Thursday

November 27, 2014

November 27, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics- tension **

An 63 kg construction worker is sitting 2.0 m from the end of a 1435 kg steel beam to think about the state of the world. Find the tension in the cable that is supporting the beam. Am I required to use the formula T1=sin(theta)*m*g? I am not sure if the problem is similar to a...
*Tuesday, November 11, 2014 at 7:20pm*

**physics**

A glacier advances at 4.3 × 10−6 cm/s.How far will it move in 6.4 years? Assume there is 365 days each year. Answer in units of cm. Thanks in advance!!
*Tuesday, November 11, 2014 at 7:17pm*

**Physics- spring constant **

Astronauts are in space so there is no gravity, but they wish to weight themselves. The spring constant is 265 N/m. The question shows a graph; the y is the position in meters while the x is the seconds. I do not wish for an answer, but the way in which i'm supposed to ...
*Tuesday, November 11, 2014 at 7:15pm*

**physics**

The position of a 0.31 kg object attached to a spring is described by [x = (0.85 m) sin(2.37πt + 0.35)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/...
*Tuesday, November 11, 2014 at 6:50pm*

**Physics**

Mass 1 with a unknown mass starts at rest at the top of a frictionless from a height of 13 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is 25.4 kg and initially at rest. After ...
*Tuesday, November 11, 2014 at 6:29pm*

**Physics**

NASA, when it sends probes to other planets, uses what is known as a gravitational slingshot. This is when a probe uses the gravitational potential energy a planet to gain kinetic energy. Even though the probe and the planet are not physically colliding, one can treat this ...
*Tuesday, November 11, 2014 at 6:00pm*

**Physics**

A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 189.0 N at an angle of 30.0◦ with the horizontal. The box has a mass of 39.0 kg, and the coefficient of kinetic friction between the box and floor is 0....
*Tuesday, November 11, 2014 at 5:56pm*

**physics**

Mrs. Meissner is taking her dog Cooper for a walk. Cooper stops to sniff a tree stump and Mrs. Meissner has to exert a force of 148 N on Cooper's leash (held 35 angle above the horizontal) in order to get him to move 2.0 m away from the tree stump. Calculate the work donw ...
*Tuesday, November 11, 2014 at 4:51pm*

**physics**

An object on earth has a weight of 54.3N, what is the weight of the object on the moon, assuming acceleration due to gravity on the moon is 1.61m/s^2?
*Tuesday, November 11, 2014 at 4:39pm*

**Physics**

A dog sled weighing 750 lb is pulled over level snow at a uniform speed by a dog team exerting a force of 60 lb. find the coefficient of friction.
*Tuesday, November 11, 2014 at 4:36pm*

**physics**

The position of a 0.43 kg object attached to a spring is described by [x = (0.49 m) cos(1.25πt)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/second the...
*Tuesday, November 11, 2014 at 4:14pm*

**physics**

Rearrange the kinetic energy equation to solve for: m And v
*Tuesday, November 11, 2014 at 4:12pm*

**physics**

what is neutral atom?
*Tuesday, November 11, 2014 at 2:35pm*

**Physics**

A 70kg sky diver falls 5000m. a) by how much does her gpe decrease during her fall? Ep=mxgxh = 70x10x5000 = 3,500,000J b) By how much does her kinetic energy increase during the fall? KE GAINED = GPE LOST = 3,500,oooJ c) What would her speed be just before she hit the ground? ...
*Tuesday, November 11, 2014 at 2:27pm*

**physics **

A spring stretches 5.00 cm when a 10.00 g object is hung from it. The object is replaced with another object of mass 20.00 g that oscillates in simple harmonic motion. a) Calculate the spring constant in N/m. Use 9.8 m/s2 for g. b) Calculate the period of motion in seconds.
*Tuesday, November 11, 2014 at 2:21pm*

**physics**

If each of the three rotor helicopter blades is L = 3.69m long and has a mass of m = 159kg, calculate the moment of inertia of the three rotor blades about the axis of rotation.
*Tuesday, November 11, 2014 at 1:49pm*

**Physics**

A ball starts 1.175 meters off the ground and shot at an angle of 40 degrees with a velocity of 3.2 m/s. Where does it land?
*Tuesday, November 11, 2014 at 1:41pm*

**physics**

The distance between a hydrogen atom (m = 1.0u) and a chloride atom (m = 35.5u) in the HCl molecule is 1.27×10-10m. How far from the hydrogen atom is the center of mass of the molecule?
*Tuesday, November 11, 2014 at 1:22pm*

