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November 22, 2014

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Recent Homework Questions About Physics

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univ. physics
A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal)
Thursday, December 13, 2012 at 5:21pm

physics
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.100 . Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
Thursday, December 13, 2012 at 1:51pm

Physics
A sound wave is traveling in warm air when it hits a layer of cold, dense air. If the sound wave hits the cold air interface at an angle of 23 degree angle, what is the angle of refraction? Assume that the cold air temperature is -10 degrees C and the warm air temperature is +...
Thursday, December 13, 2012 at 12:28pm

physics
A particular guitar string is supposed to vibrate at 210Hz , but it is measured to vibrate at 220Hz By what percent should the tension in the string be changed to correct the frequency?
Thursday, December 13, 2012 at 12:24pm

Physics
a bike passes a lamp post at the crest of hill at 4.5 m/s. she accelerates down the hill at the rate of 0.04 m/s squared for 12 seconds. how far does she move down the hill during this time ?
Thursday, December 13, 2012 at 10:53am

Physics
a hockey player accelerates a puck (m=.167 kg) from rest to a velocity of 50 m/s in 0.0121 sec. Determine the acceleration of the p7uck and the force applied by the hockey stick to the puck. Neglect resistance forces.
Thursday, December 13, 2012 at 10:52am

physics
Two particles are fixed on an x axis. Particle 1 of charge 47.9 μC is located at x = -5.87 cm; particle 2 of charge Q is located at x = 32.3 cm. Particle 3 of charge magnitude 52.8 μC is released from rest on the y axis at y = 15.1 cm. What is the value of Q if the ...
Thursday, December 13, 2012 at 10:47am

physics
Imagine that a new asteroid is discovered in the solar system with a circular orbit and an orbital period of 7 years. What is the average distance of this object from the Sun in Earth units?
Thursday, December 13, 2012 at 2:30am

physics
A baby sitter pushing a stroller starts from rest and accelerates uniformly at a rate of 0.770 m/s 2 . What is the velocity of the stroller after it has traveled 5.94 m? Answer in units of m/s
Thursday, December 13, 2012 at 2:28am

physics
A certain car is capable of accelerating at a uniform rate of 0.84 m/s 2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 84 km/h to one of 97 km/h? Answer in units of m
Thursday, December 13, 2012 at 2:18am

physics
10 people,each of mass 70 kg, stand on a boat with a mass of 1000 kg. they jump off one end of the boat with velocity 1 m/s relative to the boat. the boat rolls in the opposite direction without friction. a what is the final velocity of the boat if all the people jump at the ...
Thursday, December 13, 2012 at 12:00am

physics
The flywheel of an engine has a moment of inertia of 24 kg*m^2. a) if the radius of the wheel is 0.6m, what force is required to accelerate the wheel from rest to an angular velocity of 300 rpm in 6 seconds? b) how many turns does it make during this time?
Wednesday, December 12, 2012 at 11:57pm

physics
The flywheel of an engine has a moment of inertia of 24 kg*m^2. a) if the radius of the wheel is 0.6m, what force is required to accelerate the wheel from rest to an angular velocity of 300 rpm in 6 seconds? b) how many turns does it make during this time?
Wednesday, December 12, 2012 at 11:57pm

Physics please help me
Two identical guitar strings are stretched with the same tension between supports that are not the same distance apart. The fundamental frequency of the higher-pitched string is 400Hz, and the speed of transverse waves in both wires is 200 m/s. How much longer is the lower-...
Wednesday, December 12, 2012 at 11:36pm

Physics
There are two polarizing filters that are out of alignment by 30 degrees. If the light of intensity 1.00 W/m^2 and initially polarized half-way between the two filters passes through the two filters, what is the intensity of the transmitted light? I know the answer is 0.700 W/...
Wednesday, December 12, 2012 at 11:12pm

