*

**physics help!**

The earth attracts a large ﬂying bug toward its center with a force of 0.10 Newtons. With what force does the bug attract the earth itself? 1. 1.0 N 2. 0.10 N 3. Trillions of Newtons 4. 10 N 5. We need the mass of the bug. 6. Zero; the earth attracts the bug, not the ...
*Monday, December 8, 2014 at 12:52am*

**physics**

The sum of two forces, one having a magni- tude of 9 N acting due east and other having a magnitude of 4 N acting due north is
*Monday, December 8, 2014 at 12:23am*

**physics**

A 600 kg car is moving on a level road at 30 m/s. How large of a braking force is needed to stop it in a distance of 75m?
*Monday, December 8, 2014 at 12:21am*

**physics**

The earth attracts a large ﬂying bug toward its center with a force of 0.10 Newtons. With what force does the bug attract the earth itself?
*Monday, December 8, 2014 at 12:19am*

**physics**

Two people, one twice as massive as the other, try to play tug of war on a nearly frictionless, level, icy surface. When they begin to tug, they are 12 m apart. They tug by pulling the rope hand over hand, until their hands meet along the rope. How far does the heavier person ...
*Monday, December 8, 2014 at 12:16am*

**Physics**

A block is at rest on an inclined plane. 63 kg µs = 0.47 èc Find the critical angle, èc, at which the block just begins to slide. Answer in units of ◦
*Sunday, December 7, 2014 at 11:55pm*

**physics**

A staging that weighs Wstaging supports a painter weighing 160 N. The reading on the left scale is 700 N and the reading on the right scale is 620 N. 700 N 620 N What is the weight of the staging? Answer in units of N
*Sunday, December 7, 2014 at 11:33pm*

**Physics**

A uniform rod pivoted at one end (point O) is free to swing in a vertical plane in a grav- itational field, held in equilibrium by a force F at its other end. The rod of length 7 m and weight 4.7 N makes an angle 39◦ with the hor- izontal and the force an angle of 54&#...
*Sunday, December 7, 2014 at 11:21pm*

**Intro-Physics Help Please**

A spaceship lands on a new planet. the crew decides to measure the speed of sound in the planets atmosphere. taking a tube with a length of 50 cm, they find that one resonant frequency occurs at 2,520 Hz, and the next resonant frequency at 2,940 hz. what is the speed of the ...
*Sunday, December 7, 2014 at 11:15pm*

**physics**

an object explode and a to 2 kilograms piece moves north at 4 m/s and a 4 kilograms piece moves East at 1.5 meters per second. What is the momentum of the third piece? What is the mass of the third piece if it moves at a speed of 4 meters per second?
*Sunday, December 7, 2014 at 11:09pm*

**Physics**

A block is at rest on an inclined plane. The mass is 44 kg. µs = 0.54 Find the critical angle, θc, at which the block just begins to slide. Answer in units of ◦
*Sunday, December 7, 2014 at 8:40pm*

**physics**

Two artifacts in a museum display are hung from vertical walls by very light wires. Wire T1 is horizontal from the left wall and goes to a center weight of 177N and wire T2 is at a 53 degree angle with the right wall heading from right to left downwards towards the center ...
*Sunday, December 7, 2014 at 7:51pm*

**physics**

What is the gravitational acceleration on a planet where a 2.0 kg mass has a weight of 16 N on the planet`s surface?
*Sunday, December 7, 2014 at 7:49pm*

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