**physics**

a boy pulls a bucket of water of mass sky from a well of depth 10 cm calculate the work done ?
*Tuesday, November 11, 2014 at 11:01am*

**Physics**

A small ball with a mass of 30.0 g is loaded into a spring gun, compressing the spring by 13.0 cm. When the trigger is pressed, the ball emerges horizontally from the barrel at a height of 2.30 m above the floor. It then strikes the floor, after traveling a horizontal distance...
*Tuesday, November 11, 2014 at 10:43am*

**Physics**

An 8.46 kg block drops straight down from a height of 0.90 m, striking a platform spring having a force constant of 9.90 102 N/m. Find the maximum compression of the spring
*Tuesday, November 11, 2014 at 10:41am*

**physics**

A Second's pendulum is suspended from the roof of a lift.What will be the time period of the Pendulum if the lift is moving up with an acceleration of 2m/sec^2
*Tuesday, November 11, 2014 at 10:18am*

**physics **

a second's pendulum is suspended from the roof of the lift.what will be the time period of the pendulum if the lift is moving up with an acceleration 20m/s^2
*Tuesday, November 11, 2014 at 10:08am*

**physics**

a ruby laser emits light at wavelength 694.4nm. if a laser pulse is emitted for 12pico seconds and the energy released per pulse is 100mJ, what is the length of the pulse?
*Tuesday, November 11, 2014 at 8:28am*

**physics**

A cylinder of gas is compressed by a piston from an initial volume of 125litres to a final volume of 90 litres.The compression occurs at constant pressure,and the work done on the gas by the piston is 10^4J.What is the gas pressure during the compression?
*Tuesday, November 11, 2014 at 6:24am*

**physics**

A gas molecule at the surface of the earth happens to have the root mean square speed (rms)for that gas at 0°C.lf it were to go straight up without colliding with other molecules.How high would it rise and what would happen to the maximum height reached if a gas with ...
*Tuesday, November 11, 2014 at 5:59am*

**physics**

One mole of an ideal gas occupies a volume of 3.5×10^-2m^3 and exerts a pressure of 3atm on the walls of its container.Find average translatoinal kinetic energy per molecule and the absolute temperature of the gas? K avg=(3/2)kT
*Tuesday, November 11, 2014 at 4:42am*

**physics**

the ray of son strike the surfaces of a lake at an angle of incidence of 30°.find the angle through which the rays are deviated when they enter water of refrective index 1.33.
*Tuesday, November 11, 2014 at 1:09am*

**Physics**

Matthew is spelunking when he loses his rope. John lowers a rope down to him, a distance of 40m. If Matthew has a mass of 50kg, and the rope can withstand a maximum force of 547N without breaking, what is the minimum amount of time it will take to pull Matthew out of the cave??
*Tuesday, November 11, 2014 at 12:42am*

**physics**

Mia is on a planet where g=10 m/s^2. she is standing on a bathroom scale in an elevator. the scale reads 500N. the elevator accelerates upward with an acceleration of 5.0m/s^2 what would the scale read now
*Tuesday, November 11, 2014 at 12:26am*

**Physics**

A primitive diving bell consists of a cylindrical tank with one end open and one end closed. The tank is lowered into a freshwater lake, open end downward. Water rises into the tank, compressing the trapped air, whose temperature remains constant during the descent. The tank ...
*Tuesday, November 11, 2014 at 12:08am*

**physics**

A car constantly accelerates at a rate of 4.8 m/s2 along a flat, straight road. If the car has traveled 122.1 meters, how fast is the car going?
*Monday, November 10, 2014 at 8:50pm*

**physics**

Bob fires a cannon horizontally off a 125 meter cliff.the cannonball leaves the cannon traveling at 144 meters per second. How far from the cliff will the cannonball land?
*Monday, November 10, 2014 at 8:44pm*

**Physics **

A playground merry-go-round of radius R = 2.15 m has a moment of inertia of I = 256 kg * m2 and is rotating at 10.9 revolutions/min about a frictionless vertical axle. Facing the axle, a 29.6 kg child hops onto the merry-go-round and manages to sit down on its edge. What is ...
*Monday, November 10, 2014 at 7:36pm*

**physics**

A hungry bear weighing 720 N walks out on a beam in an attempt to retrieve a basket of goodies hanging at the end of the beam (see the figure below). The beam is uniform, weighs 200 N, and is 7.00 m long, and it is supported by a wire at an angle of θ = 60.0°. The ...
*Monday, November 10, 2014 at 3:54pm*