Physics
A rain cloud contains 2.72 × 10^7 kg of water vapor. The acceleration of gravity is 9.81 m/s^2. How long would it take for a 3.79 kW pump to raise the same amount of water to the cloud’s altitude of 1.85 km? Answer in units of s
Wednesday, December 12, 2012 at 11:11pm

physics
how tall must a water filled manometer be to measure blood pressure as high as 300 mm Hg? what do i use for pressure, density and height?
Wednesday, December 12, 2012 at 11:09pm

physics
what is meant by isolatedsystem?
Wednesday, December 12, 2012 at 10:54pm

Physics
A 4.2 × 10^3 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 18.4◦ with the horizontal. An average frictional force of 4.1×10^3 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4...
Wednesday, December 12, 2012 at 10:11pm

physics..please help me due in a couple of mins.!!
Two identical guitar strings are stretched with the same tension between supports that are not the same distance apart. The fundamental frequency of the higher-pitched string is 400Hz, and the speed of transverse waves in both wires is 200 m/s. How much longer is the lower-...
Wednesday, December 12, 2012 at 9:50pm

Physics
What is the net vertical force on this balloon if it is let go? Mass of the rubber 1.50g. Ignore the volume of rubber
Wednesday, December 12, 2012 at 9:32pm

Physics
What is the net vertical force on this balloon if it is let go? The mass of the rubber in the balloon is 1.50g. Ignore the volume of rubber.
Wednesday, December 12, 2012 at 9:30pm

Physics
How much work must be done to increase the speed of an electron (a) from 0.18c to 0.19c and (b) from 0.98c to 0.99c? Note that the speed increase is 0.01c in both cases.
Wednesday, December 12, 2012 at 9:30pm

physics
a boat of mass 90 kg is floating in still water a body of mass 30 kg walks from the stern to the boat the length of the boat is 3m. calculate the distance through which the boat move.
Wednesday, December 12, 2012 at 9:26pm

physics
A stone is thrown upward with a speed of 20 m/s. It is caught on its way down at a point 5.0 m above where it is thrown. A) How fast was it going when it was caught? B) how long did the trip take?
Wednesday, December 12, 2012 at 8:30pm

Physics
A motorist travels 1600 m at 80 m/s and 750 m at 100 m/s. What is the average speed of the motorist for this trip.
Wednesday, December 12, 2012 at 8:20pm

Physics HW ...HELP!!
Two identical guitar strings are stretched with the same tension between supports that are not the same distance apart. The fundamental frequency of the higher-pitched string is 400Hz, and the speed of transverse waves in both wires is 200 m/s. How much longer is the lower-...
Wednesday, December 12, 2012 at 7:59pm

Physics
What is the momentum of a two-particle system composed of a 1400 kg car moving east at 90 m/s and a second 900 kg car moving west at 95 m/s? Let east be the positive direction.
Wednesday, December 12, 2012 at 7:50pm

physics
A 6.1 kg bowling ball is lifted 2.4 m into a storage rack. The acceleration of gravity is 9.8 m/s 2 . Calculate the increase in the ball’s potential energy. Answer in units of J
Wednesday, December 12, 2012 at 7:43pm

Physics
When a load of 0.97 106 N is placed on a battleship, the ship sinks only 3.0 cm in the water. Estimate the cross-sectional area of the ship at water level. (The density of sea water is 1.025 103 kg/m3.)
Wednesday, December 12, 2012 at 7:10pm

Physics
A pipe contains water at 4.80 105 Pa above atmospheric pressure. If you patch a 3.55 mm diameter hole in the pipe with a piece of bubble gum, how much force must it be able to withstand?
Wednesday, December 12, 2012 at 7:10pm

Physics
A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 554 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of the rope are not the ...
Wednesday, December 12, 2012 at 6:05pm

physics
A woman stands on a scale in a moving elevator. Her mass is 69.1 kg, and the combined mass of the elevator and scale is an additional 734 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9430 N. What does ...
Wednesday, December 12, 2012 at 6:04pm

Physics
A rocket blasts off from rest and attains a speed of 42.2 m/s in 10.9 s. An astronaut has a mass of 63.8 kg. What is the astronaut's apparent weight during takeoff?
Wednesday, December 12, 2012 at 6:04pm

Physics
A student is skateboarding down a ramp that is 8.81 m long and inclined at 27.3 ° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 2.58 m/s. Neglect friction and find the speed at the bottom of the ramp.
Wednesday, December 12, 2012 at 6:03pm