**Physics**

An green hoop with mass mh = 2.4 kg and radius Rh = 0.14 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.2 kg and radius Rd = 0.1 m. The other end of the string is attached to a massless axel through the center of an orange sphere on a flat ...
*Monday, November 10, 2014 at 3:10pm*

**physics**

A Hot Wheels car of mass 0.081 kg starts at a height of 1.42 m and goes through a loop with a height of 0.38 m with a radius of 0.16 m along a track of length 3.02 m. The car barely makes it through the loop. Since, Work = Force x distance, what is the force of friction acting...
*Monday, November 10, 2014 at 2:53pm*

**Physics **

A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.650. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip relative to the 12.0-kg ...
*Monday, November 10, 2014 at 2:30pm*

**physics**

An object is formed by attaching a uniform, thin rod with a mass of mr = 6.54 kg and length L = 5.12 m to a uniform sphere with mass ms = 32.7 kg and radius R = 1.28 m. Note ms = 5mr and L = 4R. 1)What is the moment of inertia of the object about an axis at the left end of the...
*Monday, November 10, 2014 at 2:12pm*

**Physics**

A uniform disk with mass m = 8.54 kg and radius R = 1.35 m lies in the x-y plane and centered at the origin. Three forces act in the +y-direction on the disk: 1) a force 333 N at the edge of the disk on the +x-axis, 2) a force 333 N at the edge of the disk on the –y-axis...
*Monday, November 10, 2014 at 1:47pm*

**Physics**

A space vehicle is orbiting Earth in a circular orbit with a radius of 10,300,000m. What is the minimum increase in speed that is needed for the vehicle to escape Earth's gravitational field? The mass of the Earth is 5.97x10^24 kg and G = 6.67x10^-11 N*m^2/kg^2. The answer...
*Monday, November 10, 2014 at 10:38am*

**Physics**

A mass of 100g is attached to one end of a massless rod, 10cm in length, which is pivoted about the opposite end. The rod is held vertical, with the mass at the top, and released. The rod swings. A. What is the speed of the mass at the instant that the rod is horizontal? B. ...
*Monday, November 10, 2014 at 10:34am*

**physics**

A car is traveling at 58.2 km/h on a ﬂat highway. The acceleration of gravity is 9.8 m/s2 . If the coeﬃcient of friction between the road and the tires on a rainy day is 0.155, what is the minimum distance in which the car will stop?
*Monday, November 10, 2014 at 8:32am*

**PHYSICS**

Calculate the work done against external atmospheric pressure when 1 g of water changes to 1672cm3 of steam. Take the atmospheric pressure as 1.013×105Nm−2
*Monday, November 10, 2014 at 4:53am*

**physics**

A target lies flat on the ground 4 m from the side of a building that is 10 m tall, as shown below. The acceleration of gravity is 10 m/s2 . Air resistance is negligible. A student rolls a 4 kg ball off the horizontal roof of the building in the direction of the target.
*Sunday, November 9, 2014 at 11:41pm*

**Physics**

A moving 4.5 kg block collides with a horizontal spring whose spring constant is 226 N/m (see figure). The block compresses the spring a maximum distance of 8.0 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.47...
*Sunday, November 9, 2014 at 11:08pm*

**physics**

A ball is kicked at a 45* angle over a 6 ft fence 20 m away at 17 m/s. How far above the fence will the ball pass? No air resistance
*Sunday, November 9, 2014 at 10:50pm*

**physics**

During a baseball game, a batter hits a pop-up to a fielder 92m away. The acceleration is 9.8 m/s^2. If the ball remains in the air for 5.8 seconds, how high does it rise?
*Sunday, November 9, 2014 at 10:39pm*

**Physics**

A plate falls vertically to the floor and breaks up into three pieces, which slide along the floor. Immediately after the impact, a 200g piece moves along the x-axis with a speed of 2.00m/s and a 235g piece moves along the the y axis with a speed of 1.50m/s. The third piece ...
*Sunday, November 9, 2014 at 9:21pm*

**Physics**

A wire is made by attaching two segments together, end to end. One segment is made of aluminum and the other is steel. The effective coefficient of linear expansion of the two-segment wire is 19.0 x 10-6 (C°)-1. What fraction of the length is aluminum?
*Sunday, November 9, 2014 at 9:18pm*

**physics**

A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy 1.80x10^-21J. What angle ...
*Sunday, November 9, 2014 at 9:12pm*

**Physics**

A 4 kg mass and a 9 kg mass are being held at rest against a compressed spring on a frictionless surface. When the masses are released, the 4 kg mass moves to the east with a speed of 2m/s. What is the velocity of the 9 kg after the are released?
*Sunday, November 9, 2014 at 9:03pm*

**Check my physics answer**

When should you express a vector along the x-axis as a negative vector? when its magnitude is less than 1 when the arrow representing the vector would point toward negative x when the arrow representing the vector would point toward positive x when its magnitude is greater ...
*Sunday, November 9, 2014 at 8:37pm*

**physics**

A cricket pitch roller of diameter 1.5 m has a mass of 450 kg; it is pulled by a handle attached to its centre. Find the minimum force to pull up a step which is 250 mm high if the roller handle makes an angle of 30o with the horizontal.
*Sunday, November 9, 2014 at 8:09pm*

**physics**

A 7.75 kg(75.95 N)box is placed on a 29.7° incline on top of a lab table. The ramp is 3.11 m long, at the bottom of the incline the box slides horizontally for a short distance before rolling off the lab table. If the table is 0.84 m high, find how far from the table the ...
*Sunday, November 9, 2014 at 8:05pm*

**Can you check my answer - Physics**

A balloonist drops an apple weighing 1.5 N over the side of the balloon's gondola. As it falls and increases speed, the drag force from the air upward on it increases. When the upward force is 0.7 N, what is the direction and magnitude of the net force on the apple? 9.8 N ...
*Sunday, November 9, 2014 at 7:53pm*

**physics**

A plane cruising along at 268 m/s, in straight level flight wants to drops a bomb. He is at a height of 1000m. At what distance should the pilot release the bomb in order to hit his target?
*Sunday, November 9, 2014 at 7:18pm*

**Physics**

A steel ruler is calibrated to read true at 21.6 °C. A draftsman uses the ruler at 44.5 °C to draw a line on a 44.5 °C copper plate. As indicated on the warm ruler, the length of the line is 0.314 m. To what temperature should the plate be cooled, such that the ...
*Sunday, November 9, 2014 at 7:07pm*

**Physics**

A 0.422-kg ball with a speed of 1.31 m/s rolls across a level surface toward an open 0.348-kg box that is resting on its side. The ball enters the box, and the box (with the ball inside it) then slides across the surface a distance of 0.473 m. What is the coefficient of ...
*Sunday, November 9, 2014 at 6:48pm*

**Physics**

A 18 g bullet is fired into the bob of a ballistic pendulum of mass 1.4 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet.
*Sunday, November 9, 2014 at 6:36pm*

**Physics**

A 0.9-kg block (mass m) and a second block (mass M) are both initially at rest on a frictionless inclined plane. Mass M rests against a spring that has a force constant of 12.2 kN/m. The distance d along the plane between the two blocks is 3.64 m. The 0.9-kg block is released...
*Sunday, November 9, 2014 at 6:31pm*

**Physics**

Traveling at a speed of 22m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of friction between the tires and the road is 0.68. How much time does it take for the car to come to a halt? As usual, ignore the effects of air ...
*Sunday, November 9, 2014 at 6:12pm*

**Physics**

Two masses ( 2.3 kg and 4.2 kg) connected by a massless rope hung over opposite ends of a frictionless pulley. Each mass is initially 1.50 m above the ground, and the top of the pulley is 6.5 m above the ground. What maximum height does the lighter object reach after the ...
*Sunday, November 9, 2014 at 6:07pm*

**physics**

A 65 kg water skier is pulled up a 15° inclined by a role parallel to the incline with a tension of 500N. The coefficient of kinetic friction is .25. What are the magnitude and direction of the skier's acceleration? I found the weight its 637.65 I found it by ...
*Sunday, November 9, 2014 at 6:04pm*

**Physics**

A person weighs 150 pounds. He is standing on a scale in an elevator and stands on a scale. The elevator is accelerating upwards at a rate of 10 m/s/s, what is the reading of the scale? 150 pounds about 75 pounds about 300 pounds not enough info
*Sunday, November 9, 2014 at 5:59pm*

**Physics**

The best time to dig clams is when the low ocean tide is lowest (when you have the lowest possible tides). This occurs when the moon is full half full moon quater moon actually all low tides are about the same
*Sunday, November 9, 2014 at 5:25pm*