Physics
A car (m = 1510 kg) is parked on a road that rises 12.6 ° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires?
Wednesday, December 12, 2012 at 6:03pm

Physics
Chapter 4, Problem 36 Incorrect. A 77.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.66 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an ...
Wednesday, December 12, 2012 at 6:02pm

physics
A neutron star has a mass of 1.27 × 1030 kg (about the mass of our sun) and a radius of 6.47 × 103 m. Suppose an object falls from rest near the surface of such a star. How fast would it be moving after it had fallen a distance of 0.0086 m? (Assume that the ...
Wednesday, December 12, 2012 at 5:50pm

Physics
(a) Calculate the magnitude of the gravitational force exerted on a 430-kg satellite that is a distance of 2.81 times earth radii from the center of the earth. (b) What is the magnitude of the gravitational force exerted on the earth by the satellite? (c) Determine the ...
Wednesday, December 12, 2012 at 4:51pm

Physics
A capacitor has a capacitance of 55 pF. In the charging process electrons are removed from one ate and placed on the other plate. When the potential difference between the plates is 5.3 v how many electrons have been transferred?
Wednesday, December 12, 2012 at 4:41pm

Physics
An organ pipe open at one end has a length of 60 cm. If the speed of sound in air is 340 m/s, what is the lowest frequency produced by the organ pipe? A) 141.5 Hz B) 283 Hz C) 70.8 Hz D) 610 Hz E) 305 Hz
Wednesday, December 12, 2012 at 3:14pm

physics
the magnification caused by a convex lens is represented by Hi/Ho, where hi is the height of the image and ho is the height of the object. Using that ratio, show that the magnification caused by a convex lens is equal to di/do(ratio of the image distance to the object distance.
Wednesday, December 12, 2012 at 1:06pm

physics
Haloke does 179 J of work lifting himself 0.296 m. What is Haloke's mass?
Wednesday, December 12, 2012 at 1:00pm

physics
An object is placed 3cm in front of a diverging lens of focal length of 6cm. the heihgt of the object is 1.5 cm. calculate the image distance and height
Wednesday, December 12, 2012 at 11:52am

college physics
You are on a ladder painting your house. You accidentally drop a bucket of paint weighing 10lb from a height of 17ft. With what speed do the paint and bucket hit the rose bushes below? Would it be different if you dropped your paintbrush weighing 1/2 lb instead? b) what color ...
Wednesday, December 12, 2012 at 11:48am

Physics
If you throw a ball straight upward at a speed of 24 m/s, how long will it take to reach zero speed? How long will it take to return to its starting point? How fast will it be going when it returns to its starting point?
Wednesday, December 12, 2012 at 11:41am

Physics
A long wire carries a current of 20 A along the directed axis of a long solenoid. The field due to the solenoid is 4 mT. Find the field at a point 3 mm from the solenoid axis.
Wednesday, December 12, 2012 at 10:25am

Physics
A long wire carries a current of 20 A along the directed axis of a long solenoid. The field due to the solenoid is 4 mT. Find the field at a point 3 mm from the solenoid axis.
Wednesday, December 12, 2012 at 10:25am

physics
It takes 2.5 J of energy to stretch a helical spring by 15 cm. Determine the spring constant.
Wednesday, December 12, 2012 at 8:53am

physics
A rod of length L = 1.2 m pivots freely about one end. The rod is held horizontally and released, with no intial velocity. Find the angular velocity of the rod as it passes through the vertical orientation. (Use conservation of energy. The rotational inertia of a rod like this...
Wednesday, December 12, 2012 at 1:37am

physics
calculate the value of g at a height of 3600 km above the surface of the earth?
Wednesday, December 12, 2012 at 12:39am

Physics
Rather than taking the stairs, Javier gets from the second floor of his house to the first floor by sliding down the banister that is inclined at an angle of 30.0 degrees to the horizontal. If Javier has a mass of 49.1 kg and the coefficient of kinetic friction between Javier ...
Tuesday, December 11, 2012 at 11:52pm