**Physics**

A person weighs 150 pounds. He is standing on a scale inside an elevator. If the elevator is free-falling downward (perhaps the cable broke), what is the reading of the scale? 150 pounds about 25 pounds 0 pounds not enough info
*Sunday, November 9, 2014 at 5:24pm*

**physics **

A mechanic jacks up a car to an angle of 10◦ with the horizontal in order to change the front tires. The car is 2.78 m long and has a mass of 1110 kg. Its center of mass is located 1.15 m from the front end. The rear wheels are 0.25 m from the back end. around the back ...
*Sunday, November 9, 2014 at 4:55pm*

**physics **

As part of a kinetic sculpture, a 5.6 kg hoop with a radius of 3.8 m rolls without slipping. If the hoop is given an angular speed of 2.1 rad/s while rolling on the horizontal and then rolls up a ramp inclined at 17.7◦ with the horizontal, how far does the hoop roll ...
*Sunday, November 9, 2014 at 4:54pm*

**Physics**

Two objects are moving in the xy-plane. No external forces are acting on the objects. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. Some time later, object A is...
*Sunday, November 9, 2014 at 4:33pm*

**Physics**

Two objects are moving in the xy-plane. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. What is the total momentum of the system? (should I use dot product here?)
*Sunday, November 9, 2014 at 4:28pm*

**Physics**

An interacting system of two objects has no external force acting on the system. The first has a mass of 2.00kg and is moving with a velocity (2.00m/s)i + (1.00m/s)j at time t=0s. The second object has a mass of 3.00kg and is moving with a velocity (-1.00m/s)i + (1.00m/s)j at ...
*Sunday, November 9, 2014 at 4:22pm*

**physics **

A mechanic jacks up a car to an angle of 10◦ with the horizontal in order to change the front tires. The car is 2.78 m long and has a mass of 1110 kg. Its center of mass is located 1.15 m from the front end. The rear wheels are 0.25 m from the back end. around the back ...
*Sunday, November 9, 2014 at 4:17pm*

**Physics**

A simple pendulum of length 2.00m is made with a mass of 2.00kg. The mass has speed of 3.00 m/s when the pendulum is 30 degrees above its lowest position. -What is the maximum angle away from the lowest position the pendulum will reach? -What is the speed of the mass when the ...
*Sunday, November 9, 2014 at 4:15pm*

**Physics**

A mass of 2.0kg traveling at 3.0 m/s along a horizontal plane hits a relaxed spring 20cm away from it. The coefficient of kinetic friction is 0.3. The mass is slowed to zero velocity when the spring has been compressed. By how much the spring has been compressed, the spring ...
*Sunday, November 9, 2014 at 4:14pm*

**Physics**

A car of mass 900 kg pulls a caravan of mass 400 kg along a straight horizontal road with an acceleration of 2 ms-2. Assuming that the frictional forces are negligible, the tension in the coupling between the car and caravan is
*Sunday, November 9, 2014 at 3:46pm*

**physics**

An empty 160 kg elevator accelerates upward at 1.2 m/s 2 . The acceleration of gravity is 9.8 m/s 2 . What is the tension in the cable that lifts the elevator cab? Answer in units of N
*Sunday, November 9, 2014 at 2:49pm*

**Physics**

A dynamics cart with a mass of 1.70kg on a horizontal table is attached to a suspended mass of 0.40kg and released from rest. If a frictional of 2.0N opposes the motion of the cart how far does the cart travel in 1.5s
*Sunday, November 9, 2014 at 12:51pm*

**physics 1**

A 8.00-kg block of ice, released from rest at the top of a 1.44-m-long frictionless ramp, slides downhill, reaching a speed of 2.54m/s at the bottom.
*Sunday, November 9, 2014 at 12:43pm*

**physics**

A 40kg box of sweet cherries at 10 ° c cosisting of 30kg water and 10kg cherries is to be frozen at -30°c.Calculate the total amount of heat that needsto be removed from the cherries . The specific heat capacity of cherries is 3.43kj /kg°c. The specific ccapacity ...
*Sunday, November 9, 2014 at 12:15pm*

**physics**

A 40kg box of sweet cherries at 10 ° c cosisting of 30kg water and 10kg cherries is to be frozen at -30°c.Calculate the total amount of heat that needsto be removed from the cherries . The specific heat capacity of cherries is 3.43kj /kg°c. The specific ccapacity ...
*Sunday, November 9, 2014 at 12:03pm*