Physics
A server at a diner slides a 0.521 kg root beer from the end of the counter to a thirsty customer. A force of friction of 1.32 N brings the drink to a stop right in front of the customer. What is the coefficient of kinetic friction between the glass and the counter?
Tuesday, December 11, 2012 at 11:25pm

physics
A small girl and boy take a sled up to the top of a snow covered slope which is inclined 30 degrees above the horizontal. The girl, boy and the sled have a mass of 160 kg. The coefficient of static friction is 0.28 and the coefficient of kinetic friction is 0.14 between the ...
Tuesday, December 11, 2012 at 11:02pm

physics
A small girl and boy take a sled up to the top of a snow covered slope which is inclined 30 degrees above the horizontal. The girl, boy and the sled have a mass of 160 kg. The coefficient of static friction is 0.28 and the coefficient of kinetic friction is 0.14 between the ...
Tuesday, December 11, 2012 at 11:02pm

physics
A large water tank is 18m above the ground. Suppose a pipe with a diameter of 8cm is connected to the tank and leads down to the ground. How fast does the water rush of the piper at ground level? Assume that the tank is open to the atmosphere.
Tuesday, December 11, 2012 at 10:04pm

physics
In another solar system, a 100,000 kg spaceship and a 200,000 kg spaceship are connected by a motionless 90 m long tunnel. The rockets start their engines at the same time, and each produces 50,000 N of thrust in opposing directions. What is the system's angular velocity ...
Tuesday, December 11, 2012 at 9:04pm

physics
A plank with m=0.12 kg and 50cm long has one mass of m1=0.11kg sitting on one end and a m2=0.055kg at the other end. Where should the pivot point be to balance the plank?
Tuesday, December 11, 2012 at 8:07pm

physics
suppose that a seat-belted mother riding in an automobile holds a 10 kg baby in her arms. the automobile crashes and decelerates from 50km/h to 0 in .1 s. what average force would the mother have to exert on the baby to hold it?? do you think she can do this?
Tuesday, December 11, 2012 at 8:05pm

physics
suppose that a seat-belted mother riding in an automobile holds a 10 kg baby in her arms. the automobile crashes and decelerates from 50km/h to 0 in .1 s. what average force would the mother have to exert on the baby to hold it?? do you think she can do this?
Tuesday, December 11, 2012 at 8:05pm

physics
A rule of thumb for automobile collisions against a rigid barrier is that the collision lasts about .11 seconds, for any initial speed and for any model of automobile. accordingly, the deceleration experienced by an automobile during a collision is directly proportional to the...
Tuesday, December 11, 2012 at 8:03pm

college physics
a large cuckoo clock has a pendulum with a period of 1.0 sec. The clock loses 10 min a day. how would you fix it? (Hint: change l) a. Find the length l of the pendulum. b. How much adjustment in l, up or down, is needed?
Tuesday, December 11, 2012 at 7:51pm

PHYSICS
If it take a force of 10,000N to accelerate a car with a mass of 1250KG at a rate of 6m/s^2, what is the force of friction acting against the car?
Tuesday, December 11, 2012 at 7:51pm

PHYSICS
how far will a 1000kg car travel in 10 sec if it is accelerated from rest by a force of 5000N
Tuesday, December 11, 2012 at 7:50pm

Physics
Suppose you put a 100 W light bulb in a container of water and use it to heat the water. How long would it take to raise the temperature of a gallon of water at 25 C to 90C? Please explain!
Tuesday, December 11, 2012 at 7:49pm

Physics
You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
Tuesday, December 11, 2012 at 7:47pm

Physics
You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
Tuesday, December 11, 2012 at 7:46pm

Physics
A bubble of air, 0.010 m^3 in volume, is formed at the bottom of a lake which is 30.0 m deep and where the temperature is 8.0 C. The bubble rises to the surface, where the water temperature is 26 C and where the pressure is atmospheric pressure. What is the volume of the ...
Tuesday, December 11, 2012 at 7:18pm

Physics
A 3 m long lever is used to lift a mass of 500 kg. If a force of 200 N is to be used to life the mass, then how far from the mass should the fulcrum be placed? Assume the mass and the force act at the ends of the lever.
Tuesday, December 11, 2012 at 6:37pm

Physics
A 3 m long lever is used to lift a mass of 500 kg. If a force of 200 N is to be used to life the mass, then how far from the mass should the fulcrum be placed? Assume the mass and the force act at the ends of the lever.
Tuesday, December 11, 2012 at 6:37pm

AP Physics B
system consists of a steal beam of mass M 􏰀 68.4 kg and length L 􏰀 1.84 m, with a 39.0-kg brass sphere attached at the right end of the rod, as shown below. BA a. Determine the moment of inertia of the system for rotation about an axis through the center of ...
Tuesday, December 11, 2012 at 6:11pm

physics pencil torqu
A pencil, 15.7 cm long, is released from a vertical position with the eraser end resting on a table. The eraser does not slip. Treat the pencil like a uniform rod. What is the angular speed of the pencil just before it hits the table? What is the angular speed of the pencil ...
Tuesday, December 11, 2012 at 6:11pm

physics
An object is placed 3cm in front of a diverging lens of focal length of 6cm. the heihgt of the object is 1.5 cm. calculate the image distance and height of the image
Tuesday, December 11, 2012 at 5:39pm

physics torque i think please help
Three joggers are running along straight lines as follows: Jogger A, with a mass of 55.2kg, is traveling along the line y=6.00m at 3.45 m/s in the positive x-direction. Jogger B, with a mass of 62.4kg, is traveling at 4.23 m/s along the line x=3.00m in the positive y-direction...
Tuesday, December 11, 2012 at 5:35pm

physics
A student librarian picks up a 2.2 kg book from the floor to a height of 1.05 m. He carries the book 8.3 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?
Tuesday, December 11, 2012 at 3:24pm

PHYSICS ~so confused~
so i'm going to try my hardest to type this out. which of the following system of forces provides the block the highest net force? a.) 11N--->[box]<---71N b.) 405N--->[box]<---403N c.) 227N--->[box]<---153N d.) 22.7N--->[box]<---15.3N I thought this...
Tuesday, December 11, 2012 at 3:23pm

physics
A lawn roller is pushed across a lawn by a force of 103 N along the direction of the handle, which is 22.5° above the horizontal. If 63.0 W of power is developed for 90.0 s, what distance is the roller pushed?
Tuesday, December 11, 2012 at 3:20pm

Physics
A solid block of water (m = 10 grams, Ti = -4 degrees Celsius) is shrink wrapped in an ultra thin super plastic (that has absolutely no effect on the interaction between its contents and the surrounding environment) and is placed as ammo inside a spring loaded cannon. The ...
Tuesday, December 11, 2012 at 2:58pm

Physics-please check my work
Can you check my work please? true/false 1.) force is a scalar quantity: *FALSE 2.) the object on which a force acts is called the system: *TRUE 3.)The specific, indentifiable cause of a force is called the system: *FALSE 4.) A force can not exist without an agent and a system...
Tuesday, December 11, 2012 at 2:57pm

Physics
At the bottom of an old mercury-in-glass thermometer is a 43-mm3 reservoir filled with mercury. When the thermometer was placed under your tongue, the warmed mercury would expand into a very narrow cylindrical channel, called a capillary, whose radius was 1.9 × 10-2 mm. ...
Tuesday, December 11, 2012 at 2:47pm

Physics
A weight is hung from the ceiling of an elevator by a massless string. under which circumstances will the tension in the cord be the greatest? smallest? a.) The elevator rises with decreasing speed b.) The elevator rises with increasing speed c.) The elevator is at rest d.) ...
Tuesday, December 11, 2012 at 2:42pm

physics
An object is placed 3cm in front of a diverging lens of focal length of 6cm. the heihgt of the object is 1.5 cm. calculate the image distance and height of the image.
Tuesday, December 11, 2012 at 1:05pm

physics
A hockey puck has a mass of 0.118 kg and is at rest. A hockey player makes a shot, exerting a constant force of 28.0 N on the puck for 0.16 s. With what speed does it head toward the goal?
Tuesday, December 11, 2012 at 12:57pm

physics
A person exerts a force of 6.0 N at a point which is 90 cm from the hinged side of a door. If the torque is 5.2 N m then determine the angle between the force vector and the line that runs directly from the point to the hinged side.
Tuesday, December 11, 2012 at 12:49pm