**physics**

The latent heat of fusion for metal is 246kj per kg. How much heat would be used by melting 10 tonnes of metal?
*Sunday, November 9, 2014 at 12:00pm*

**physics**

A coolant fluid has a latent heat of evaporation of 234 kj/kg . If the pump rate is 2250g per minute. How much thermal heat is removed each hour?
*Sunday, November 9, 2014 at 11:59am*

**physics**

A child is standing on a platform of a station. A train travelling at 30m/s takes 3.0 secs to pass the child.What is the length of the train. a)10m-this was my answer b)27m c)30m d)90m
*Sunday, November 9, 2014 at 11:38am*

**Physics**

A box weighing 178N slides down a ramp with an initial velocity of 0.5m/s^2. The ramp has an angle of 24 degrees and is 3m long. What is the acceleration of the box? I know that F=ma but how do I find a?
*Sunday, November 9, 2014 at 10:44am*

**physics**

An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 24.5°C (297.65 K). Suppose the engine generates 11.5 hp (8.58 kW) of power and, due to ...
*Sunday, November 9, 2014 at 9:21am*

**Physics**

calculate the component of a force of 200n at a direction of 60 to the force.
*Sunday, November 9, 2014 at 8:02am*

**physics**

A jet plane is flying with a constant speed along a straight line, at an angle of 25.5° above the horizontal, as Figure 4.30a indicates. The plane has weight vector W whose magnitude is 86500 N, and its engines provide a forward thrust vector T of 103000 N. In addition, ...
*Saturday, November 8, 2014 at 11:50pm*

**Physics**

A 24.00 kg block at rest on a horizontal frictionless air track is connected to the wall via a spring. The equilibrium position of the mass is defined to be at x=0. Somebody pushes the mass to the position x=0.3500 m, then lets it go. The mass undergoes simple harmonic motion ...
*Saturday, November 8, 2014 at 11:42pm*

**Physics with Calculus**

The system shown in the figure is in static equilibrium. The rod of length L and mass M is held in an unpright position. The top of the rod is tied to a fixed vertical surface by a string, and a force F is applied at the midpoint of the rod. The coefficient of static friction ...
*Saturday, November 8, 2014 at 10:45pm*

**physics**

A 2.7 kg object falls from a tower. It experiences 2.3 N of air resistance. What is the acceleration?
*Saturday, November 8, 2014 at 10:30pm*

**Physics test review**

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 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 ...
*Saturday, November 8, 2014 at 9:37pm*

**Physics**

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 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
*Saturday, November 8, 2014 at 9:32pm*

**Physics**

A 4.80kg cat leaps from the floor to the top of a 94.0-cm-high table. If the cat pushes against the floor for 0.230s to accomplish this feat, what was her average power output in hp during the pushoff period?
*Saturday, November 8, 2014 at 8:53pm*

**Physics**

A small sphere of mass 2 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the lowest point of the trajectory if the speed at this point is 7m/s. Use g=9.8 m/s2.
*Saturday, November 8, 2014 at 8:01pm*

**Physics**

A small sphere of mass 1 kg is attached to the end of a cord of length 1 m and rotated in a vertical circle about a fixed point O. If the speed at the uppermost point of the trajectory is 1 m/s, the sphere will have a circular trajectory (will move in a circle). Use g=9.8 m/s2.
*Saturday, November 8, 2014 at 8:00pm*

**Physics**

A small sphere of mass 3 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the uppermost point of the trajectory if the speed at this point is 8m/s. Use g=9.8 m/s2.
*Saturday, November 8, 2014 at 8:00pm*

**Physics**

A 1550 -kg car moves on a horizontal curved road. If the radius of the curve is 46 m and the coefficient of friction between the tires and road is 0.1, find the maximum speed the car can have so that it may not skid.
*Saturday, November 8, 2014 at 7:59pm*

**Physics**

A coin is placed on a large disk which rotates uniformly at a rate of 2 rot/s. The coefficient of friction between the coin and the disk is 0.1. To what distance from the center of the disk should the coin be placed so that the coin may not slip? I know that mu times g (.1 x 9...
*Saturday, November 8, 2014 at 7:57pm*

**Physics**

The spring shown in the figure is compressed 59cm and used to launch a 100 kg physics student. The track is frictionless until it starts up the incline. The student's coefficient of kinetic friction on the 30∘ incline is 0.14 . k= 80,000 N/m m=100 kg uk= .14 DeltaX= ...
*Saturday, November 8, 2014 at 7:40pm*

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