Physics
You are in a boat that is traveling across a river from east to west at 4.0 m/s. the river runs north at 3.0 m/s. what is the resultant velocity of the boat?
Tuesday, December 11, 2012 at 12:33pm

Physics
A skydiver deploys his parachute when he is 950m directly above his desired landing spot. He then falls through the air at a steady 5.0 m/s . There is a breeze blowing to the west at 1.1 m/s. At what angle with respect to vertical does he fall? By what distance will he miss ...
Tuesday, December 11, 2012 at 12:29pm

Physics
To help prevent frost damage, fruit growers sometimes protect their crop by spraying it with water when overnight temperatures are expected to go below the freezing mark. When the water turns to ice during the night, heat is released into the plants, thereby giving them a ...
Tuesday, December 11, 2012 at 11:09am

Physics
Multiple-Concept Example 11 deals with a situation that is similar, but not identical, to that here. When 4620 J of heat are added to a 0.194-m-long silver bar, its length increases by 6.14 x 10-3 m. What is the mass of the bar?
Tuesday, December 11, 2012 at 11:06am

Physics
At the bottom of an old mercury-in-glass thermometer is a 43-mm3 reservoir filled with mercury. When the thermometer was placed under your tongue, the warmed mercury would expand into a very narrow cylindrical channel, called a capillary, whose radius was 1.9 × 10-2 mm. ...
Tuesday, December 11, 2012 at 11:00am

Physics
On the moon the surface temperature ranges from 395 K during the day to 1.02 x 102 K at night. Convert these temperatures to the Celsius and Fahrenheit scales. (a) 395 K in degrees Celsius; (b) 395 K in degrees Fahrenheit; (c) 1.02 x 102 K in degrees Celsius; (d) 1.02 x 102 K ...
Tuesday, December 11, 2012 at 10:55am

Physics
Assuming the fluid has a density of 1.00 (g/cm^) at what height h should the bottle be placed so the liquid pressure is 38mm-Hg ? B.At what height h should the bottle be placed so the liquid pressure is 460mm-H_2O ? C.If the blood pressure is 18 {mm-Hg} above atmospheric ...
Tuesday, December 11, 2012 at 9:26am

Physics
Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 40m above that pipe. Pa?
Tuesday, December 11, 2012 at 9:21am

Physics
A 7.9cm diameter horizontal pipe gradually narrows to 5.9cm . When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 31.0kPa and 21.0kPa , respectively. What is the volume rate of flow? in m3/s please help!
Tuesday, December 11, 2012 at 9:01am

PHYSICS
What force must be exerted on the master cylinder of a hydraulic lift to support wt of a 2000 kg car resting on the slave cylinder? master : 2cm diameter,slave: 24cm diameter
Tuesday, December 11, 2012 at 5:11am

physics
what depth of mercury creates a pressure of 1 atm?
Tuesday, December 11, 2012 at 3:52am

physics
Can you find the pressure exerted on the floor by the heel if it has an are of 1.50 cm^2 and the woman's mass is 55kg?
Tuesday, December 11, 2012 at 3:13am

PHYSICS
How much would the rope stretch to break the climber's fall if he free falls 2m before the rope runs out of slack? k=1.40x10^4N//m mass of man= 90 kg I forgot how to use conservation of energy for this. I tried it, but I did it wrong.
Tuesday, December 11, 2012 at 3:10am

physics
a ball is thrown vertically upward at a speed of 45 m/s. how long does it take to return to the ground?
Tuesday, December 11, 2012 at 1:25am

physics
water is moving at a velocity of 2m/s through a hose with an internal diameter:1.60cm. What is the flow rate in liters per second?
Tuesday, December 11, 2012 at 12:54am

Physics
I'm also stumped by this one: 3. A bimetallic strip (117 cm by 1 cm by 0.01cm) has aluminum (a = 23x10^-6 1/Celsius) on one side and has steel (a= 12x10^-6 1/Celsius) on the other. It is perfectly straight at room temperature (20 celsius). What change in temperature is ...
Tuesday, December 11, 2012 at 12:24am

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